CN103454620B - Tracking-type active radar calibrator based on transmitted signal reestablishing system - Google Patents
Tracking-type active radar calibrator based on transmitted signal reestablishing system Download PDFInfo
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Abstract
The invention relates to a tracking-type active radar calibrator based on a transmitted signal reestablishing system. The tracking-type active radar calibrator comprises a servo unit (1), a radio frequency receiver (2) and a radio frequency transmitter (5). The tracking-type active radar calibrator further comprises a tracking device (3), a signal reestablishing device (4) and a frequency synthesizer (6), the tracker (3) is respectively connected with the radio frequency receiver (2), the frequency synthesizer (6) and the signal reestablishing device (4), and the signal reestablishing device (4) is further connected with the frequency synthesizer (6) and the radio frequency emitter (5). The tracking-type active radar calibrator can quickly capture tracking radar signals and reestablish radio frequency signals so as to send the signals to an on-orbit satellite radar, and realize the functions that at any position within the coverage range of the satellite radar signals, the radar signals can be captured and tracked quickly, signal emission time can be accurately set according to received signal intervals, and the radio frequency signals are reestablished to be sent to the radar.
Description
Technical field
The present invention relates to microwave remote sensing technique field, particularly relate to a kind of following-up type source scaler of rebuilding system based on forward signal.
Background technology
Satellite radar is period in orbit, and due to component aging, clock drift, the factors such as antenna attitude fluctuation, can affect system delay and the gain of radar, thus cause the error of radar earth observation.
For ensure radar in orbit period observation data stability, accuracy and reliability, need to carry out In-flight calibration and validity check to radar, ensures the continuity of radar observation task and the consistance of data standard.
Source scaler is a kind of radar ground In-flight calibration equipment.For the point target echoed signal that radar provides standard known, the Time delay measurement equal error of its own system revised by radar by receiving this standard signal, thus realizes radar absolute calibration in-orbit.
Traditional direct forward type source scaler can not tracking radar signal, only realize the reception to radar signal, amplify and directly forward, the analyzing and processing of baseband conversion and frequency spectrum can not be carried out to the radar signal received, for satellite radar, the type source scaler is only as the bend pipe of a transparent forwarding.Because it does not possess catching and following function radar signal, in order to ensure that the signal that source scaler forwards can enter in radar receive window, need the exact height calculating the laying place that this source scaler requires before test is carried out according to parameters such as the satellite radar flying height of prediction and signal transmission intervals, during Orbital detection, the type source scaler must be fixedly mounted on this specific elevation place in radar beam overlay area, to guarantee that the signal that scaler forwards can enter radar receive window.
In addition, because this direct forward type source scaler only does transparent forwarding to the radar signal received, do not have the Reconstruction of The Function of forward signal, make forward signal only have fixing amount of delay, namely the start trigger moment of forward signal is fixed.In fact, in satellite radar in orbit process, impact due to multiple space factor is difficult to accomplish Accurate Prediction to its flying height, cannot ensure that for the source scaler of constant time lag amount can only be provided its forward signal accurately enters radar receive window at trigger instants, so the success ratio of In-flight calibration test is lower.
At present, satellite radar In-flight calibration both domestic and external all uses direct forward type source scaler, equipment is fixedly mounted on certain some position in radar signal overlay area, in radar recursion period, the only opportunity of once In-flight calibration, in order to obtain the test figure of abundant number of times, need the test period grown very much.
Summary of the invention
The object of the invention is to, for solving the specific restriction of above-mentioned direct forward type source scaler installation site, and the technical matters that the success ratio that a fixing amount of delay can only be provided to cause In-flight calibration to be tested is lower, the invention provides a kind of following-up type source scaler of rebuilding system based on forward signal.This following-up type source scaler can fast Acquisition tracking radar signal rebuild emission of radio frequency signals to satellite in orbit radar, realize the arbitrary place place in the radar signal overlay area of satellite, can both fast Acquisition tracking radar signal, according to the sigtnal interval received accurate signalization x time, rebuild emission of radio frequency signals to the function of radar.
