CN118226444A - Microwave imaging method and system, transmitting and receiving terminal, and computer readable medium - Google Patents
Microwave imaging method and system, transmitting and receiving terminal, and computer readable medium Download PDFInfo
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- 238000003384 imaging method Methods 0.000 title claims abstract description 66
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Abstract
The application provides a microwave imaging method and a system, a transmitting and receiving terminal and a computer readable medium, wherein the microwave imaging method applied to the receiving terminal comprises the following steps: in the process that a target to be detected is positioned at a center point and a receiving terminal makes a round along a target plane relative to the center point, a first microwave signal scattered by the target to be detected and first position information of the receiving terminal are acquired at fixed time; the target plane is a plane where a section to be measured of the target to be measured is located; performing spectrum analysis on the first microwave signal to obtain received spectrum data corresponding to the first position information; and carrying out inversion calculation according to the received frequency spectrum data corresponding to the first position information to obtain the image information of the target to be detected.
Description
Technical Field
The embodiment of the application relates to the technical field of microwaves, in particular to a microwave imaging method and system, a transmitting and receiving terminal and a computer readable medium.
Background
Microwaves refer to electromagnetic waves with frequencies between 300 megahertz (MHz) and 300 gigahertz (GHz) and corresponding wavelengths of 1 meter (m) to 1 millimeter (mm), and compared with the optical wave band, microwaves have lower frequencies and stronger penetrability, so that the microwaves can be used for detecting the scenes inside objects which cannot be seen by sight. The microwave imaging technology is to transmit incident electromagnetic waves in a microwave band to an object, and then reconstruct dielectric constant distribution of the object through measurement values of scattering fields outside the object to obtain information such as material composition, shape distribution and the like inside the object.
The microwave imaging has the greatest advantage of being capable of carrying out safe and low-cost nondestructive line-of-sight detection, and the technology can detect the internal image of the object which cannot be detected by the optical camera. Since the dielectric constant is closely related to the water content of biological tissues, the microwave imaging is very suitable for imaging the biological tissues, when the large discontinuity limits the ultrasonic imaging efficiency, the safety of ionizing radiation limits the use of X rays, the constant temperature inside the human body leads to the reduction of the resolution of infrared thermal imaging, the portability of nuclear magnetic resonance is limited by the cost and the volume, and microwaves can play a unique role to obtain information which cannot be obtained by other imaging means.
The main current technical scheme is to adopt an active microwave imaging technology. The microwave imaging technology is divided into a passive type and an active type, wherein the passive type microwave imaging is carried out by detecting the self radiation of an object and the reflected background radiation thereof, an additional radiation source is not needed for irradiating the object to be detected, the contrast ratio of a passive type imaging result is poor, and the depth direction information cannot be provided; the active microwave imaging irradiates an object to be detected by using a radiation source, and a reflected signal or a transmitted signal of the object can be acquired in a coherent or incoherent mode, so that the active microwave imaging has higher dynamic range and radiation contrast ratio compared with passive microwave imaging, and can provide information in the depth direction. But the detection data accuracy of the current active microwave imaging technology is lower.
Disclosure of Invention
The embodiment of the application provides a microwave imaging method and system, a transmitting terminal, a receiving terminal and a computer readable medium.
In a first aspect, an embodiment of the present application provides a microwave imaging method, applied to a receiving terminal, where the method includes: in the process that a target to be detected is positioned at a center point and a receiving terminal makes a round along a target plane relative to the center point, a first microwave signal scattered by the target to be detected and first position information of the receiving terminal are acquired at fixed time; the target plane is a plane where a section to be measured of the target to be measured is located; performing spectrum analysis on the first microwave signal to obtain received spectrum data corresponding to the first position information; and carrying out inversion calculation according to the received frequency spectrum data corresponding to the first position information to obtain the image information of the target to be detected.
In a second aspect, an embodiment of the present application provides a microwave imaging method, applied to a transmitting terminal, where the method includes: generating a microwave signal for measuring a section to be measured according to a signal parameter corresponding to the section to be measured of a target to be measured; the signal parameters corresponding to the section to be measured are determined according to the characteristic information of the section to be measured; transmitting a microwave signal for measuring the section to be measured.
In a third aspect, an embodiment of the present application provides a transmitting terminal, including: at least one first processor; and the first memory is used for storing at least one program, and when the at least one program is executed by the at least one first processor, the microwave imaging method is realized.
In a fourth aspect, an embodiment of the present application provides a receiving terminal, including: at least one second processor; and a second memory having at least one program stored thereon, which when executed by the at least one second processor, implements any one of the above-described microwave imaging methods.
In a fifth aspect, embodiments of the present application provide a computer readable medium having a computer program stored thereon, which when executed by a processor, implements any of the above-described microwave imaging methods.
