CN105629205A - Radar receiving front-end self-adaptive protection switch control method and circuit - Google Patents
Radar receiving front-end self-adaptive protection switch control method and circuit Download PDFInfo
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- CN105629205A CN105629205A CN201510991961.8A CN201510991961A CN105629205A CN 105629205 A CN105629205 A CN 105629205A CN 201510991961 A CN201510991961 A CN 201510991961A CN 105629205 A CN105629205 A CN 105629205A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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- Computer Networks & Wireless Communication (AREA)
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- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
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- Radar Systems Or Details Thereof (AREA)
Abstract
The invention relates to a radar receiving front-end self-adaptive protection switch control method and circuit. Signals received by a receiving front-end in the turn-on period of a receiver are coupled by a coupler and then high-level and low-level signals are outputted through demodulation and voltage comparison, logical operation is performed on the high-level and low-level signals and level control signals of a radar system protection switch, and the on/off state of the radar receiving protection switch is controlled by the operation result in a driving level form so that the receiving front-end can be protected from being burned out by high-power signals in the receiving period.
Description
Technical field
The present invention relates to the design of radar receiver front end, specifically by circuit such as the coupling mechanism in appropriate design front-end protection on-off control circuit, wave-detector, voltage comparator and logical operation devices, reach the radar receiving front-end protection function of switch from main control.
Background technology
Receiving front-end is positioned at radar receiving system foremost, and its stuctures and properties directly affects whole receiving system. Receiving front-end receives the various signals from outside or radar inside, and will send into subsequent conditioning circuit after signal processing. When receiving front-end receives relatively high power signal, it is easy to make whole receiving apparatus enter saturated, even when power reaches certain limit, it is possible to burn receiving front-end or receiving apparatus. When radar is operated in transmitting state, emitter is leaked to the strength of signal of receiving front-end big, can affect receiving apparatus normal operation; Or when the external world has the Received signal strength of relatively high power to input, operation of receiver also can be affected. Therefore, receiving front-end must design a protection switch, and when radar emission signal, protection switch disconnects, and receiving apparatus is protected, when signal do not launched by radar, and protection switch conducting, receiving apparatus normal operation. Disconnection or the conducting state of receiving apparatus are controlled as required by radar system.
When tradition radar is operated in reception state, protection switch conducting, if receiving high-power signal, receiving front-end must send turn-off protection switch instruction by radar control system after wait-receiving mode system processing signals, and now, receiving front-end may be damaged. Therefore; must design a kind of can Real-Time Monitoring Received signal strength is strong and weak and rapid reaction the circuit of Control protection switch; this circuit is after receiving high-power unwanted signals, it is not necessary to radar system send turn off instruction just can autonomous turn-off protection switch fast, protection radar front end is not burnt.
Receiving apparatus front-end protection switch adaptive guard circuit according to the size of Received signal strength, on the basis of radar system Control protection switch conducting, according to protective condition, can disconnect protection switch, reach protection object fast. This circuit devcie integrated level height, cost is low, and volume is little, can be applicable to the radar receiving front-end of multiple frequency range, greatly improves the reliability of radar system, reduces radar maintenance cost, has good application prospect.
Summary of the invention
The technical problem solved
Can not carrying out large-signal in time judging and turn-off protection switch to solve receiving front-end between the take over period, thus cause whole receiving system to be subject to the problems such as impact, the present invention proposes a kind of radar receiving front-end adaptive guard method of controlling switch and circuit.
Technical scheme
A kind of radar receiving front-end adaptive guard method of controlling switch; it is characterized in that: receiving front-end is when being in reception state; in real time Received signal strength and detection threshold are compared: if Received signal strength is higher than detection threshold, turn off receiving front-end protection switch, if Received signal strength is lower than detection threshold, continue to keep protection switch conducting state.
A kind of radar receiving front-end adaptive guard on-off control circuit, it is characterised in that comprise coupling mechanism, wave-detector, voltage comparator and logical operation device; The Received signal strength being coupled out is sent into wave-detector by coupling mechanism; the Received signal strength being coupled out is carried out level detection outputs level signals by wave-detector; level signal and detection threshold are compared computing output switch level signal by voltage comparator, and the switch controlling signal of switch level Signals & Systems is carried out logical operation and outputs a control signal to protection switch by logical operation device.
