CN117590090B - Device, method and equipment for quickly confirming uniformity of electromagnetic reverberation room field - Google Patents
Device, method and equipment for quickly confirming uniformity of electromagnetic reverberation room field Download PDFInfo
- Publication number
- CN117590090B CN117590090B CN202410069897.7A CN202410069897A CN117590090B CN 117590090 B CN117590090 B CN 117590090B CN 202410069897 A CN202410069897 A CN 202410069897A CN 117590090 B CN117590090 B CN 117590090B
- Authority
- CN
- China
- Prior art keywords
- field
- uniformity
- electromagnetic reverberation
- parameters
- reverberation room
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 129
- 239000000523 sample Substances 0.000 claims abstract description 104
- 238000012790 confirmation Methods 0.000 claims abstract description 67
- 238000012360 testing method Methods 0.000 claims abstract description 53
- 238000003756 stirring Methods 0.000 claims abstract description 34
- 230000005684 electric field Effects 0.000 claims description 54
- 230000003287 optical effect Effects 0.000 claims description 53
- 230000008569 process Effects 0.000 claims description 33
- 238000006243 chemical reaction Methods 0.000 claims description 28
- 230000008878 coupling Effects 0.000 claims description 15
- 238000010168 coupling process Methods 0.000 claims description 15
- 238000005859 coupling reaction Methods 0.000 claims description 15
- 238000012937 correction Methods 0.000 claims description 13
- 238000004590 computer program Methods 0.000 claims description 11
- 238000004458 analytical method Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000005284 excitation Effects 0.000 claims description 4
- 238000012795 verification Methods 0.000 claims description 3
- 238000010408 sweeping Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 22
- 238000004364 calculation method Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000006872 improvement Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000010606 normalization Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000007123 defense Effects 0.000 description 2
- 238000010907 mechanical stirring Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000003012 network analysis Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0821—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning rooms and test sites therefor, e.g. anechoic chambers, open field sites or TEM cells
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0878—Sensors; antennas; probes; detectors
- G01R29/0885—Sensors; antennas; probes; detectors using optical probes, e.g. electro-optical, luminescent, glow discharge, or optical interferometers
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention provides a device, a method and equipment for quickly confirming the uniformity of an electromagnetic reverberation room field, and relates to the field of confirmation of the uniformity of the electromagnetic reverberation room field, wherein the method comprises the following steps: the three-dimensional photoelectric field probe is arranged at a fixed point position of an electromagnetic reverberation indoor working area, and the stirring paddle is rotated to any blade position; setting various parameters of a vector network analyzer; s of all frequency points of 3 orthogonal axes is measured by sequential sweep frequency 21 Parameters; rotating the stirring paddle to the next paddle position until the test of all paddle positions is traversed; setting the three-dimensional photoelectric field probe at the next fixed point position of the working area again until the test of all fixed point positions is completed; according to all S 21 Parameters and parameters of the three-dimensional photoelectric field probe determine normalized field intensity; and calculating the field uniformity of the electromagnetic reverberation chamber according to the normalized field intensity. The invention can shorten the time cost of full-frequency point field intensity measurement and improve the field uniformity confirmation efficiency.
Description
Technical Field
The invention relates to the field of electromagnetic reverberation room field uniformity confirmation, in particular to a device, a method and equipment for quickly confirming the electromagnetic reverberation room field uniformity.
Background
The electromagnetic reverberation chamber is typically a metallic shielded chamber containing mechanical stirring paddles that change the electromagnetic boundary conditions within the chamber by mechanical stirring, thereby creating a statistically uniform, isotropic field strength within a defined working area. The electromagnetic reverberation chamber has the characteristic of repeated reflection and superposition of electromagnetic waves, so that the electromagnetic reverberation chamber can be pushed to generate larger field intensity by using a smaller power amplifier. The advantages of uniform statistics of the field intensity of the reverberation room and the generation of large field intensity by the small power amplifier lead the reverberation room to be widely and deeply applied in the fields of national defense war industry, communication electronics, new energy automobiles and the like, in particular to the aspects of product EMC, over-the-air terminal OTA test and the like.
The application of the electromagnetic reverberant room was not separated from the confirmation of the electric field performance, the core parameter of the main confirmation was the field uniformity, and the limit value of the field uniformity confirmation was specified as shown in table 1.
Table 1 table of limits on reverberant room field uniformity
The traditional field uniformity confirmation method adopts a configuration mode of a signal source, a power amplifier and a field intensity probe (comprising a field intensity reading device), and adopts a point frequency setting and reading mode, which is very time-consuming. According to the basic configuration shown in fig. 1, 8 vertex positions, 20 blade positions, 1200 frequency points and 3-axis field intensity components of the working area are estimated according to the average reading of 0.5s of each field intensity component, and the traversing relation of the traditional field uniformity confirming method is shown in fig. 2, the total time required for completing such once field uniformity confirmation is as follows: t=8×20×1200×3×0.5s= 288000 s=80 h.
One field uniformity confirmation takes 80 hours, about 10 days; if factors such as placement, commissioning, etc. before testing of the reverberant room are taken into account, a test may take two weeks. Furthermore, typically field uniformity verification is not done only once, and the test needs to include at least two configurations as follows.
1) Cavity state: the electromagnetic reverberation chamber is emptied, various supports including test tables, test aids, etc. in the electromagnetic reverberation chamber are removed.
2) Maximum loading state: and installing and placing enough wave-absorbing materials in the electromagnetic reverberation chamber to simulate the extreme test loading condition.
If the field uniformity is confirmed twice as described above, it takes approximately 1 month. If it is involved to adjust the different working areas again, then more tests are required and the time costs are very high.
Disclosure of Invention
The invention aims to provide a device, a method and equipment for quickly confirming the field uniformity of an electromagnetic reverberation room, so as to solve the problems of high time cost and low field uniformity confirmation efficiency of the existing field uniformity confirmation mode.
In order to achieve the above object, the present invention provides the following.
An electromagnetic reverberation room field uniformity quick confirmation device, comprising: electromagnetic reverberation room, vector network analyzer and photoelectric conversion controller.
The port 1 of the vector network analyzer is connected with a transmitting antenna through a through-wall radio frequency cable of the electromagnetic reverberation chamber and is used for transmitting an excitation signal to the electromagnetic reverberation chamber through the transmitting antenna; and a port 2 of the vector network analyzer is connected with the photoelectric conversion controller and is used for receiving the radio frequency signals sent out by the photoelectric conversion controller.
The photoelectric conversion controller is connected with the three-dimensional optical electric field probe in the electromagnetic reverberation chamber and is used for converting an optical signal generated after the three-dimensional optical electric field probe senses an electric field into a radio frequency signal; the three-dimensional optical electric field probe is placed at a fixed point position of the electromagnetic reverberation indoor working area; the stirring paddles in the electromagnetic reverberation chamber are arranged in a non-working area, and the stirring paddles rotate to any blade position; the fixed point position is the vertex of the working area.