In a sixth aspect, an embodiment of the present application provides a microwave imaging system, including: the transmitting terminal is used for generating a microwave signal for measuring the section to be measured according to the signal parameter corresponding to the section to be measured of the target to be measured; the signal parameters corresponding to the section to be measured are determined according to the characteristic information of the section to be measured; transmitting a microwave signal for measuring the section to be measured; the receiving terminal is used for acquiring a first microwave signal scattered by the target to be detected and first position information of the receiving terminal at fixed time in the process that the target to be detected is positioned at the center point and the receiving terminal makes a circle along the target plane relative to the center point; the target plane is a plane where a section to be measured of the target to be measured is located; performing spectrum analysis on the first microwave signal to obtain received spectrum data corresponding to the first position information; and carrying out inversion calculation according to the received frequency spectrum data corresponding to the first position information to obtain the image information of the target to be detected.
The microwave imaging method applied to the receiving terminal provided by the embodiment of the application collects microwave signals based on the frequency domain sampling technology, solves the problem that a small-volume terminal device cannot be provided with a large-aperture antenna, solves the contradiction between the penetrating capacity and the resolution of a transmitting signal, reduces the requirement on the directivity of the transmitting antenna, and simultaneously reduces the requirement on the positioning precision; and, set up sender and receiver in different terminals, improved the usability of gathering data, improved the imaging precision greatly.
According to the microwave imaging method applied to the transmitting terminal, provided by the embodiment of the application, the microwave signal of the section to be detected is generated based on the characteristic information of the section to be detected of the target to be detected, so that the adaptability to different targets to be detected is improved, and the reliability is improved; and, set up sender and receiver in different terminals, improved the usability of gathering data, improved the imaging precision greatly.
Drawings
Fig. 1 is a flowchart of a microwave imaging method applied to a receiving terminal according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a two-dimensional cross-sectional imaging process in accordance with an embodiment of the present application;
FIG. 3 is a schematic diagram of a three-dimensional cross-sectional imaging process in accordance with an embodiment of the present application;
Fig. 4 is a flowchart of a microwave imaging method applied to a transmitting terminal according to another embodiment of the present application;
fig. 5 is a block diagram of a transmitting terminal according to another embodiment of the present application;
fig. 6 is a block diagram of a receiving terminal according to another embodiment of the present application;
Fig. 7 is a block diagram of a microwave imaging system according to another embodiment of the present application.
Detailed Description
In order to better understand the technical solutions of the present application, the following describes in detail the microwave imaging method and system, the transmitting and receiving terminal, and the computer readable medium provided by the present application with reference to the accompanying drawings.
Example embodiments will be described more fully hereinafter with reference to the accompanying drawings, but may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.
The embodiments of the application and features of the embodiments may be combined with each other without conflict.
As used herein, the term "and/or" includes any and all combinations of at least one of the associated listed items.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of at least one other feature, integer, step, operation, element, component, and/or group thereof.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present application and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Fig. 1 is a flowchart of a microwave imaging method applied to a receiving terminal according to an embodiment of the present application.
In a first aspect, referring to fig. 1, an embodiment of the present application provides a microwave imaging method applied to a receiving terminal, which may be a portable mobile terminal, here assumed to be a first mobile terminal, the method including:
Step 100, in the process that a target to be detected is located at a center point and a receiving terminal makes a round along a target plane relative to the center point, a first microwave signal scattered by the target to be detected and first position information of the receiving terminal are acquired at fixed time; the target plane is the plane where the section to be measured of the target to be measured is located.
In some exemplary embodiments, the path along which the receiving terminal makes one revolution along the target plane with respect to the center point may be a circle centered on the center point.
In some exemplary embodiments, the first location information is determined from first distance information and first angle data of the receiving terminal with respect to the center point.
In some exemplary embodiments, the first distance information may be obtained by ranging using an optoelectronic distance sensor, a millimeter wave distance sensor, or a capacitive distance sensor, and the first angle data may be obtained by measuring an angle using a gyroscope.
Step 101, performing spectrum analysis on the first microwave signal to obtain received spectrum data corresponding to the first position information.
In some exemplary embodiments, the received spectral data may be determined from electromagnetic field amplitude and phase, and may be a complex representation of the signal.
And 102, carrying out inversion calculation according to the received frequency spectrum data corresponding to the first position information to obtain image information of the target to be detected.
In some exemplary embodiments, before performing inversion calculation according to the received spectrum data corresponding to the first location information to obtain image information of the target to be measured, the method further includes: receiving transmitting frequency spectrum data sent by a transmitting terminal; the emission spectrum data are emission spectrum data corresponding to microwave signals which are emitted by the emission terminal and used for measuring the section to be measured.
In some exemplary embodiments, before performing inversion calculation according to the received spectrum data corresponding to the first location information to obtain image information of the target to be measured, the method further includes: receiving characteristic information of a section to be detected, which is input by a user; determining signal parameters corresponding to the section to be measured according to the characteristic information of the section to be measured; and determining emission spectrum data corresponding to the microwave signals for measuring the section to be measured according to the signal parameters corresponding to the section to be measured.