Described coupling mechanism is the coupling mechanism of waveguide or planar circuit.
Described wave-detector is WJ0001.
Described voltage comparator is MAX961ESA.
Described logical operation device is SN74ALS21.
Useful effect
A kind of radar receiving front-end adaptive guard method of controlling switch that the present invention proposes and circuit; under the prerequisite meeting radar front end protection on off system normal operation; solve receiving front-end between the take over period very well can not carry out large-signal in time judging and turn-off protection switch, thus cause whole receiving system to be subject to the problems such as impact.
Accompanying drawing explanation
The hardware of Fig. 1 implementation of the present invention forms functional block diagram
One example embodiment schematic diagram of Fig. 2 implementation of the present invention
Embodiment
Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:
The present invention adds from main control circuit part on the basis of original protection on-off control circuit, and the switch controlling signal acting in conjunction that can send with radar system is in front-end protection switch. Circuit is primarily of coupling mechanism, wave-detector, voltage comparator and logical operation device composition. Coupling mechanism is for Received signal strength is sent into wave-detector carries out signal demodulator process in real time, the signal being coupled out is carried out level detection by wave-detector, and in voltage comparator, comparing computing with the level value set, its result is sent with the form of height two kinds of level. The high lower level sent then carries out Control protection switch after computing with the switch controlling signal from system in logical operation device.
Radar receiver front end adaptive guard switch circuit; receiving front-end is when being in reception state; can according to the signal power size received; real-time judge also controls the break-make that receiving front-end protects switch automatically; receiving front-end protection switch is then turned off for the signal higher than detection threshold; signal lower than thresholding then continues to keep protection switch conducting state, and the process of protection receiving front-end does not need to send instruction through radar system. The present invention is on the basis of the function of tradition radar receiver front-end protection switch; add the function of the power of autonomous monitor in real time Received signal strength; according to the signal power Control protection Head switches work received; do not need to send through radar system to turn off instruction; increasing reliability and the autonomy of radar protection function, the protection function improving radar receiving front-end can not from the problem of main protection during conducting.
Radar receiving front-end protection switch controls by radar system, is in disconnection state, is in conducting state between the take over period during launching. Tradition radar front end protection switch is only by the single control from radar system, and between the take over period, front-end protection switch is in conducting state always, if receiving the interference of large-signal, it is easy to cause receiving apparatus saturated, more serious meeting causes receiving front-end to be burnt. The present invention adopts the work of the technical controlling front-end protection switch that Systematical control signal and receiving front-end protect signal to combine in real time. The signal power that radar receiver receives can feed back to the protection switch of front end in real time by Threshold detection circuit, avoids radar receiving front-end only by Systematical control, independently can not evade the impact of high-power signal and the problem of destruction between the take over period in time. Therefore, radar front end protection on off system applying this invention is compared traditional system and is had protecting control effect safer, more independent and flexible.
Adaptive guard on-off control circuit core is to have whether a set of Received signal strength that can detect in real time exceeds thresholding and by result feedback to the circuit of switch controlling signal, circuit is primarily of coupling mechanism, wave-detector, voltage comparator and logical operation device composition. Coupling mechanism is for Received signal strength is sent into wave-detector carries out signal demodulator process in real time, the signal being coupled out is carried out level detection by wave-detector, and in voltage comparator, comparing computing with the level value set, its result is sent with the form of height two kinds of level. The high lower level sent then carries out Control protection switch after computing with the switch controlling signal from system in logical operation device. Judgement thresholding for received signal power size compares level at voltage comparator by arranging and determines, this makes receiving apparatus have threshold power flexibly, it is possible to setting as required different needs the signal power value turning off switch.
The pilot circuit of the realization of the present invention is specific as follows:
L () is by reasonably designing coupling mechanism, it is possible to calculate the power size from receiving front-end Received signal strength. Coupling mechanism can adopt various ways, and the coupling mechanism of waveguide or planar circuit all can use. Waveguide-coupled device is had in the end and be transformed into planar circuit and just can carry out Threshold detection and compare most. According to different radar parameter setting, the coupling mechanism that the design of Simulation degree of coupling is different, ensure the stability of its coupling index.