Determining normalized field intensity according to the transmitting power, the receiving power and various parameters of the three-dimensional optical electric field probe of the vector network analyzer; each parameter of the three-dimensional photoelectric field probe comprises an antenna coefficient of the three-dimensional photoelectric field probe and a correction coefficient of a controller channel of the three-dimensional photoelectric field probe; and calculating the field uniformity of the electromagnetic reverberation chamber according to the normalized field intensity.
Optionally, the method further comprises: a power amplifier and a directional coupler.
The port 1 of the vector network analyzer is connected with the input end of the power amplifier; the output end of the power amplifier is connected with the input end of the directional coupler; the coupling end of the directional coupler is connected with the port 3 of the vector network analyzer; the output end of the directional coupler is connected with a transmitting antenna through a through-wall radio frequency cable of the electromagnetic reverberation chamber.
A method for quickly confirming the uniformity of an electromagnetic reverberation room field comprises the following steps: and (3) a testing process for quickly confirming the uniformity of the electromagnetic reverberation room field and an analyzing process for quickly confirming the uniformity of the electromagnetic reverberation room field.
The testing process for quickly confirming the uniformity of the electromagnetic reverberation room field comprises the following steps: the three-dimensional photoelectric field probe is arranged at one fixed point position of an electromagnetic reverberation indoor working area, and the stirring paddle is rotated to any paddle position; the fixed point position is the vertex position of the working area.
Setting various parameters of a vector network analyzer; the parameters include bandwidth, number of scanning frequency points, transmitting power and intermediate frequency bandwidth.
Based on the scanning frequency points, S of all frequency points of 3 orthogonal axes of the three-dimensional optical electric field probe is sequentially measured in a sweep mode 21 Parameters; s is S 21 The parameters are determined from the transmit power of the transmit port of the vector network analyzer and the receive power of port 2 of the vector network analyzer.
And (3) rotating the stirring paddle to the next paddle position again until the test of all paddle positions of the stirring paddle at any certain position of the three-dimensional optical electric field probe is completed.
And setting the three-dimensional optical electric field probe at the next fixed point position of the working area again until the test of all fixed point positions is completed.
The analysis process for quickly confirming the uniformity of the electromagnetic reverberation room field comprises the following steps: acquiring various parameters of the three-dimensional photoelectric field probe, and acquiring all S in the test process according to the electromagnetic reverberation room field uniformity rapid confirmation 21 Parameters and parameters of the three-dimensional optical electric field probe determine normalized field intensity; and each parameter of the three-dimensional photoelectric field probe comprises an antenna coefficient of the three-dimensional photoelectric field probe and a correction coefficient of a controller channel of the three-dimensional photoelectric field probe.
And calculating the field uniformity of the electromagnetic reverberation chamber according to the normalized field intensity.
Optionally, S 21 The parameters are as follows:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>S corresponding to the kth blade position at the jth fixed point position in the ith orthogonal axis direction 21 Parameters; />The received power of the port 2 corresponding to the kth paddle position at the jth fixed point position in the ith orthogonal axis direction; />The transmission power of the port 1 corresponding to the kth paddle position at the jth fixed point position in the ith orthogonal axis direction.
Optionally, the normalized field strength is:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Normalized field strength; />Is the antenna coefficient; />Is a correction coefficient.
A method for quickly confirming the uniformity of an electromagnetic reverberation room field comprises the following steps.
And (3) a testing process for quickly confirming the uniformity of the electromagnetic reverberation room field and an analyzing process for quickly confirming the uniformity of the electromagnetic reverberation room field.
The testing process for quickly confirming the uniformity of the electromagnetic reverberation room field comprises the following steps: the three-dimensional photoelectric field probe is arranged at one fixed point position of an electromagnetic reverberation indoor working area, and the stirring paddle is rotated to any paddle position; the fixed point position is the vertex position of the working area.
Setting various parameters of a vector network analyzer; the parameters include bandwidth, number of scanning frequency points, transmitting power and intermediate frequency bandwidth.
Based on the scanning frequency points, S of all frequency points of 3 orthogonal axes of the three-dimensional optical electric field probe is sequentially measured in a sweep mode 21 Parameters and S 31 Parameters; s is S 21 Parameters are determined according to the transmitting power of the port 1 of the vector network analyzer and the receiving power of the port 2 of the vector network analyzer; s is S 31 The parameters are determined by the transmit power of port 1 of the vector network analyzer and the receive power of port 3 of the vector network analyzer.
And (3) rotating the stirring paddle to the next paddle position again until the test of all paddle positions of the stirring paddle at any certain position of the three-dimensional optical electric field probe is completed.
And setting the three-dimensional optical electric field probe at the next fixed point position of the working area again until the test of all fixed point positions is completed.
The analysis process for quickly confirming the uniformity of the electromagnetic reverberation room field comprises the following steps: acquiring various parameters of a three-dimensional photoelectric field probe and coupling coefficients of a directional coupler, and acquiring all S in a test process according to the electromagnetic reverberation room field uniformity rapid confirmation 21 Parameters, all S 31 Parameters, the coupling coefficient and various parameters of the three-dimensional optical electric field probe determine normalized field intensity; and each parameter of the three-dimensional photoelectric field probe comprises an antenna coefficient of the three-dimensional photoelectric field probe and a correction coefficient of a controller channel of the three-dimensional photoelectric field probe.
And calculating the field uniformity of the electromagnetic reverberation chamber according to the normalized field intensity.
Optionally, S 21 The parameters are as follows:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>S corresponding to the kth blade position at the jth fixed point position in the ith orthogonal axis direction 21 Parameters; />The received power of the port 2 corresponding to the kth paddle position at the jth fixed point position in the ith orthogonal axis direction; />The transmission power of the port 1 corresponding to the kth paddle position at the jth fixed point position in the ith orthogonal axis direction.
S 31 The parameters are as follows:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>S corresponding to the kth blade position at the jth fixed point position in the ith orthogonal axis direction 31 Parameters; />The received power of port 3 corresponding to the kth blade position at the jth setpoint position in the ith orthogonal axis direction.
Optionally, the normalized field strength is:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Normalized field strength; />Is the antenna coefficient; />Is a correction coefficient; />Is the coupling coefficient of the directional coupler.
An electronic device comprising a memory for storing a computer program and a processor that runs the computer program to cause the electronic device to perform the electromagnetic reverberation room field uniformity rapid confirmation method described above.
Optionally, the memory is a non-transitory computer readable storage medium, and the non-transitory computer readable storage medium stores a computer program, and the computer program when executed by the processor implements the electromagnetic reverberation room field uniformity rapid confirmation method.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: compared with the traditional field intensity probe which is used for reading the reading time of each field intensity component of each frequency point, the method has the advantages that the total frequency point field intensity measurement is completed within 10 seconds, the time cost of the total frequency point field intensity measurement is greatly reduced, and the field uniformity confirmation efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram of a conventional electromagnetic reverberation room field uniformity confirmation apparatus.
Fig. 2 is a schematic diagram of a conventional electromagnetic reverberation room field uniformity verification method.
Fig. 3 is a block diagram of an electromagnetic reverberation room field uniformity rapid confirmation apparatus according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a traversal relation of a method for quickly determining the uniformity of an electromagnetic reverberation room according to an embodiment of the present invention.