In some exemplary embodiments, before performing inversion calculation according to the received spectrum data corresponding to the first location information to obtain image information of the target to be measured, the method further includes: receiving signal parameters corresponding to the section to be detected, which are input by a user; and determining emission spectrum data corresponding to the microwave signals for measuring the section to be measured according to the signal parameters corresponding to the section to be measured.
In some exemplary embodiments, the determining the signal parameter corresponding to the section to be measured and the determining the transmitting spectrum data corresponding to the microwave signal for measuring the section to be measured are the same as the determining process of the transmitting terminal, which is not described herein.
In some exemplary embodiments, performing inversion calculation according to the received spectrum data corresponding to the first location information to obtain image information of the target to be measured includes: and carrying out inversion calculation according to the received spectrum data and the transmitted spectrum data corresponding to the first position information to obtain image information of the target to be detected.
In some exemplary embodiments, performing inversion calculation according to the received spectrum data corresponding to the first location information to obtain image information of the target to be measured includes: inversion calculation is carried out according to the received frequency spectrum data corresponding to the first position information to obtain dielectric constant distribution information of the cross section to be detected; generating a dielectric constant two-dimensional distribution diagram of the target to be measured according to the dielectric constant distribution information of the cross section to be measured; or carrying out inversion calculation according to the received frequency spectrum data corresponding to the first position information to obtain dielectric constant distribution information of the cross section to be measured; repeating the steps to obtain dielectric constant distribution information of at least two sections to be measured; and generating a dielectric constant three-dimensional distribution diagram of the target to be measured according to the dielectric constant distribution information of at least two sections to be measured.
In some exemplary embodiments, the first microwave signals and the first position information of different cross sections to be measured may be obtained by changing the detour path, or may be obtained by changing the position and/or the direction of the object to be measured.
In some exemplary embodiments, when the first microwave signal of each section to be measured is acquired, the receiving terminal needs to make a round along the corresponding target plane relative to the center point, and the shape and the size of the round path corresponding to the different sections to be measured may be the same or different.
According to the microwave imaging method provided by the embodiment of the application, the microwave signals are acquired based on the frequency domain sampling technology, so that the problem that a small-volume terminal device cannot be provided with a large-aperture antenna is solved, the contradiction between the penetrating capacity and the resolution of the transmitted signals is solved, the requirement on the directivity of the transmitted antenna is reduced, and the requirement on the positioning precision is reduced; and, set up sender and receiver in different terminals, improved the usability of gathering data, improved the imaging precision greatly.
In some exemplary embodiments, before inversion calculation is performed according to the received spectrum corresponding to the first position information to obtain dielectric constant distribution information of the section to be measured, the method further includes: in the process that the object to be detected is not in a closed graph formed by the surrounding path, and the receiving terminal makes a round along the object plane relative to the center point, acquiring a second microwave signal of the environment and second position information of the receiving terminal at fixed time; performing spectrum analysis on the second microwave signal to obtain received spectrum data corresponding to the second position information; subtracting the received spectrum data corresponding to the second position information closest to the first position information from the received spectrum data corresponding to the first position information to obtain spectrum difference data; performing inversion calculation according to the received spectrum data corresponding to the first position information to obtain image information of the target to be detected comprises the following steps: and carrying out inversion calculation according to the frequency spectrum difference data to obtain the image information of the target to be detected.
That is, the reception spectrum data is obtained by two measurements in front and back, as shown in fig. 2 and 3, in the first measurement, the object to be measured is not placed inside the closed pattern enclosed by the detour path, the transmitting terminal transmits the generated microwave signal for measuring the section to be measured, and in the process that the receiving terminal detours along the object plane with respect to the center point, the second microwave signal and the second position information are obtained at regular time as the data set a; then, carrying out second measurement, placing a target to be measured at the center point, and regularly acquiring a first microwave signal and first position information as a data set B in the process that the receiving terminal makes a circle along the target plane relative to the center point; when acquiring the data set a and the data set B, the shape and the size of the detour path of the receiving terminal should be kept consistent as much as possible for subsequent data processing. After the data set A and the data set B are obtained, the received frequency spectrum data in the data set A and the data set B which are closest to each other are subtracted to obtain frequency spectrum difference data excluding environmental noise, the frequency spectrum difference data and corresponding first position information or second position information are stored as the data set C, inversion is carried out on the frequency spectrum difference data in the data set C to obtain dielectric constant information, dielectric constant distribution information of a section to be measured is obtained based on the dielectric constant information and the first position information or the second position information in the data set C, and a corresponding two-dimensional or three-dimensional image can be drawn based on the dielectric constant distribution information.