For achieving the above object, the invention provides a kind of following-up type source scaler of rebuilding system based on forward signal.This following-up type source scaler comprises: unit is watched in sky, radio-frequency transmitter, radio frequency sending set, it is characterized in that, this following-up type source scaler also comprises tracker, signal re-creator, frequency synthesizer, described sky is watched unit and is connected with radio-frequency transmitter and radio frequency sending set respectively;
Described tracker is connected with radio-frequency transmitter, frequency synthesizer and signal re-creator respectively, this tracker generates result of spectrum analysis and exports frequency synthesizer and signal re-creator respectively to after being used for that the radiofrequency signal that radio-frequency transmitter exports is carried out fast Fourier transform analysis process;
Described signal re-creator is also connected with frequency synthesizer and radio frequency sending set, and the result of spectrum analysis that this signal re-creator is used for tracker exports carries out analyzing and processing, generates base-band analog signal and exports radio frequency sending set to after being modulated to intermediate frequency;
Described frequency synthesizer is respectively radio-frequency transmitter, radio frequency sending set, tracker, signal re-creator provide local oscillation signal, the result of spectrum analysis that each local oscillation signal is all exported by tracker carries out adjusting and keeps phase place consistent, and it is for controlling the start trigger moment of radio-frequency transmitter, radio frequency sending set, tracker, signal re-creator.
As the further improvement of technique scheme, described tracker comprises: radio frequency detector device, phase-sensitive detector (PSD), AD converter and tracking filter;
The radiofrequency signal that described radio frequency detector device received RF receiver exports carries out detection, obtains radio frequency envelope signal, this radio frequency envelope signal as the original time base of tracker, for calculating the start trigger moment of described each local oscillation signal;
The intermediate-freuqncy signal that described phase-sensitive detector (PSD) is used for radio-frequency transmitter exports carries out phase sensitive detection, generates two-way base band quadrature signal and inputs to AD converter;
Described AD converter is used for the described two-way base band quadrature signal received to carry out AD conversion, generates digital signal;
The digital signal that tracking filter is exported by fast Fourier transform analysis process AD converter, and in conjunction with radio frequency detector device export radio frequency envelope signal after, generate and output spectrum analysis result.
As the further improvement of technique scheme, described signal re-creator comprises: digital quantity generator, D/A converter and quadrature modulator;
The result of spectrum analysis that described digital quantity generator exports for receiving tracker, does spectrum analysis and time delay numerical evaluation by this result, generate baseband digital signal and exported to D/A converter;
The input end of D/A converter is connected with digital quantity generator, and the described baseband digital signal received is carried out DA conversion, exports the two-way base-band analog signal of generation to quadrature modulator;
Quadrature modulator is connected with D/A converter, is modulated by the described base-band analog signal received, and generates intermediate-freuqncy signal and exports radio frequency sending set to.
As the further improvement of technique scheme, described radio-frequency transmitter comprises: low noise amplification and wave filter, Full-deramp frequency mixer, the first intermediate frequency amplify and wave filter;
Described low noise amplification is watched unit with the input end of wave filter with sky and is connected, and the radiofrequency signal that unit output is watched in reception sky carries out amplification filtering, and its output terminal is connected with Full-deramp frequency mixer and radio frequency detector device respectively;
Full-deramp mixer input is connected with wave filter with low noise amplification, the radiofrequency signal after amplification filtering that reception low noise amplification and wave filter export, and by itself and local oscillation signal mixing, obtains the intermediate-freuqncy signal tiltedly;
First intermediate frequency amplification is connected with Full-deramp frequency mixer with wave filter, to going the intermediate-freuqncy signal tiltedly to do further amplification filtering, and exports the intermediate-freuqncy signal after amplification filtering to phase-sensitive detector (PSD).
As the further improvement of technique scheme, described radio frequency sending set comprises: the second intermediate frequency amplifies and wave filter, up-conversion mixer, power amplification and wave filter;
Second intermediate frequency amplification is connected with quadrature modulator with wave filter, the intermediate-freuqncy signal received is carried out amplification filtering, and export the intermediate-freuqncy signal after amplification filtering to up-conversion mixer from quadrature modulator;
Up-conversion mixer amplifies with the second intermediate frequency and is connected with wave filter, by the intermediate-freuqncy signal up-conversion of amplifying from the second intermediate frequency after the amplification filtering that receives with wave filter to radiofrequency signal, and exports this radiofrequency signal to power amplification and wave filter;
Power amplification is connected with up-conversion mixer with wave filter, the radiofrequency signal received is carried out amplification filtering and exported sky to watch unit from up-conversion mixer.