Fig. 5 is a flowchart of a method for quickly confirming the uniformity of an electromagnetic reverberation room field according to a second embodiment of the present invention.
Fig. 6 is a block diagram of a device for quickly confirming the uniformity of an electromagnetic reverberation room field according to a third embodiment of the present invention.
Fig. 7 is a flowchart of a method for quickly confirming the uniformity of an electromagnetic reverberation room field according to a fourth embodiment of the present invention.
Fig. 8 is a graph comparing the measurement results of the conventional electromagnetic reverberation room field uniformity method according to the fifth embodiment of the present invention and the electromagnetic reverberation room field uniformity method according to the present invention.
Fig. 9 is a graph comparing the measurement results of the conventional electromagnetic reverberation room field uniformity method according to the sixth embodiment of the present invention and the electromagnetic reverberation room field uniformity method according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a device, a method and equipment for quickly confirming the uniformity of an electromagnetic reverberation room field, which can shorten the time cost of full-frequency point field intensity measurement and improve the field uniformity confirmation efficiency.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Embodiment one: as shown in fig. 3, the present invention provides a device for rapidly confirming the uniformity of an electromagnetic reverberation room field, comprising: an electromagnetic reverberation room, a vector network analyzer and a photoelectric conversion controller; the port 1 of the vector network analyzer is connected with a transmitting antenna through a through-wall radio frequency cable of the electromagnetic reverberation chamber and is used for transmitting an excitation signal to the electromagnetic reverberation chamber through the transmitting antenna; and a port 2 of the vector network analyzer is connected with the photoelectric conversion controller and is used for receiving the radio frequency signals sent out by the photoelectric conversion controller.
The photoelectric conversion controller is connected with the three-dimensional optical electric field probe in the electromagnetic reverberation chamber and is used for converting an optical signal generated after the three-dimensional optical electric field probe senses an electric field into a radio frequency signal; the three-dimensional optical electric field probe is placed at a fixed point position of the electromagnetic reverberation indoor working area; the stirring paddles in the electromagnetic reverberation chamber are arranged in a non-working area, and the stirring paddles rotate to any blade position; the fixed point position is the vertex of the working area.
Determining normalized field intensity according to the transmitting power, the receiving power and various parameters of the three-dimensional optical electric field probe of the vector network analyzer; each parameter of the three-dimensional photoelectric field probe comprises an antenna coefficient of the three-dimensional photoelectric field probe and a correction coefficient of a controller channel of the three-dimensional photoelectric field probe; and calculating the field uniformity of the electromagnetic reverberation chamber according to the normalized field intensity.
In practical application, the three-dimensional optical electric field probe in fig. 3 is connected with a photoelectric conversion controller outside the cavity through a wall-penetrating optical fiber, the photoelectric conversion controller is a photoelectric conversion device, the conversion of optical signals generated after the three-dimensional optical electric field probe senses an electric field into radio frequency signals is realized, the radio frequency output of the photoelectric conversion controller can be connected with a reading device such as a power meter or a receiver, and the corresponding field intensity value is obtained through the calculation of the read level value of the power meter or the receiver.
The vector network analyzer is a comprehensive analyzer composed of signal source and receiver, and its port 1 (i.e. transmitting port) signal source transmits excitation signal, and port 2 (i.e. first receiving port) receiver receives signal, and the ratio of linear values of received signal and transmitted signal is Parameters. In fig. 3, port 1 of the vector network analyzer is connected to the inside of the cavity by a wall-through cableAnd the transmitting antenna and the port 2 are connected with a radio frequency interface of the photoelectric conversion controller. Because the vector network analyzer integrates the signal source and the receiver module, the signal source and the receiver module are synchronized with high efficiency, thereby realizing the rapid sweep measurement of broadband and multi-frequency points.
According to the invention, the scheme of combining the three-dimensional photoelectric field probe and the photoelectric conversion controller is adopted for electric field measurement, the three-dimensional photoelectric field probe is regarded as a receiving antenna, as shown in fig. 4, the measurement is carried out by adopting a frequency sweep mode of a vector network analyzer, the full frequency point data of one axis is obtained by each frequency sweep, the test efficiency is improved by more than 10 times, and the time and labor cost for confirming the uniformity of a reverberation room field are greatly saved; the method is particularly suitable for application scenes requiring multiple field uniformity confirmation, such as different loading states, different size working area division and the like.
Embodiment two: as shown in fig. 5, the invention combines the characteristic of rapid frequency sweep of a vector network analyzer with the efficient photoelectric conversion function of a three-dimensional photoelectric field probe, and proposes a rapid confirmation method for electromagnetic reverberation room field uniformity, which is applied to the rapid confirmation device for electromagnetic reverberation room field uniformity, and comprises the following steps: and (3) a testing process for quickly confirming the uniformity of the electromagnetic reverberation room field and an analyzing process for quickly confirming the uniformity of the electromagnetic reverberation room field.
The test procedure for rapid confirmation of electromagnetic reverberation room field uniformity is as follows.
Step 501: the three-dimensional photoelectric field probe is arranged at one fixed point position of an electromagnetic reverberation indoor working area, and the stirring paddle is rotated to any paddle position; the fixed point position is the vertex position of the working area.
Step 502: setting various parameters of a vector network analyzer; each parameter comprises bandwidth and scanning frequency point number N freq Transmit power, and intermediate frequency bandwidth. In the present embodiment N freq =1200。
Step 503: based on the scanning frequency points, S of all frequency points of 3 orthogonal axes of the three-dimensional optical electric field probe is sequentially measured in a sweep mode 21 Parameters; s is S 21 The parameters are based on the vector networkThe transmit power of port 1 of the analyzer and the receive power of port 2 of the vector network analyzer.
Step 504: turning the stirring paddle to the next paddle position again until the test of all paddle positions of the stirring paddle at any certain position of the three-dimensional optical electric field probe is traversed; the blade positions are the stepping positions of the stirring paddles, and the number of the blade positions is N stirrer In the present embodiment N stirrer =20。
Step 505: setting the three-dimensional optical electric field probe at the next fixed point position of the working area again until the test of all fixed point positions is completed; the number of the fixed point positions is N position ，N position The traversal procedure is shown in fig. 4.
The analysis process for rapid confirmation of electromagnetic reverberation room field uniformity is as follows.
The test duration of the invention is estimated: 8 fixed point positions, 20 blade positions, 1200 frequency points and 3-axis field intensity components of a working area are estimated according to 10s of one-time sweep measurement of 1200 frequency points (the actual test time is far less than 10 s), and then the total time required for completing the confirmation of the field uniformity of one time is as follows: t=8×20×3×10s=4800s=1.4 h.
The primary field uniformity confirmation only needs less than 1.5 hours, and compared with the traditional method, the testing efficiency is improved by tens of times; even if the field uniformity confirmation is completed in half a day or even 1 day by considering the arrangement, debugging and other factors before the test of the reverberation room, the efficiency is quite considerable. This is quite significant in terms of time cost saved by efficiency improvement for application scenarios requiring multiple field uniformity confirmation, such as reverberation room workspace size adjustment, different loading, etc.