In some exemplary embodiments, the received spectrum data corresponding to the first location information may be obtained first, and then the received spectrum data corresponding to the second location information may be obtained; the received spectrum data corresponding to the second location information may be obtained first, and then the received spectrum data corresponding to the first location information may be obtained.
In some exemplary embodiments, the second location information is determined from second distance information and second angle data of the receiving terminal with respect to the center point.
In some exemplary embodiments, a gyroscope may be used to make the angle measurement to obtain the second angle data.
In some exemplary embodiments, when the object to be measured is not inside the closed pattern enclosed by the detour path, the photoelectric distance sensor, the millimeter wave distance sensor or the capacitive distance sensor cannot be used for ranging to obtain the second distance information, and then when the relative center point in the receiving makes one round along the object plane, the object can move along the radius direction from the center point, and then make one round along the object plane relative to the center point, so that the second distance information can be calculated according to the distance information of the detour path. For example, the detour path is approximated to a circle centered on the center point, an equation of the circle is fitted according to the coordinate information of the points on the detour path, the radius of the circle is calculated according to the equation of the circle, and the radius of the circle is the second distance information. For another example, the coordinate information of the first point on the detour path and the coordinate information of the last D points on the detour path may be taken, the distance information between each of the first point and the last D points is calculated, and the average value of the distance information corresponding to the D points is used as the second distance information.
In some exemplary embodiments, for the acquisition of the first microwave signal and the second microwave signal of the same section to be measured, the shape and the size of the bypass path should be ensured to be consistent as much as possible so as to improve the measurement accuracy.
In some exemplary embodiments, interference of environmental noise is accounted for by measuring twice before and after, and accuracy of measurement is improved.
Fig. 4 is a flowchart of a microwave imaging method applied to a transmitting terminal according to another embodiment of the present application.
In a second aspect, referring to fig. 4, another embodiment of the present application provides a microwave imaging method applied to a transmitting terminal, which may be a dedicated hardware device or a second mobile terminal, the method including:
step 400, generating a microwave signal for measuring the section to be measured according to the signal parameter corresponding to the section to be measured of the target to be measured; and determining signal parameters corresponding to the section to be measured according to the characteristic information of the section to be measured.
In some exemplary embodiments, the signal parameters corresponding to the section to be measured include: center frequency, transmitting power and signal type corresponding to the section to be measured.
In some exemplary embodiments, the signal types include: at least one of a single frequency microwave signal, a narrowband linear modulated microwave signal, a multi-frequency point microwave signal, and a wideband modulated microwave signal.
In some exemplary embodiments, a single frequency microwave signal refers to a microwave signal corresponding to a certain frequency point.
In some exemplary embodiments, a narrowband linearly modulated microwave signal refers to a signal obtained by modulating a narrowband signal onto a high frequency carrier. The high frequency carrier wave is here a microwave signal, and the narrowband signal may be a signal of some specific waveform, such as a sa function wave.
In some exemplary embodiments, the multi-frequency-point microwave signal refers to a microwave signal including at least two frequency points in the frequency domain.
In some exemplary embodiments, a width modulated microwave signal refers to a signal obtained by modulating a broadband signal onto a high frequency carrier. The high frequency carrier wave is a microwave signal, and the width signal may be a signal with some specific waveform, such as a sa function wave.
In some exemplary embodiments, the characteristic information of the section to be measured includes: size information and type of the section to be measured.
In some exemplary embodiments, the types of cross-sections to be measured include: the maximum value of the dielectric constant difference of the component parts of the section to be measured is larger than or equal to a first preset threshold value, or the maximum value of the conductivity difference is larger than or equal to a second preset threshold value; or the type of the section to be measured is that the maximum value of the dielectric constant difference is smaller than a first preset threshold value, and the maximum value of the conductivity difference is smaller than a second preset threshold value.
In some exemplary embodiments, the maximum value of the conductivity difference of the component of the cross section under test is the difference between the maximum value of the conductivity of the component of the cross section under test and the minimum value of the conductivity of the component of the cross section under test.
In some exemplary embodiments, the maximum value of the conductivity difference of the component of the cross section under test is the difference between the maximum value of the conductivity of the component of the cross section under test and the minimum value of the conductivity of the component of the cross section under test.
In some exemplary embodiments, the radio frequency modulation circuit may generate the section to be measured according to the center frequency and the signal type corresponding to the section to be measured to obtain the microwave signal, and the radio frequency power amplifier circuit adjusts the transmitting power of the generated microwave signal.
In some exemplary embodiments, the frequency point of the generated microwave signal is different from the electromagnetic frequency point already occupied in the current space.
In some exemplary embodiments, before generating the microwave signal for measuring the section to be measured according to the signal parameter corresponding to the section to be measured of the target to be measured, the method further includes: and determining signal parameters corresponding to the section to be measured according to the characteristic information of the section to be measured of the target to be measured.