(2) signal adopting wave-detector to be coupled out front end carries out detection, and result exports with level form. Suitable wave-detector is selected according to different application bands. As required, if the level after detection is less, it is not enough to drive the voltage comparator circuit of rear class, then after wave-detector, increases the negative feedback amplifier circuit of one-level operational amplifier composition, power-level detector signal is amplified, ensures that the signal of detection has enough level to compare thresholding in order to trigger.
(3) detection threshold is set by voltage comparator, and threshold value by calculating a level value determined, and should be arranged in voltage comparator. Voltage comparator should select high speed comparer, and the time of response should control to ensure the reaction times of whole system in ns rank. The comparison voltage of usual voltage comparator, by determining at the resistance comparing end connection corresponding, compares end and is chosen as in-phase input end or reverse input terminus. If to compare voltage be in-phase end is in setting, when input voltage is higher than, when comparing voltage (thresholding voltage), comparer exports a high level, when lower than when comparing voltage, then exporting lower level; The situation of reverse input terminus is then completely contrary. The high lower level exported should have the equal voltage range of the protection switch controlling signal that can send with system, ensures the normal operation of logical operation function.
(4) arithmetic logic of logical operation device should be sent by the output logic of voltage comparator, radar system steering logic and the steering logic of protection switch determine jointly, calculate the logical circuit that use according to different combinations. The fan-out capability of logical operation device should have the voltage and current capacity that drive protection needed for switch. Logical operation device needs the time of response fast equally, control signal to be responded fast, and reduces the mistake that logical circuit produces due to time delay.
The control method concrete steps that the present invention realizes are as follows:
Step 1: receiving front-end, when being in reception state, is coupled in real time to received signal;
Step 2: the Received signal strength being coupled out is carried out level detection outputs level signals;
Step 3: the level signal of output and detection threshold are compared computing output switch level signal: if the level signal exported is higher than detection threshold, then export high level; If the level signal exported is lower than detection threshold, then export lower level; Described detection threshold is arranged according to the signal power value of turn-off protection switch;
Step 4: the switch controlling signal of the switch level Signals & Systems of output exports the signal of Control protection switch after carrying out logical operation: if output switch level signal is high level, the signal exporting Control protection switch turns off receiving front-end protection switch, if output switch level signal is lower level, the signal not exporting Control protection switch continues to keep protection switch conducting state.
Fig. 2 provides a Ka band radar receiving front-end protection switch circuit embodiment of the present invention. Functional block diagram can be found out as shown in Figure 2; signal from antenna is coupled by probe in the waveguide; signal after coupling carries out detection process through " WJ0001 " detector diode; after the in-phase end sending into " MAX961ESA " voltage comparator after microwave signal detection is become level signal and the thresholding voltage arranged by resistance R2 compare; result is exported to " SN74ALS21 " and door logical device with "+5V " or " 0V " signal form, after carrying out logical operation with the protection switch controlling signal from radar system, controls the on off state of front-end protection switch. In circuit, waveguide probe performs coupling mechanism function, and detector diode and peripheral circuit perform wave-detector function, perform logical operation device function with door.
The present invention is intended to tradition radar receiving front-end protection switch from the problem of main protection between the take over period, can not take into account the miniaturization of receiving front-end, high integration, low cost, the requirements such as ultra broadband simultaneously. On the basis not changing existing radar operation mode, the present invention can improve the design of existing front terminal circuit, it is to increase the reliability of radar system entirety.
The example of the present invention devises the protection switch circuit of Ka wave band, but it is evident that the front end receiver of the more application of more multiband can also be realized by the device or combination changing different functional circuit. In addition, in receiving front-end protection switch circuit, the design of each functional circuit all compare flexibly, and functional circuit can be that multiple combination of devices may also be single functional device, and the parameter changing their periphery circuit can the index of regulation system easily. Those skilled in the art can carry out various supplement, improvement and replacing according to different design requirementss and design variable not deviateing in the scope that the claims in the present invention define, and therefore, the present invention is widely.