Step 506: acquiring various parameters of the three-dimensional photoelectric field probe, and acquiring all S in the test process according to the electromagnetic reverberation room field uniformity rapid confirmation 21 Parameters and parameters of the three-dimensional optical electric field probe determine normalized field intensity; and each parameter of the three-dimensional photoelectric field probe comprises an antenna coefficient of the three-dimensional photoelectric field probe and a correction coefficient of a controller channel of the three-dimensional photoelectric field probe.
Step 507: and calculating the field uniformity of the electromagnetic reverberation chamber according to the normalized field intensity.
The process of calculating field uniformity after converting the normalized field strength into a linear value is as follows.
Wherein->For the maximum value of normalized field intensity corresponding to all blade positions at the jth fixed point position in the ith orthogonal axis direction,the normalized field intensity corresponding to the kth blade position at the jth fixed point position in the ith orthogonal axis direction is V/m;to maximize for all blade positions.
The invention obtains maximum values of 24 (8 fixed point positions multiplied by 3 orthogonal axis directions) of each measurement frequency point.
Then, for these 24 maxima, the standard deviation, i.e. the field uniformity, is calculated.。
Wherein s is field uniformity;is the average of 24 maximum values, +.>。
The result of field uniformity is typically expressed in log, in dB, and the calculation formula converted to log is as follows:
，is a logarithmic representation of field uniformity.
The invention measuresThe parameters are not directly obtained field intensity, so that the field intensity value is required to be calculated by data processing.
The field intensity of the three-dimensional optical electric field probe is calculated according to the measured received power, and the calculation formula is as follows:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Calculating a value of the field intensity of the three-dimensional photoelectric field probe, dBV/m,/v >Representing the respective field strength components, i.e. X, Y, Z three orthogonal axis directions of the three-dimensional optical field probe,/->Representing the fixed point position of the three-dimensional optical electric field probe, corresponding to 8 vertexes of the working area, +.>Representing each stepping position of the stirring paddle; />Receiving power of the port 2 corresponding to the kth paddle position at the jth fixed point position in the ith orthogonal axis direction in dBm; AF is the antenna coefficient of the field intensity probe, can inquire the data of the manufacturer, can also be obtained through calibration, unit dB/m; />The three channels correspond to the X, Y, Z three orthogonal axes of the three-dimensional optical electric field probe respectively, and the unit is dB.
If vector network analyzerThe power of the port 1 transmit signal isThen the corresponding normalized field strength is:
。
for vector network analysis, measuredI.e., the ratio of the received power at port 2 to the transmitted power at port 1, since the linear ratio is equal to the logarithmic difference, when expressed in logarithmic form,
the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>S21 parameters corresponding to the kth paddle position at the jth fixed point position in the ith orthogonal axis direction; />And the transmission power of the port 1 corresponding to the kth paddle position at the jth fixed point position in the ith orthogonal axis direction.
Therefore, the normalized field strength is:
。
the normalized field intensity is a logarithmic unit, and after the normalized field intensity is converted into the linear field intensity, the electromagnetic reverberation room field uniformity is analyzed according to the electromagnetic reverberation room field uniformity rapid confirmation method provided by the second embodiment.
The invention fully utilizes the characteristics of the vector network analyzer that the vector network analyzer has signal sources and multiple receivers, can simultaneously replace the equipment such as signals, power meters and the like in the traditional measurement scheme, reduces the volume of the equipment and is convenient for transportation; and alsoThe parameter is defined as the ratio of the received at port 2 to the linear value transmitted at port 1, corresponding to normalization, then only the +_ is recorded during the measurement process>The parameters can be used for carrying out subsequent normalized field intensity calculation, and the traditional method needs to record the power value monitored by the power and the data of the field intensity reading device at the same time, and then carrying out normalized field intensity calculation by using the monitored power; in comparison, the method has the advantages of lower measurement complexity, less recorded data volume and more stable and reliable result.
Embodiment III: since the vector network analyzer has a certain dynamic range (typically the manufacturer will give an index in the 60dB dynamic range, which is measured in this range)The parameters are stable and reliable; the signal-to-noise ratio is poor when the dynamic range of most vector network analyzers exceeds 90 dB), if the insertion loss is large due to the large reverberation room size, the accuracy of field uniformity confirmation by adopting the technical scheme provided by the embodiment one can be affected.
As shown in fig. 6, compared to the electromagnetic reverberation room field uniformity rapid confirmation apparatus provided in the first embodiment, the electromagnetic reverberation room field uniformity rapid confirmation apparatus provided in the third embodiment further includes: a power amplifier and a directional coupler; the transmitting port of the vector network analyzer is connected with the input end of the power amplifier; the output end of the power amplifier is connected with the input end of the directional coupler; the coupling end of the directional coupler is connected with the port 3 of the vector network analyzer; the output end of the directional coupler is connected with a transmitting antenna through a through-wall radio frequency cable of the electromagnetic reverberation chamber.
Port 1 of the vector network analyzer is connected as output to the input of the power amplifier; the output end of the power amplifier is connected to the input end of the directional coupler, and the coupling end of the directional coupler is connected to the port 3 (namely the second receiving port) of the vector network analyzer; the output end of the directional coupler is connected to the transmitting antenna through a through-wall radio frequency cable; the connection mode of the three-dimensional photoelectric field probe and the photoelectric conversion controller and the connection mode of the photoelectric conversion controller and the vector network analyzer are unchanged.
Embodiment four: as shown in fig. 7, the present invention provides a method for quickly confirming the uniformity of an electromagnetic reverberation room, which is applied to the device for quickly confirming the uniformity of an electromagnetic reverberation room provided in the third embodiment, and the method for quickly confirming the uniformity of an electromagnetic reverberation room comprises: and (3) a testing process for quickly confirming the uniformity of the electromagnetic reverberation room field and an analyzing process for quickly confirming the uniformity of the electromagnetic reverberation room field.
Step 701: the testing process for quickly confirming the uniformity of the electromagnetic reverberation room field comprises the following steps: the three-dimensional photoelectric field probe is arranged at one fixed point position of an electromagnetic reverberation indoor working area, and the stirring paddle is rotated to any paddle position; the fixed point position is the vertex position of the working area.
Step 702: setting various parameters of a vector network analyzer; the parameters include bandwidth, number of scanning frequency points, transmitting power and intermediate frequency bandwidth.
Step 703: based on the scanning frequency points, S of all frequency points of 3 orthogonal axes of the three-dimensional optical electric field probe is sequentially measured in a sweep mode 21 Parameters and S 31 Parameters; s is S 21 Parameters are determined according to the transmitting power of the port 1 of the vector network analyzer and the receiving power of the port 2 of the vector network analyzer; s is S 31 The parameters are determined by the transmit power of port 1 of the vector network analyzer and the receive power of port 3 of the vector network analyzer.
Step 704: and (3) rotating the stirring paddle to the next paddle position again until the test of all paddle positions of the stirring paddle at any certain position of the three-dimensional optical electric field probe is completed.
Step 705: and setting the three-dimensional optical electric field probe at the next fixed point position of the working area again until the test of all fixed point positions is completed.