In some exemplary embodiments, determining the signal parameter corresponding to the section to be measured according to the characteristic information of the section to be measured of the target to be measured includes: determining the center frequency and the transmitting power corresponding to the section to be measured according to the size information of the section to be measured; and determining the signal type corresponding to the section to be measured according to the type of the section to be measured.
In some exemplary embodiments, the dimensional information of the cross section to be measured includes: at least one of diameter information of an circumscribed circle and side length information of an circumscribed square.
In some exemplary embodiments, determining a center frequency corresponding to the cross section to be measured from the dimensional information of the cross section to be measured includes: and determining the size information of the section to be measured, of which the center frequency is greater than or equal to 0.1 time and less than or equal to 10 times, corresponding to the section to be measured.
In some exemplary embodiments, determining the transmit power corresponding to the cross section to be measured from the size information of the cross section to be measured includes: and searching the transmitting power corresponding to the size information of the section to be detected in the corresponding relation between the preset size information and the transmitting power.
In some exemplary embodiments, determining the type of signal corresponding to the section under test based on the type of section under test includes at least one of: when the type of the section to be measured is that the maximum value of the dielectric constant difference value of the component parts of the section to be measured is larger than or equal to a first preset threshold value or the maximum value of the conductivity difference value is larger than or equal to a second preset threshold value, determining that the signal type corresponding to the section to be measured is a single-frequency microwave signal or a narrowband linear modulation microwave signal; and determining that the signal type corresponding to the section to be measured is a multi-frequency-point microwave signal or a broadband modulation microwave signal under the condition that the type of the section to be measured is that the maximum value of the dielectric constant difference is smaller than a first preset threshold value and the maximum value of the conductivity difference is smaller than a second preset threshold value.
Step 401, transmitting a microwave signal for measuring a section to be measured.
In some exemplary embodiments, after transmitting the microwave signal for measuring the cross section under test, the method further comprises: and transmitting the transmitted frequency spectrum data corresponding to the transmitted microwave signals to a receiving terminal.
According to the microwave imaging method applied to the transmitting terminal, provided by the embodiment of the application, the microwave signal of the section to be detected is generated based on the characteristic information of the section to be detected of the target to be detected, so that the adaptability to different targets to be detected is improved, and the reliability is improved; and, set up sender and receiver in different terminals, improved the usability of gathering data, improved the imaging precision greatly.
In a third aspect, referring to fig. 5, another embodiment of the present application provides a transmitting terminal, including: at least one first processor 501; the first memory 502, the first memory 502 stores at least one program, and when the at least one program is executed by the at least one first processor 501, any one of the above-described microwave imaging methods is implemented.
In some exemplary embodiments, the transmitting terminal further comprises: a transmit signal modulation module 503 for generating a microwave signal for measuring the cross section to be measured under the control of the first processor 501.
In some exemplary embodiments, the transmit signal modulation module 503 may be comprised of a radio frequency power amplifier circuit.
In some exemplary embodiments, the transmit signal modulation module 503 is specifically configured to: and receiving the center frequency and the signal type corresponding to the section to be measured sent by the first processor 501, and generating a microwave signal for measuring the section to be measured according to the center frequency and the signal type corresponding to the section to be measured.
In some exemplary embodiments, the transmitting terminal further comprises: a transmit power control module 504 for modulating the transmit power of the microwave signal under the control of the first processor 501.
In some exemplary embodiments, the transmit power control module 504 may be comprised of a radio frequency power amplifier circuit, and the first processor may implement the adjustment of the transmit power of the microwave signal by adjusting the gain of the radio frequency power amplifier circuit.
In some exemplary embodiments, the transmit power control module 504 is specifically configured to: the transmission power of the section to be measured sent by the first processor 501 is received, and the transmission power of the microwave signal is adjusted according to the transmission power of the section to be measured.
In some exemplary embodiments, the transmitting terminal further comprises: a first antenna 505 for transmitting microwave signals under the control of the first processor 501.
In some example embodiments, the first antenna 505 may be implemented with an antenna for data communications.
In some exemplary embodiments, the transmitting terminal further comprises: the first input module 506 is configured to receive the characteristic information of the section to be measured or the signal parameter corresponding to the section to be measured, which is input by the user, under the control of the first processor 501, and send the characteristic information of the section to be measured or the signal parameter corresponding to the section to be measured to the first processor 501.
In some example embodiments, the first input module 506 may be at least one of a keyboard, a mouse, a touch screen, or a universal serial bus (USB, universal Serial Bus) interface, etc.
In some exemplary embodiments, the transmitting terminal further comprises: and the power supply module 507 is used for supplying power to other modules.
In some example embodiments, the power module 507 may be at least one of a dry cell battery or a rechargeable battery.
In some exemplary embodiments, the transmitting terminal further comprises: one or more first I/O interfaces 508, coupled between the first processor 501 and the first memory 502, are configured to enable information interaction of the first processor 501 with the first memory 502.