The present invention, under the prerequisite meeting radar front end protection on off system normal operation, solves receiving front-end between the take over period very well and can not carry out large-signal in time judging and turn-off protection switch, thus cause whole receiving system to be subject to the problems such as impact.
Claims (6)
1. a radar receiving front-end adaptive guard method of controlling switch; it is characterized in that: receiving front-end is when being in reception state; in real time Received signal strength and detection threshold are compared: if Received signal strength is higher than detection threshold, turn off receiving front-end protection switch, if Received signal strength is lower than detection threshold, continue to keep protection switch conducting state.
2. one kind realizes radar receiving front-end adaptive guard on-off control circuit according to claim 1, it is characterised in that comprise coupling mechanism, wave-detector, voltage comparator and logical operation device; The Received signal strength being coupled out is sent into wave-detector by coupling mechanism; the Received signal strength being coupled out is carried out level detection outputs level signals by wave-detector; level signal and detection threshold are compared computing output switch level signal by voltage comparator, and the switch controlling signal of switch level Signals & Systems is carried out computing and outputs a control signal to protection switch by logical operation device.
3. a kind of radar receiving front-end adaptive guard on-off control circuit according to claim 2, it is characterised in that described coupling mechanism is the coupling mechanism of waveguide or planar circuit.
4. a kind of radar receiving front-end adaptive guard on-off control circuit according to claim 2, it is characterised in that described wave-detector is WJ0001.
5. a kind of radar receiving front-end adaptive guard on-off control circuit according to claim 2, it is characterised in that described voltage comparator is MAX961ESA.
6. a kind of radar receiving front-end adaptive guard on-off control circuit according to claim 2, it is characterised in that described logical operation device is SN74ALS21.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510991961.8A CN105629205A (en) | 2015-12-25 | 2015-12-25 | Radar receiving front-end self-adaptive protection switch control method and circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510991961.8A CN105629205A (en) | 2015-12-25 | 2015-12-25 | Radar receiving front-end self-adaptive protection switch control method and circuit |
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| CN105629205A true CN105629205A (en) | 2016-06-01 |
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| CN201510991961.8A Pending CN105629205A (en) | 2015-12-25 | 2015-12-25 | Radar receiving front-end self-adaptive protection switch control method and circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106255251A (en) * | 2016-08-31 | 2016-12-21 | 广东美的厨房电器制造有限公司 | Microwave testing circuit and comprise the microwave oven of this microwave testing circuit |
| CN107219509A (en) * | 2017-05-22 | 2017-09-29 | 西安电子工程研究所 | A kind of method for realizing radar system transmission channel on-line checking |
| CN107394420A (en) * | 2017-06-16 | 2017-11-24 | 深圳市共进电子股份有限公司 | Active single-band antenna system |
| CN108107412A (en) * | 2017-12-11 | 2018-06-01 | 南京长峰航天电子科技有限公司 | A kind of anti-saturation for the active boosters of RCS protects control device and method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106255251A (en) * | 2016-08-31 | 2016-12-21 | 广东美的厨房电器制造有限公司 | Microwave testing circuit and comprise the microwave oven of this microwave testing circuit |
| CN106255251B (en) * | 2016-08-31 | 2022-11-18 | 广东美的厨房电器制造有限公司 | Microwave detection circuit and microwave oven comprising same |
| CN107219509A (en) * | 2017-05-22 | 2017-09-29 | 西安电子工程研究所 | A kind of method for realizing radar system transmission channel on-line checking |
| CN107394420A (en) * | 2017-06-16 | 2017-11-24 | 深圳市共进电子股份有限公司 | Active single-band antenna system |
| CN108107412A (en) * | 2017-12-11 | 2018-06-01 | 南京长峰航天电子科技有限公司 | A kind of anti-saturation for the active boosters of RCS protects control device and method |
| CN108107412B (en) * | 2017-12-11 | 2021-12-14 | 南京长峰航天电子科技有限公司 | Anti-saturation protection control device and method for RCS active booster |
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