The analysis process for rapid confirmation of electromagnetic reverberation room field uniformity is as follows.
Step 706: acquiring various parameters of a three-dimensional photoelectric field probe and coupling coefficients of a directional coupler, and acquiring all S in a test process according to the electromagnetic reverberation room field uniformity rapid confirmation 21 Parameters, all S 31 Parameters, the coupling coefficient and various parameters of the three-dimensional optical electric field probe determine normalized field intensity; and each parameter of the three-dimensional photoelectric field probe comprises an antenna coefficient of the three-dimensional photoelectric field probe and a correction coefficient of a controller channel of the three-dimensional photoelectric field probe.
Step 707: and calculating the field uniformity of the electromagnetic reverberation chamber according to the normalized field intensity.
Since the invention measuresParameters, & gt>The parameters are not directly obtained field intensity, so that the field intensity value needs to be calculated through data analysis processing.
The field intensity of the three-dimensional optical electric field probe is calculated according to the measured received power, and the following formula is adopted:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Receiving power of a receiver of a port 2 of the vector network analyzer, namely receiving power of the port 2 corresponding to the kth paddle position of the jth fixed point position in the direction of the ith orthogonal axis, dBm; if the power of the signal transmitted by port 1 of the vector network analyzer is +.>I.e. the transmission power of the port 1 corresponding to the kth blade position of the jth fixed point position in the ith orthogonal axis direction, the power received by the receiver of the port 3 is +.>I.e. the coupling power of the port 3 corresponding to the kth blade position at the jth fixed point position in the ith orthogonal axis direction, there is
；S corresponding to the kth blade position at the jth fixed point position in the ith orthogonal axis direction 21 Parameters.
；S corresponding to the kth blade position at the jth fixed point position in the ith orthogonal axis direction 31 Parameters.
The output signal strength of the power amplifier is:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Is the coupling coefficient of the directional coupler, in dBm.
The corresponding normalized field strength is then:
。
The field intensity is in logarithmic units, and the electromagnetic reverberation room field uniformity is analyzed according to the method for calculating the field uniformity by the normalized field intensity provided in the second embodiment.
The embodiment of the invention needs 4-port vector network divisionAnalytical instrument capable of simultaneous measurementParameters, & gt>Parameters. Due to the use of the power amplifier, the dynamic range of measurement can be effectively improved, and the universality of the quick confirmation method is enhanced.
The invention simultaneously measures、/>Parameters of->For->Normalization is performed to obtain normalized field intensity. The invention is a perfect supplement to the electromagnetic reverberation room field uniformity quick confirmation method provided by the second embodiment, the measurement time is equivalent, but the dynamic range of measurement is expanded, the universality of field uniformity confirmation is increased, and the method is suitable for field uniformity confirmation of various large-scale electromagnetic reverberation rooms.
The method for quickly confirming the field uniformity of the electromagnetic reverberation chamber provided by the second embodiment is described by using the two embodiments, and different stirring steps are selected for the same electromagnetic reverberation chamber by defining working areas with different sizes. Work area 1:3m (length) ×2m (width) ×3m (height); work area 2:2.5m (length) ×1.7m (width) ×2m (height).
Fifth embodiment: reverberant room field uniformity confirmation (large working area, multiple stirring steps).
And (5) defining a working area for any electromagnetic reverberation chamber, and confirming field uniformity. The working area is a cuboid area with the size of 3m (length) multiplied by 2m (width) multiplied by 3m (height), the working area is 1m away from the ground, and the distance from the wall and the blade is more than 0.5m. Firstly, a traditional electromagnetic reverberation room field uniformity confirmation method is used for confirming field uniformity, and the adopted equipment mainly comprises a signal source, a power amplifier, a directional coupler, a power meter, a field intensity probe and a field intensity reading device. When the field uniformity is confirmed, the probe is respectively placed at 8 vertexes of a cuboid working area through manual movement, the 8 vertexes are respectively named as P1-P8, four points of southeast, southwest, northwest and northeast at a height of 1m are respectively defined as P1, P2, P3 and P4, and four points of southeast, southwest, northwest and northeast at a height of 4m are respectively defined as P5, P6, P7 and P8. 70 frequency points are selected in the 200 MHz-1 GHz frequency range, and the field uniformity is confirmed by rotating the blade 100 steps.
The conventional electromagnetic reverberation room field uniformity confirmation method is as follows.
1) The field strength probe is placed at one vertex of the working area.
2) The stirring paddle is rotated to a paddle position.
3) A frequency of the signal source is set.
4) The power meter reading at this time is read and the field strength values of the 3 orthogonal axes (XYZ) of the field strength reading device are sequentially read.
5) Repeating the steps 3) and 4) until all N are traversed freq And testing the frequency points.
6) Repeating the steps 2) to 5) until all N are traversed stirrer Testing the positions of the blades; during confirmation of the reverberation chamber, it is necessary to control the rotation of the stirring paddles at different angles, typically at equal angular intervals, for example one revolution of 20 positions, i.e. defining a blade position every 18 degrees.
7) Repeating the steps 1) to 6) until all N are traversed position Testing the vertices of the working area.
The test process of field uniformity confirmation is finished, and the traverse of the other three parameters is realized through computer program control except that the position movement of the field intensity probe needs to be realized manually in the test process. And then, judging whether the result meets the limit value requirement or not by analyzing and calculating the result of the field uniformity. The method of analytically calculating field uniformity is as follows.
Firstly, calculating normalized field intensity according to the following formula, namely, carrying out normalization processing on the measured field intensity value by using the input power monitored by the corresponding power meter.
。
Wherein,the method is characterized in that the method is used for measuring field intensity, V/m, of a kth blade position at a jth vertex position in the direction of an ith orthogonal axis of a three-dimensional photoelectric field probe (field intensity probe); / >Measuring a monitoring power, W, for the power meter at a kth blade position at a jth vertex position in an ith orthogonal axis direction; />The normalized field intensity value of the kth blade position at the jth vertex position in the ith orthogonal axis direction is V/m.
Then, the field uniformity of the electromagnetic reverberation chamber was analyzed according to the method of calculating field uniformity with normalized field strength provided in embodiment two.
。
Wherein,to find the maximum value for all blade positions +.>The maximum value of normalized field intensity corresponding to all blade positions at the jth fixed point position in the ith orthogonal axis direction.
The invention obtains maximum values of 24 (8 vertex positions multiplied by 3 orthogonal axis directions) of each measurement frequency point.
Then, for these 24 maxima, the standard deviation, i.e. the field uniformity, is calculated.
。
Wherein s is field uniformity;is the average value of the 24 maximum values,
。
the result of field uniformity is typically expressed in log, in dB, and the calculation formula converted to log is as follows:
，is a logarithmic representation of field uniformity.
And then, confirming the uniformity of the working area by adopting a rapid reverberation room field uniformity confirming method. The mainly adopted equipment is a vector network analyzer, a three-dimensional optical electric field probe and a photoelectric conversion controller. 2046 frequency points are selected in the frequency range of 200 MHz-1 GHz in the working area with the same size, and the field uniformity is confirmed by rotating the blade for 100 steps.