As the further improvement of technique scheme, described frequency synthesizer also provides clock signal as the change over clock of AD converter and D/A converter.
A kind of advantage of rebuilding the following-up type source scaler of system based on forward signal of the present invention is:
(1) there is the following function of radiofrequency signal, in In-flight calibration process of the test, without the need to the laying elevation of calculated in advance scaler, only scaler need be placed on any position in radar signal coverage, Orbital detection can be carried out, greatly reduce targeting device to the requirement of laying place, make implantation of device maneuverability more;
(2) in the recursion period of satellite radar, the laying of multi-point can be realized in any position in radar signal coverage, the bracketing cycle is shortened greatly, in satellite radar recursion period, can test in-orbit respectively on adjacent satellite track, improve test efficiency, enhance the ageing of the calibration results;
(3) there is the Reconstruction of The Function of forward signal, by the spectrum analysis to the radar signal received, accurately can calculate the start trigger moment of the forward signal of reconstruction, rebuild one group of radio-frequency pulse mated completely with the Transmission Time Interval of radar signal and be transmitted to satellite radar, ensure that the forward signal launched accurately enters the receive window of radar, substantially increase the success ratio of In-flight calibration test;
(4) forward signal reconstruction and radar signal following function are realized by fast fourier transform algorithm analyzing and processing, compared to the direct forward type source scaler of traditional system, this kind of forward signal rebuilds system following-up type source scaler does not increase hardware cost and complexity.
Accompanying drawing explanation
Fig. 1 is a kind of schematic block diagram rebuilding the following-up type source scaler of system based on forward signal of the present invention.
Fig. 2 is a kind of structural drawing rebuilding the following-up type source scaler of system based on forward signal in the embodiment of the present invention.
Reference numeral
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described and be achieved by following technical proposals.
As shown in Figure 1, following-up type source scaler of rebuilding system based on forward signal of the present invention, this following-up type source scaler comprises: unit is watched in sky, radio-frequency transmitter, radio frequency sending set, this following-up type source scaler also comprises tracker, signal re-creator, frequency synthesizer, described sky is watched unit and is connected with radio-frequency transmitter and radio frequency sending set respectively;
Described tracker is connected with radio-frequency transmitter, frequency synthesizer and signal re-creator respectively, this tracker generates result of spectrum analysis and exports frequency synthesizer and signal re-creator respectively to after being used for that the radiofrequency signal that radio-frequency transmitter exports is carried out fast Fourier transform analysis process;
Described signal re-creator is also connected with frequency synthesizer and radio frequency sending set, and the result of spectrum analysis that this signal re-creator is used for tracker exports carries out analyzing and processing, generates base-band analog signal and exports radio frequency sending set to after being modulated to intermediate frequency;
Described frequency synthesizer is respectively radio-frequency transmitter, radio frequency sending set, tracker, signal re-creator provide local oscillation signal, the result of spectrum analysis that each local oscillation signal is all exported by tracker carries out adjusting and keeps phase place consistent, and it is for controlling the start trigger moment of radio-frequency transmitter, radio frequency sending set, tracker, signal re-creator.
As shown in Figure 2, be a kind of structural drawing rebuilding the following-up type source scaler of system based on forward signal in the embodiment of the present invention.Wherein, the radiofrequency signal transceiver unit that unit 1 is described following-up type source scaler is watched in sky, specifically comprises: antenna, feed, circulator, servo turntable.It circulator watched in unit 1 is connected with radio-frequency transmitter 2 and radio frequency sending set 5 by radio-frequency cable; Circulator front end is connected with feed, and feed carries out the conversion of electromagnetic wave signal between space and cable; Servo turntable is for regulating antenna direction, and in radar calibration process, radar antenna main beam is aimed in servo turntable control antenna greatest irradiation direction.