Wherein the first processor 501 is a device having data processing capabilities, including but not limited to a Central Processing Unit (CPU) or the like; the first memory 502 is a device with data storage capability including, but not limited to, random access memory (RAM, more specifically SDRAM, DDR, etc.), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), FLASH memory (FLASH); a first I/O interface (read/write interface) 508 is connected between the first processor 501 and the first memory 502, and enables information interaction between the first processor 501 and the first memory 502, which includes, but is not limited to, a data Bus (Bus), and the like.
In some embodiments, first processor 501, first memory 502, and first I/O interface 508 are connected to each other, and thus to other components of the computing device, by a first bus 509.
Fourth aspect, referring to fig. 6, another embodiment of the present application provides a receiving terminal including: at least one second processor 601; and a second memory 602, wherein the second memory 602 stores at least one program, and when the at least one program is executed by the at least one second processor 601, any one of the above-mentioned microwave imaging methods is implemented.
In some exemplary embodiments, the receiving terminal further comprises: a second antenna 603 for receiving the first microwave signal or the second microwave signal under the control of the second processor 601.
In some example embodiments, the second antenna 603 may be an antenna for data communication.
In some exemplary embodiments, the receiving terminal further comprises: the spectrum analysis module 604 is configured to perform spectrum analysis on the first microwave signal or the second microwave signal under the control of the second processor 601 to obtain corresponding received spectrum data.
In some exemplary embodiments, the receiving terminal further comprises: the distance detection module 605 is configured to obtain the first location information under the control of the second processor 601.
In some exemplary embodiments, the distance detection module 605 may be an electro-optical distance measurement module, a millimeter wave distance measurement module, a capacitive distance sensor, or the like.
In some exemplary embodiments, the receiving terminal further comprises: the angle detection module 606 is configured to obtain the first angle data or the second angle data under the control of the second processor 601.
In some exemplary embodiments, the angle detection module 606 may be a gyroscope.
In some exemplary embodiments, the receiving terminal further comprises: the power management module 607 is used to supply power to other modules.
In some exemplary embodiments, the power management module 607 may be comprised of a battery, a charge control module, and an operational power control module.
In some exemplary embodiments, the receiving terminal further comprises: the second input module 608 is configured to obtain, under control of the second processor 601, the characteristic information of the section to be measured or the signal parameter corresponding to the section to be measured, which is input by the user, and send the characteristic information of the section to be measured or the signal parameter corresponding to the section to be measured to the second processor 601.
In some exemplary embodiments, the second input module 608 may be at least one of a touch screen, a mouse, a keyboard, or a sensor, among others.
In some exemplary embodiments, the receiving terminal further comprises: a display module 609 for displaying a two-dimensional distribution map or a three-dimensional distribution map of the dielectric constant of the object to be measured.
In some exemplary embodiments, the display module 609 may be at least one of a display screen, a light emitting diode, a projector, or the like.
In some exemplary embodiments, the receiving terminal further comprises: one or more second I/O interfaces 610, coupled between the second processor 601 and the second memory 602, are configured to enable information interaction of the second processor 601 with the second memory 602.
Wherein the second processor 601 is a device having data processing capabilities including, but not limited to, a Central Processing Unit (CPU) or the like; the second memory 602 is a device with data storage capability including, but not limited to, random access memory (RAM, more specifically SDRAM, DDR, etc.), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), FLASH memory (FLASH); a second I/O interface (read/write interface) 610 is connected between the second processor 601 and the second memory 602, and enables information interaction between the second processor 601 and the second memory 602, which includes, but is not limited to, a data Bus (Bus) and the like.
In some embodiments, the second processor 601, the second memory 602, and the second I/O interface 610 are connected to each other and thus to other components of the computing device by a second bus 611.
In a fifth aspect, another embodiment of the present application provides a computer readable medium having a computer program stored thereon, which when executed by a processor, implements any of the above-described microwave imaging methods.
Fig. 7 is a block diagram of a microwave imaging system according to another embodiment of the present application.
In a sixth aspect, referring to fig. 7, another embodiment of the present application provides a microwave imaging system, comprising: the transmitting terminal 701 is configured to generate a microwave signal for measuring a section to be measured according to a signal parameter corresponding to the section to be measured of the target to be measured; the signal parameters corresponding to the section to be measured are determined according to the characteristic information of the section to be measured; transmitting a microwave signal for measuring a section to be measured; the receiving terminal 702 is configured to obtain, at regular time, a first microwave signal scattered by the target to be measured and first position information of the receiving terminal in a process that the target to be measured is located at a center point and the receiving terminal makes a circle along a target plane with respect to the center point; the target plane is a plane where a section to be measured of the target to be measured is located; performing spectrum analysis on the first microwave signal to obtain received spectrum data corresponding to the first position information; and carrying out inversion calculation according to the received frequency spectrum data corresponding to the first position information to obtain the image information of the target to be detected.