The results of field uniformity performed by the two methods are shown in fig. 8, and fig. 8 shows 100-step field uniformity comparison, namely 2046 frequency points provided by the invention are compared with 70 frequency points of the traditional method. The results of the two confirmation are seen to have better consistency, the whole of the two curves is smaller than 2.5dB below 300MHz, the upper part of 300MHz is mainly smaller than 2dB, and both curves are lower than the limit value of the IEC standard. Meanwhile, the frequency points measured by the method are denser and are more than 20 times of the frequency points measured by the traditional method, and the measuring time is shorter: the method measures about 6 hours in actual use, and the traditional method measures about 21 hours in actual use, so that the efficiency improvement is obvious.
Example six: the uniformity of the electromagnetic reverberation room field was confirmed rapidly (small working area, few stirring steps).
The electromagnetic reverberation chamber is the same as that of the fifth embodiment, and the conventional method and the confirmation method provided by the invention are respectively adopted for confirming the field uniformity, and the equipment and the connection mode adopted by the two methods are kept unchanged. The working area was defined as a rectangular parallelepiped area of 2.5m (length) ×1.7m (width) ×2m (height), and the working area was 1m from the ground. The stirring paddle rotates for 10 steps, 101 frequency points are selected in the frequency range of 200 MHz-1 GHz in the traditional method, and 801 frequency points are selected in the frequency range of 200 MHz-1 GHz in the traditional method. As shown in fig. 9, fig. 9 shows a comparison of field uniformity of 10 steps, namely, the 801 frequency point of the invention is compared with the 101 frequency point of the traditional method, and similar to the fifth embodiment, the two methods have better consistency, and compared with the traditional field uniformity confirmation method, the electromagnetic reverberation room field uniformity quick confirmation method provided by the invention has more (8 times) frequency points measured and shorter time (about 3.5 hours of the traditional method and about 1 hour of the method).
Based on the comparison result of the fifth embodiment and the sixth embodiment, aiming at the problems of low testing efficiency and long testing time of the traditional method for confirming the uniformity of the reverberation room field, the invention can realize the improvement of more than ten times of testing efficiency and solve the difficult problem of quick and effective confirmation of the uniformity of the reverberation room field in the fields of national defense, military industry, new energy automobiles and the like.
1) An electric field measurement scheme adopting a combination of a three-dimensional optical electric field probe and a photoelectric conversion controller is provided, the scheme uses an external power meter or a receiver to receive power, and the received power is corrected and calculated through an antenna coefficient and a channel coefficient to obtain a field intensity value. The three-dimensional photoelectric field probe has small volume and high sensitivity, converts an induced electric field signal into an optical signal and transmits the optical signal out of the cavity, has small disturbance on electric field distribution in the reverberation chamber, and is accurate and reliable in test; the photoelectric conversion controller converts the three-channel optical interface into a radio frequency interface, the built-in change-over switch can switch channels in a program control or manual mode, and the advantage of converting the three-channel optical interface into the radio frequency interface is that various receivers can be selected so as to improve the measurement speed by using a specific receiver (such as a receiver of a vector network analyzer).
2) The combination of a three-dimensional optical electric field probe and a photoelectric conversion controller is taken as a receiving antenna, and a port 1 of a vector network analyzer, Two ports of the port 2 are respectively connected with a transmitting antenna and a receiving antenna, and all frequency points which are set at one time are measured through sweep frequencyParameters. Port 1 transmit power, port 2 receive power and +.>A normalized field strength measurement is derived. The method is suitable for field uniformity confirmation of small and medium-sized reverberation chambers (such as insertion loss of less than 60 dB).
3) On the basis of 2), a method for confirming the quick field uniformity of a reverberation room by adopting a vector network analyzer, a power amplifier, a three-dimensional photoelectric field probe and a photoelectric conversion controller is provided, wherein the vector network analyzer is required to be at least four ports, a port 1 is used as an input end of transmitting and accessing a power amplifier, a port 2 is connected with a radio frequency output end of the photoelectric conversion controller, a port 3 is connected with a coupling output end of a directional coupler, and the method simultaneously obtains、/>Parameters (I)>Parameters for measuring the internal field strength of the reverberant chamber, < >>For monitoring the output power of the power amplifier, which in combination derive a normalized field strength value. The method is suitable for field uniformity confirmation of large reverberation chambers (such as insertion loss above 60 dB).
Embodiment seven: an electronic device comprising a memory for storing a computer program and a processor that runs the computer program to cause the electronic device to perform the electromagnetic reverberation room field uniformity rapid confirmation method according to embodiment two or embodiment four.
A computer-readable storage medium storing a computer program which, when executed by a processor, implements the electromagnetic reverberation room field uniformity rapid confirmation method according to the second or fourth embodiment.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. An electromagnetic reverberation room field uniformity quick confirmation device, characterized by comprising: an electromagnetic reverberation room, a vector network analyzer and a photoelectric conversion controller;
The port 1 of the vector network analyzer is connected with a transmitting antenna through a through-wall radio frequency cable of the electromagnetic reverberation chamber and is used for transmitting an excitation signal to the electromagnetic reverberation chamber through the transmitting antenna; the port 2 of the vector network analyzer is connected with the photoelectric conversion controller and is used for receiving radio frequency signals sent out from the photoelectric conversion controller;
the photoelectric conversion controller is connected with the three-dimensional optical electric field probe in the electromagnetic reverberation chamber and is used for converting an optical signal generated after the three-dimensional optical electric field probe senses an electric field into a radio frequency signal; the three-dimensional optical electric field probe is placed at a fixed point position of the electromagnetic reverberation indoor working area; the stirring paddles in the electromagnetic reverberation chamber are arranged in a non-working area, and the stirring paddles rotate to any blade position; the fixed point position is the vertex of the working area;
determining normalized field intensity according to the transmitting power, the receiving power and various parameters of the three-dimensional optical electric field probe of the vector network analyzer; each parameter of the three-dimensional photoelectric field probe comprises an antenna coefficient of the three-dimensional photoelectric field probe and a correction coefficient of a controller channel of the three-dimensional photoelectric field probe; and calculating the field uniformity of the electromagnetic reverberation chamber according to the normalized field intensity.
2. The electromagnetic reverberant room field uniformity quick verification apparatus according to claim 1, further comprising: a power amplifier and a directional coupler;
the port 1 of the vector network analyzer is connected with the input end of the power amplifier; the output end of the power amplifier is connected with the input end of the directional coupler; the coupling end of the directional coupler is connected with the port 3 of the vector network analyzer; the output end of the directional coupler is connected with a transmitting antenna through a through-wall radio frequency cable of the electromagnetic reverberation chamber.