Described radio-frequency transmitter 2 comprises: low noise amplification and wave filter 21, Full-deramp frequency mixer 22, first intermediate frequency amplify and wave filter 23; Described low noise amplification is watched unit 1 with the input end of wave filter 21 with sky and is connected, the radiofrequency signal that unit 1 output is watched in reception sky carries out amplification filtering, its output terminal is connected with Full-deramp frequency mixer 22 and radio frequency detector device 31 respectively, signal main road connects Full-deramp frequency mixer 22, and coupling branch road is connected with radio frequency detector device 31; Full-deramp frequency mixer 22 input end is connected with wave filter 21 with low noise amplification, the radiofrequency signal after amplification filtering that reception low noise amplification and wave filter 21 export, and by itself and radio-frequency transmitter local oscillation signal 61 mixing, obtains the intermediate-freuqncy signal tiltedly; First intermediate frequency amplification is connected with Full-deramp frequency mixer 22 with wave filter 23, to going the intermediate-freuqncy signal tiltedly to do further amplification filtering, and exports the intermediate-freuqncy signal after amplification filtering to phase-sensitive detector (PSD) 34.Described radio-frequency transmitter local oscillation signal 61 comes from frequency synthesizer 6, and this radio-frequency transmitter local oscillation signal 61 is for controlling the start trigger moment of radio-frequency transmitter 2.
Described tracker 3 comprises: radio frequency detector device 31, phase-sensitive detector (PSD) 34, AD converter 33 and tracking filter 32; The radiofrequency signal that described radio frequency detector device 31 received RF receiver 2 exports carries out detection, obtains radio frequency envelope signal, this radio frequency envelope signal as the original time base of tracker 3, for calculating the start trigger moment of described each local oscillation signal; Described phase-sensitive detector (PSD) 34 carries out phase sensitive detection for the intermediate-freuqncy signal exported by radio-frequency transmitter 2, generates two-way base band quadrature signal and inputs to AD converter 33; Described AD converter 33, for the described two-way base band quadrature signal received is carried out AD conversion, generates digital signal; The digital signal that tracking filter 32 is exported by fast Fourier transform analysis process AD converter 33, and in conjunction with radio frequency detector device 31 export radio frequency envelope signal after, generate and output spectrum analysis result.Tracker 3 exports above-mentioned result of spectrum analysis to frequency synthesizer 6, go to adjust each local oscillation signal, the start trigger moment and the phase place that namely adjust radio-frequency transmitter local oscillation signal 61, radio frequency sending set local oscillation signal 62, tracker local oscillation signal 63 and signal re-creator local oscillation signal 64 keep synchronous; Then obtain next result of spectrum analysis, so circulate, until result of spectrum analysis is stabilized in the scope of setting, represent that this following-up type source scaler enters the tenacious tracking stage.After entering the tenacious tracking stage, tracking filter 32 exports result of spectrum analysis to signal re-creator 4.Described tracker local oscillation signal 63 comes from frequency synthesizer 6, and this tracker local oscillation signal 63 is for controlling the start trigger moment of tracker 3.
Described signal re-creator 4 comprises: digital quantity generator 41, D/A converter 42 and quadrature modulator 43; The result of spectrum analysis that described digital quantity generator 41 exports for receiving tracker 3, does spectrum analysis and time delay numerical evaluation by this result, generate baseband digital signal and exported to D/A converter 42; The input end of D/A converter 42 is connected with digital quantity generator 41, and the described baseband digital signal received is carried out DA conversion, exports the two-way base-band analog signal of generation to quadrature modulator 43; Quadrature modulator 43 is connected with D/A converter 42, is modulated by the described base-band analog signal received, and generates intermediate-freuqncy signal and exports radio frequency sending set 5 to.Described signal re-creator local oscillation signal 64 comes from frequency synthesizer 6, and this signal re-creator local oscillation signal 64 is for the start trigger moment of control signal reconstructor 4.
Described radio frequency sending set 5 comprises: the second intermediate frequency amplifies and wave filter 51, up-conversion mixer 52, power amplification and wave filter 53; Second intermediate frequency amplification is connected with quadrature modulator 43 with wave filter 51, the intermediate-freuqncy signal received is carried out amplification filtering, and export the intermediate-freuqncy signal after amplification filtering to up-conversion mixer 52 from quadrature modulator 43;
Up-conversion mixer 52 amplifies with the second intermediate frequency and is connected with wave filter 51, by the intermediate-freuqncy signal up-conversion of amplifying from the second intermediate frequency after the amplification filtering that receives with wave filter 51 to radiofrequency signal, and exports this radiofrequency signal to power amplification and wave filter 53; Power amplification is connected with up-conversion mixer 52 with wave filter 53, the radiofrequency signal received is carried out amplification filtering and exports sky to watching unit 1 from up-conversion mixer 52.Described radio frequency sending set local oscillation signal 62 comes from frequency synthesizer 6, and this radio frequency sending set local oscillation signal 62 is for controlling the start trigger moment of radio frequency sending set 5.
In the reconstruction, emission process of the tracking of above-mentioned radar signal and forward signal, described frequency synthesizer 6 is not only radio-frequency transmitter 2, radio frequency sending set 5, tracker 3 and signal re-creator 4 and provides local oscillation signal, i.e. radio-frequency transmitter local oscillation signal 61, radio frequency sending set local oscillation signal 62, tracker local oscillation signal 63 and signal re-creator local oscillation signal 64; This frequency synthesizer 6 also can provide clock signal as the change over clock of AD converter (33) and D/A converter (42).Each local oscillation signal that frequency synthesizer 6 exports and clock signal have high stability, the characteristic of low spurious.
A kind of following-up type source scaler based on forward signal reconstruction system of the present invention obtains many successes application in satellite radar Orbital detection.Actual test result shows: this forward signal rebuilds the following-up type source scaler of system can tenacious tracking radar signal, and the radiofrequency signal of reconstruction accurately can be emitted to radar receive window.The precision of the calibration results and degree of stability are all better than current international state-of-the-art.
Finally it should be noted that above embodiment only in order to technical scheme of the present invention to be described and unrestricted.Although with reference to embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, modify to technical scheme of the present invention or equivalent replacement, do not depart from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (4)
1. rebuild the following-up type source scaler of system based on forward signal for one kind, comprise: unit (1) is watched in sky, radio-frequency transmitter (2), radio frequency sending set (5), it is characterized in that, this following-up type source scaler also comprises tracker (3), signal re-creator (4), frequency synthesizer (6), described sky is watched unit (1) and is connected with radio-frequency transmitter (2) and radio frequency sending set (5) respectively;
Described tracker (3) is connected with radio-frequency transmitter (2), frequency synthesizer (6) and signal re-creator (4) respectively, after this tracker (3) carries out fast Fourier transform analysis process for the radiofrequency signal exported by radio-frequency transmitter (2), generate result of spectrum analysis and export frequency synthesizer (6) and signal re-creator (4) respectively to;
Described signal re-creator (4) is also connected with frequency synthesizer (6) and radio frequency sending set (5), this signal re-creator (4) carries out analyzing and processing for the result of spectrum analysis exported by tracker (3), generates base-band analog signal and exports radio frequency sending set (5) after being modulated to intermediate frequency to;
Described frequency synthesizer (6) is respectively radio-frequency transmitter (2), radio frequency sending set (5), tracker (3), signal re-creator (4) provide local oscillation signal, the result of spectrum analysis that each local oscillation signal is all exported by tracker (3) carries out adjusting and keeps phase place consistent, and it is for controlling the start trigger moment of radio-frequency transmitter (2), radio frequency sending set (5), tracker (3), signal re-creator (4);
Described tracker (3) comprising: radio frequency detector device (31), phase-sensitive detector (PSD) (34), AD converter (33) and tracking filter (32);
The radiofrequency signal that described radio frequency detector device (31) received RF receiver (2) exports carries out detection, obtain radio frequency envelope signal, this radio frequency envelope signal as the original time base of tracker (3), for calculating the start trigger moment of described each local oscillation signal;
Described phase-sensitive detector (PSD) (34) carries out phase sensitive detection for the intermediate-freuqncy signal exported by radio-frequency transmitter (2), generates two-way base band quadrature signal and inputs to AD converter (33);
Described AD converter (33), for the described two-way base band quadrature signal received is carried out AD conversion, generates digital signal;
The digital signal that tracking filter (32) is exported by fast Fourier transform analysis process AD converter (33), and after the radio frequency envelope signal exported in conjunction with radio frequency detector device (31), generate and output spectrum analysis result;
Described signal re-creator (4) comprising: digital quantity generator (41), D/A converter (42) and quadrature modulator (43);
The result of spectrum analysis that described digital quantity generator (41) exports for receiving tracker (3), this result is done spectrum analysis and time delay numerical evaluation, generate baseband digital signal and exported to D/A converter (42);
The input end of D/A converter (42) is connected with digital quantity generator (41), and the described baseband digital signal received is carried out DA conversion, exports the two-way base-band analog signal of generation to quadrature modulator (43);
Quadrature modulator (43) is connected with D/A converter (42), is modulated by the described base-band analog signal received, and generates intermediate-freuqncy signal and exports radio frequency sending set (5) to.