In some exemplary embodiments, the transmitting terminal 701 is further configured to: and determining signal parameters corresponding to the section to be measured according to the characteristic information of the section to be measured of the target to be measured.
In some exemplary embodiments, the transmitting terminal 701 is further configured to: determining the center frequency and the transmitting power corresponding to the section to be measured according to the size information of the section to be measured; and determining the signal type corresponding to the section to be detected according to the type of the section to be detected.
In some exemplary embodiments, the transmitting terminal 701 is configured to determine a center frequency corresponding to the section to be measured according to the size information of the section to be measured in the following manner: and determining the size information of the section to be measured, of which the center frequency is greater than or equal to 0.1 time and less than or equal to 10 times, corresponding to the section to be measured.
In some exemplary embodiments, the transmitting terminal 701 is configured to determine a signal type corresponding to the section to be measured according to the type of the section to be measured in at least one of the following manners: when the type of the section to be measured is that the maximum value of the dielectric constant difference value of the component parts of the section to be measured is larger than or equal to a first preset threshold value or the maximum value of the conductivity difference value is larger than or equal to a second preset threshold value, determining that the signal type corresponding to the section to be measured is a single-frequency microwave signal or a narrowband linear modulation microwave signal; and determining that the signal type corresponding to the section to be detected is a multi-frequency-point microwave signal or a broadband modulation microwave signal under the condition that the type of the section to be detected is that the maximum value of the dielectric constant difference is smaller than the first preset threshold value and the maximum value of the conductivity difference is smaller than the second preset threshold value.
In some exemplary embodiments, the transmitting terminal 701 is further configured to: and transmitting the transmitted frequency spectrum data corresponding to the transmitted microwave signals to a receiving terminal.
The receiving terminal 702 is further configured to: receiving transmitting frequency spectrum data sent by a transmitting terminal; and carrying out inversion calculation according to the received spectrum data and the transmitted spectrum data corresponding to the first position information to obtain dielectric constant distribution information of the section to be measured.
In some exemplary embodiments, the receiving terminal 702 is further configured to: in the process that the object to be detected is not in a closed graph formed by the surrounding path, and the receiving terminal makes a circle along the object plane relative to the center point, acquiring a second microwave signal of the environment and second position information of the receiving terminal at fixed time; performing spectrum analysis on the second microwave signal to obtain received spectrum data corresponding to the second position information; subtracting the received spectrum data corresponding to the second position information closest to the first position information from the received spectrum data corresponding to the first position information to obtain spectrum difference data; and carrying out inversion calculation according to the frequency spectrum difference data to obtain the image information of the target to be detected.
The specific implementation process of the microwave imaging system is the same as that of the microwave imaging method in the foregoing embodiment, and will not be described herein.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, functional modules/units in the apparatus, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should be interpreted in a generic and descriptive sense only and not for purpose of limitation. In some instances, it will be apparent to one skilled in the art that features, characteristics, and/or elements described in connection with a particular embodiment may be used alone or in combination with other embodiments unless explicitly stated otherwise. It will therefore be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the scope of the present application as set forth in the following claims.
Claims (15)
1. A microwave imaging method applied to a receiving terminal, the method comprising:
in the process that a target to be detected is positioned at a center point and a receiving terminal makes a round along a target plane relative to the center point, a first microwave signal scattered by the target to be detected and first position information of the receiving terminal are acquired at fixed time; the target plane is a plane where a section to be measured of the target to be measured is located;
performing spectrum analysis on the first microwave signal to obtain received spectrum data corresponding to the first position information;
and carrying out inversion calculation according to the received frequency spectrum data corresponding to the first position information to obtain the image information of the target to be detected.
2. The microwave imaging method according to claim 1, wherein before the inversion calculation is performed according to the received spectrum data corresponding to the first position information to obtain the image information of the target to be measured, the method further includes:
in the process that the object to be detected is not in a closed graph formed by the surrounding path, and the receiving terminal makes a circle along the object plane relative to the center point, acquiring a second microwave signal of the environment and second position information of the receiving terminal at fixed time;
performing spectrum analysis on the second microwave signal to obtain received spectrum data corresponding to the second position information;
subtracting the received spectrum data corresponding to the second position information closest to the first position information from the received spectrum data corresponding to the first position information to obtain spectrum difference data;
the step of performing inversion calculation according to the received spectrum data corresponding to the first position information to obtain image information of the target to be detected includes: and carrying out inversion calculation according to the spectrum difference data to obtain the image information of the target to be detected.
3. The microwave imaging method of claim 2, wherein the second position information is determined from second distance information and second angle data of the receiving terminal with respect to the center point.
4. The microwave imaging method according to claim 1, wherein the performing inversion calculation according to the received spectrum data corresponding to the first position information to obtain the image information of the target to be measured includes:
Performing inversion calculation according to the received frequency spectrum data corresponding to the first position information to obtain dielectric constant distribution information of the cross section to be detected; generating a dielectric constant two-dimensional distribution map of the target to be measured according to the dielectric constant distribution information of the cross section to be measured;
Or carrying out inversion calculation according to the received frequency spectrum data corresponding to the first position information to obtain dielectric constant distribution information of the cross section to be detected; repeating the steps to obtain dielectric constant distribution information of at least two sections to be measured; and generating a dielectric constant three-dimensional distribution diagram of the target to be measured according to the dielectric constant distribution information of at least two sections to be measured.
5. The microwave imaging method according to claim 1, wherein before the inversion calculation is performed according to the received spectrum data corresponding to the first position information to obtain the image information of the target to be measured, the method further includes:
Receiving transmitting frequency spectrum data sent by a transmitting terminal; the emission spectrum data are emission spectrum data corresponding to the microwave signals which are emitted by the emission terminal and used for measuring the section to be measured;
the step of performing inversion calculation according to the received spectrum data corresponding to the first position information to obtain a dielectric constant distribution image of the section to be measured includes: and carrying out inversion calculation according to the received spectrum data and the emitted spectrum data corresponding to the first position information to obtain the image information of the target to be detected.
6. The microwave imaging method according to any one of claims 1-5, wherein the first location information is determined according to first distance information and first angle data of the receiving terminal with respect to the center point.
7. A microwave imaging method applied to a transmitting terminal, the method comprising:
Generating a microwave signal for measuring a section to be measured according to a signal parameter corresponding to the section to be measured of a target to be measured; the signal parameters corresponding to the section to be measured are determined according to the characteristic information of the section to be measured;
transmitting a microwave signal for measuring the section to be measured.
8. The microwave imaging method according to claim 7, wherein before the generating the microwave signal for measuring the section to be measured according to the signal parameter corresponding to the section to be measured of the object to be measured, the method further comprises:
determining the center frequency and the transmitting power corresponding to the section to be measured according to the size information of the section to be measured;
And determining the signal type corresponding to the section to be detected according to the type of the section to be detected.
9. The microwave imaging method of claim 8, wherein the determining the center frequency corresponding to the section to be measured according to the size information of the section to be measured comprises:
And determining the size information of the section to be measured, of which the center frequency is greater than or equal to 0.1 time and less than or equal to 10 times, corresponding to the section to be measured.
10. The microwave imaging method of claim 8, wherein the determining the signal type corresponding to the section to be measured according to the type of the section to be measured comprises at least one of:
When the type of the section to be measured is that the maximum value of the dielectric constant difference value of the component parts of the section to be measured is larger than or equal to a first preset threshold value or the maximum value of the conductivity difference value is larger than or equal to a second preset threshold value, determining that the signal type corresponding to the section to be measured is a single-frequency microwave signal or a narrowband linear modulation microwave signal;
And determining that the signal type corresponding to the section to be detected is a multi-frequency-point microwave signal or a broadband modulation microwave signal under the condition that the type of the section to be detected is that the maximum value of the dielectric constant difference is smaller than the first preset threshold value and the maximum value of the conductivity difference is smaller than the second preset threshold value.
11. A microwave imaging method according to any one of claims 7-10, wherein after said transmitting the microwave signal for measuring the cross-section under test, the method further comprises:
And transmitting the transmitted frequency spectrum data corresponding to the transmitted microwave signals to a receiving terminal.
12. A transmitting terminal, comprising:
At least one first processor;
a first memory having at least one program stored thereon, which when executed by the at least one first processor, implements the microwave imaging method of any of claims 1-6.
13. A receiving terminal, comprising:
at least one second processor;
a second memory having at least one program stored thereon, which when executed by the at least one processor, implements the microwave imaging method of any of claims 7-11.
14. A computer readable medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the microwave imaging method of any of claims 1-11.
15. A microwave imaging system, comprising:
The transmitting terminal is used for generating a microwave signal for measuring the section to be measured according to the signal parameter corresponding to the section to be measured of the target to be measured; the signal parameters corresponding to the section to be measured are determined according to the characteristic information of the section to be measured; transmitting a microwave signal for measuring the section to be measured;
The receiving terminal is used for acquiring a first microwave signal scattered by the target to be detected and first position information of the receiving terminal at fixed time in the process that the target to be detected is positioned at the center point and the receiving terminal makes a circle along the target plane relative to the center point; the target plane is a plane where a section to be measured of the target to be measured is located; performing spectrum analysis on the first microwave signal to obtain received spectrum data corresponding to the first position information; and carrying out inversion calculation according to the received frequency spectrum data corresponding to the first position information to obtain the image information of the target to be detected.
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| CN202211637385.3A CN118226444A (en) | 2022-12-19 | 2022-12-19 | Microwave imaging method and system, transmitting and receiving terminal, and computer readable medium |
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