3. An electromagnetic reverberation room field uniformity rapid confirmation method, characterized in that the electromagnetic reverberation room field uniformity rapid confirmation method is applied to the electromagnetic reverberation room field uniformity rapid confirmation device of claim 1, and the electromagnetic reverberation room field uniformity rapid confirmation method comprises the following steps: a test process for quickly confirming the uniformity of the electromagnetic reverberation room field and an analysis process for quickly confirming the uniformity of the electromagnetic reverberation room field;
the testing process for quickly confirming the uniformity of the electromagnetic reverberation room field comprises the following steps: the three-dimensional photoelectric field probe is arranged at one fixed point position of an electromagnetic reverberation indoor working area, and the stirring paddle is rotated to any paddle position; the fixed point position is the vertex position of the working area;
Setting various parameters of a vector network analyzer; each parameter comprises bandwidth, scanning frequency number, transmitting power and intermediate frequency bandwidth;
based on the number of scanning frequency points, sequentially measuring the three-dimensional light by sweeping frequencyS of all frequency points of 3 orthogonal axes of the electric field probe 21 Parameters; s is S 21 Parameters are determined according to the transmitting power of the port 1 of the vector network analyzer and the receiving power of the port 2 of the vector network analyzer;
turning the stirring paddle to the next paddle position again until the test of all paddle positions of the stirring paddle at any certain position of the three-dimensional optical electric field probe is traversed;
setting the three-dimensional optical electric field probe at the next fixed point position of the working area again until the test of all fixed point positions is completed;
the analysis process for quickly confirming the uniformity of the electromagnetic reverberation room field comprises the following steps:
acquiring various parameters of the three-dimensional photoelectric field probe, and acquiring all S in the test process according to the electromagnetic reverberation room field uniformity rapid confirmation 21 Parameters and parameters of the three-dimensional optical electric field probe determine normalized field intensity; each parameter of the three-dimensional photoelectric field probe comprises an antenna coefficient of the three-dimensional photoelectric field probe and a correction coefficient of a controller channel of the three-dimensional photoelectric field probe;
And calculating the field uniformity of the electromagnetic reverberation chamber according to the normalized field intensity.
4. The method for rapidly confirming electromagnetic reverberation room field uniformity according to claim 3, wherein S 21 The parameters are as follows:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>S corresponding to the kth blade position at the jth fixed point position in the ith orthogonal axis direction 21 Parameters; />The received power of the port 2 corresponding to the kth paddle position at the jth fixed point position in the ith orthogonal axis direction; />The transmission power of the port 1 corresponding to the kth paddle position at the jth fixed point position in the ith orthogonal axis direction.
5. The method for rapidly confirming electromagnetic reverberation room field uniformity according to claim 4, wherein the normalized field strength is:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Normalized field strength; />Is the antenna coefficient; />Is a correction coefficient.
6. An electromagnetic reverberation room field uniformity rapid confirmation method, characterized in that the electromagnetic reverberation room field uniformity rapid confirmation method is applied to the electromagnetic reverberation room field uniformity rapid confirmation device of claim 2, and the electromagnetic reverberation room field uniformity rapid confirmation method comprises the following steps:
a test process for quickly confirming the uniformity of the electromagnetic reverberation room field and an analysis process for quickly confirming the uniformity of the electromagnetic reverberation room field;
The testing process for quickly confirming the uniformity of the electromagnetic reverberation room field comprises the following steps: the three-dimensional photoelectric field probe is arranged at one fixed point position of an electromagnetic reverberation indoor working area, and the stirring paddle is rotated to any paddle position; the fixed point position is the vertex position of the working area;
setting various parameters of a vector network analyzer; each parameter comprises bandwidth, scanning frequency number, transmitting power and intermediate frequency bandwidth;
based on the scanning frequency points, S of all frequency points of 3 orthogonal axes of the three-dimensional optical electric field probe is sequentially measured in a sweep mode 21 Parameters and S 31 Parameters; s is S 21 Parameters are determined according to the transmitting power of the port 1 of the vector network analyzer and the receiving power of the port 2 of the vector network analyzer; s is S 31 The parameters are determined by the transmitting power of the port 1 of the vector network analyzer and the receiving power of the port 3 of the vector network analyzer;
turning the stirring paddle to the next paddle position again until the test of all paddle positions of the stirring paddle at any certain position of the three-dimensional optical electric field probe is traversed;
setting the three-dimensional optical electric field probe at the next fixed point position of the working area again until the test of all fixed point positions is completed;
The analysis process for quickly confirming the uniformity of the electromagnetic reverberation room field comprises the following steps:
acquiring various parameters of a three-dimensional photoelectric field probe and coupling coefficients of a directional coupler, and acquiring all S in a test process according to the electromagnetic reverberation room field uniformity rapid confirmation 21 Parameters, all S 31 Parameters, the coupling coefficient and various parameters of the three-dimensional optical electric field probe determine normalized field intensity; each parameter of the three-dimensional photoelectric field probe comprises an antenna coefficient of the three-dimensional photoelectric field probe and a correction coefficient of a controller channel of the three-dimensional photoelectric field probe;
and calculating the field uniformity of the electromagnetic reverberation chamber according to the normalized field intensity.
7. The method for rapidly confirming electromagnetic reverberation room field uniformity according to claim 6, wherein S 21 The parameters are as follows:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Is the ith orthogonalS corresponding to the kth paddle position at the jth fixed point position in the axial direction 21 Parameters; />The received power of the port 2 corresponding to the kth paddle position at the jth fixed point position in the ith orthogonal axis direction; />Transmitting power of the port 1 corresponding to the kth paddle position at the jth fixed point position in the ith orthogonal axis direction;
S 31 the parameters are as follows:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>S corresponding to the kth blade position at the jth fixed point position in the ith orthogonal axis direction 31 Parameters; />The received power of port 3 corresponding to the kth blade position at the jth setpoint position in the ith orthogonal axis direction.
8. The method for rapidly confirming electromagnetic reverberation room field uniformity according to claim 7, wherein the normalized field strength is:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Normalized field strength; />Is the antenna coefficient; />Is a correction coefficient; />Is the coupling coefficient of the directional coupler.
9. An electronic device comprising a memory for storing a computer program and a processor that runs the computer program to cause the electronic device to perform the electromagnetic reverberation room field uniformity rapid confirmation method according to any one of claims 3 to 7.