2. following-up type source scaler of rebuilding system based on forward signal according to claim 1, it is characterized in that, described radio-frequency transmitter (2) comprising: low noise amplification and wave filter (21), Full-deramp frequency mixer (22), the first intermediate frequency amplify and wave filter (23);
Described low noise amplification is watched unit (1) with the input end of wave filter (21) with sky and is connected, receive sky to watch the radiofrequency signal that unit (1) exports and carry out amplification filtering, its output terminal is connected with Full-deramp frequency mixer (22) and radio frequency detector device (31) respectively;
Full-deramp frequency mixer (22) input end is connected with wave filter (21) with low noise amplification, the radiofrequency signal after amplification filtering that reception low noise amplification and wave filter (21) export, by itself and local oscillation signal mixing, obtain the intermediate-freuqncy signal tiltedly;
First intermediate frequency amplification is connected with Full-deramp frequency mixer (22) with wave filter (23), to going the intermediate-freuqncy signal tiltedly to do further amplification filtering, and exports the intermediate-freuqncy signal after amplification filtering to phase-sensitive detector (PSD) (34).
3. following-up type source scaler of rebuilding system based on forward signal according to claim 1, it is characterized in that, described radio frequency sending set (5) comprising: the second intermediate frequency amplifies and wave filter (51), up-conversion mixer (52), power amplification and wave filter (53);
Second intermediate frequency amplification is connected with quadrature modulator (43) with wave filter (51), the intermediate-freuqncy signal received from quadrature modulator (43) is carried out amplification filtering, and exports the intermediate-freuqncy signal after amplification filtering to up-conversion mixer (52);
Up-conversion mixer (52) and the second intermediate frequency amplify and are connected with wave filter (51), the intermediate-freuqncy signal up-conversion after the amplification filtering received with wave filter (51) will be amplified to radiofrequency signal from the second intermediate frequency, and this radiofrequency signal be exported to power amplification and wave filter (53);
Power amplification is connected with up-conversion mixer (52) with wave filter (53), the radiofrequency signal received is carried out amplification filtering and exports sky to watching unit (1) from up-conversion mixer (52).
4. following-up type source scaler of rebuilding system based on forward signal according to claim 1, it is characterized in that, described frequency synthesizer (6) also provides clock signal as the change over clock of AD converter (33) and D/A converter (42).
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| CN103777184B (en) * | 2014-01-13 | 2016-01-20 | 中国科学院空间科学与应用研究中心 | A kind of Signal Matching method of Satellite-borne Radar Altimeter and source scaler |
| CN103792519B (en) * | 2014-01-13 | 2016-03-09 | 中国科学院空间科学与应用研究中心 | A kind of spaceborne radar clock drift bearing calibration in-orbit based on source scaler |
| CN103901412B (en) * | 2014-03-31 | 2016-11-23 | 中国科学院空间科学与应用研究中心 | A kind of calibrating method and system rebuilding following-up type source scaler for pulse |
| DE102016110344A1 (en) * | 2016-06-03 | 2017-12-07 | Infineon Technologies Ag | RF RECEIVER WITH BUILT-IN SELF-TEST FUNCTION |
| CN111562568B (en) * | 2020-04-30 | 2022-05-24 | 北京卫星信息工程研究所 | Radar transmitting end, receiving end, frequency synchronization method and transceiving networking radar |
| CN113357964B (en) * | 2021-04-21 | 2023-01-31 | 中国人民解放军海军航空大学航空作战勤务学院 | Radar simulator |
| CN117724063B (en) * | 2024-01-25 | 2024-05-14 | 南京新频点电子科技有限公司 | Mobile unmanned aerial vehicle SAR radar active scaler device |
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