10. The electronic device of claim 9, wherein the memory is a non-transitory computer readable storage medium storing a computer program that when executed by a processor implements the electromagnetic reverberation room field uniformity rapid confirmation method of any one of claims 3-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410069897.7A CN117590090B (en) | 2024-01-18 | 2024-01-18 | Device, method and equipment for quickly confirming uniformity of electromagnetic reverberation room field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410069897.7A CN117590090B (en) | 2024-01-18 | 2024-01-18 | Device, method and equipment for quickly confirming uniformity of electromagnetic reverberation room field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117590090A CN117590090A (en) | 2024-02-23 |
| CN117590090B true CN117590090B (en) | 2024-04-02 |
Family
ID=89911876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410069897.7A Active CN117590090B (en) | 2024-01-18 | 2024-01-18 | Device, method and equipment for quickly confirming uniformity of electromagnetic reverberation room field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117590090B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118191483A (en) * | 2024-05-15 | 2024-06-14 | 中汽研新能源汽车检验中心(天津)有限公司 | System and method for testing electromagnetic environmental effect of reverberation indoor vehicle |
| CN118191484B (en) * | 2024-05-15 | 2024-07-23 | 中汽研新能源汽车检验中心(天津)有限公司 | Automobile electromagnetic interference immunity test method and equipment based on whole automobile electromagnetic reverberation room |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013175263A1 (en) * | 2012-05-22 | 2013-11-28 | Supelec | Method and system for generation of a statistically spatially-uniform field distribution inside a reverberation chamber |
| CN103743959A (en) * | 2014-01-24 | 2014-04-23 | 中国人民解放军军械工程学院 | Method for testing shielding effectiveness of irregular structure cavity in reverberation chamber based on frequency stirring technology |
| CN103760445A (en) * | 2014-01-24 | 2014-04-30 | 中国人民解放军军械工程学院 | Method for testing shielding effectiveness of irregular structure cavity based on reverberation room |
| CN106483485A (en) * | 2016-11-03 | 2017-03-08 | 北京无线电计量测试研究所 | A kind of high strength field sensor calibrating method and system |
| KR20190022960A (en) * | 2017-08-23 | 2019-03-07 | 한국전자통신연구원 | Method and system for measuring radiated emission based reverberation chamber |
| WO2020053537A1 (en) * | 2018-09-12 | 2020-03-19 | The Secretary Of State For Defence | Over the air test configuration and method |
| CN111337758A (en) * | 2020-03-11 | 2020-06-26 | 南京航空航天大学 | Antenna radiation efficiency measuring method based on reverberation chamber |
| CN112415280A (en) * | 2020-11-26 | 2021-02-26 | 上海卫星装备研究所 | Spacecraft radiation emission test system and method based on electric wave reverberation chamber |
| CN113804985A (en) * | 2021-08-30 | 2021-12-17 | 西安交通大学 | Anti-interference antenna directional pattern measuring method based on hybrid shielding chamber |
| CN114034950A (en) * | 2021-10-29 | 2022-02-11 | 西安空间无线电技术研究所 | System and method for testing electromagnetic leakage degree of aerospace passive product based on reverberation chamber |
| CN114487617A (en) * | 2022-01-12 | 2022-05-13 | 中国人民解放军63892部队 | Method for quickly evaluating normalized field intensity of reverberation chamber |
| CN115542026A (en) * | 2022-09-23 | 2022-12-30 | 中国人民解放军63892部队 | Antenna efficiency testing method based on reverberation chamber |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8035370B2 (en) * | 2009-03-10 | 2011-10-11 | The Boeing Company | Systems and methods to stir an electromagnetic (EM) field |
-
2024
- 2024-01-18 CN CN202410069897.7A patent/CN117590090B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013175263A1 (en) * | 2012-05-22 | 2013-11-28 | Supelec | Method and system for generation of a statistically spatially-uniform field distribution inside a reverberation chamber |
| CN103743959A (en) * | 2014-01-24 | 2014-04-23 | 中国人民解放军军械工程学院 | Method for testing shielding effectiveness of irregular structure cavity in reverberation chamber based on frequency stirring technology |
| CN103760445A (en) * | 2014-01-24 | 2014-04-30 | 中国人民解放军军械工程学院 | Method for testing shielding effectiveness of irregular structure cavity based on reverberation room |
| CN106483485A (en) * | 2016-11-03 | 2017-03-08 | 北京无线电计量测试研究所 | A kind of high strength field sensor calibrating method and system |
| KR20190022960A (en) * | 2017-08-23 | 2019-03-07 | 한국전자통신연구원 | Method and system for measuring radiated emission based reverberation chamber |
| WO2020053537A1 (en) * | 2018-09-12 | 2020-03-19 | The Secretary Of State For Defence | Over the air test configuration and method |
| CN111337758A (en) * | 2020-03-11 | 2020-06-26 | 南京航空航天大学 | Antenna radiation efficiency measuring method based on reverberation chamber |
| CN112415280A (en) * | 2020-11-26 | 2021-02-26 | 上海卫星装备研究所 | Spacecraft radiation emission test system and method based on electric wave reverberation chamber |
| CN113804985A (en) * | 2021-08-30 | 2021-12-17 | 西安交通大学 | Anti-interference antenna directional pattern measuring method based on hybrid shielding chamber |
| CN114034950A (en) * | 2021-10-29 | 2022-02-11 | 西安空间无线电技术研究所 | System and method for testing electromagnetic leakage degree of aerospace passive product based on reverberation chamber |
| CN114487617A (en) * | 2022-01-12 | 2022-05-13 | 中国人民解放军63892部队 | Method for quickly evaluating normalized field intensity of reverberation chamber |
| CN115542026A (en) * | 2022-09-23 | 2022-12-30 | 中国人民解放军63892部队 | Antenna efficiency testing method based on reverberation chamber |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117590090A (en) | 2024-02-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN117590090B (en) | Device, method and equipment for quickly confirming uniformity of electromagnetic reverberation room field | |
| JP4528480B2 (en) | Method and apparatus for measuring the performance of antennas, mobile phones, and other wireless terminals | |
| CN109116182B (en) | Device and method for measuring shielding effectiveness of shielding case of communication cable connector | |
| CN112485538B (en) | System for improving calibration precision of radio frequency radiation sensitivity of reverberation room | |
| CN111337758B (en) | Antenna radiation efficiency measuring method based on reverberation chamber | |
| CN101166067B (en) | CDMA mobile terminal radiation stray testing device and method | |
| CN110535539B (en) | Power compensation method, device, equipment and medium for radio frequency module | |
| CN113162706B (en) | Radio frequency performance test method and system for wireless equipment | |
| CN101951634B (en) | Method and system for automatic power control calibration of TD-LTE terminal | |
| CN110470871B (en) | Single-port multi-state-based material electromagnetic parameter testing device and method | |
| CN106772177B (en) | A kind of emf sensor calibration system based on reverberation chamber and transmitting probe | |
| Alexander et al. | Low measurement uncertainties in the frequency range 30 MHz to 1 GHz using a calculable standard dipole antenna and national reference ground plane | |
| CN210927638U (en) | Wireless terminal signal testing device | |
| CN115047257A (en) | Automatic antenna measuring system based on spherical surface near field measurement | |
| CN115292912A (en) | Near-field high-power-density radiation implementation method | |
| Démoulin et al. | Shielded cable transfer impedance measurements in the microwave range of 1 GHz to 10 GHz | |
| CN115267356A (en) | Boundary deformation cross coupling reverberation chamber shielding effectiveness testing device and method | |
| CN103983937A (en) | Signal detection system applied to anechoic chamber | |
| CN108414840B (en) | Method for measuring insertion loss of electromagnetic reverberation chamber | |
| CN113484549A (en) | EVM measuring method suitable for OTA test | |
| CN211352199U (en) | Automatic testing arrangement of multichannel signal selector of control | |
| Kildal et al. | Designing reverberation chambers for measurements of small antennas and wireless terminals: Accuracy, frequency resolution, lowest frequency of operation, loading and shielding of chamber | |
| CN118130956B (en) | Mixed test system compatible with radiation stray and radiation immunity test | |
| Zhang et al. | Some Common Methods of Measuring Noise Figure of Receiver | |
| CN117890683B (en) | Method and system for measuring total radiation power of active wireless communication equipment and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |