CN101452074B - Strong clutter self-adapting cancellation apparatus for analog-digital combined treatment - Google Patents
Strong clutter self-adapting cancellation apparatus for analog-digital combined treatment Download PDFInfo
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- CN101452074B CN101452074B CN2007101910589A CN200710191058A CN101452074B CN 101452074 B CN101452074 B CN 101452074B CN 2007101910589 A CN2007101910589 A CN 2007101910589A CN 200710191058 A CN200710191058 A CN 200710191058A CN 101452074 B CN101452074 B CN 101452074B
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Abstract
The present invention discloses a strong clutter self-adapting compensating device of analog digital combined procession. In the device according to the invention, the video echo signal of radar is divided into two paths through the device. One path is an original video echo signal. The other path obtains the real time clutter sample signal through high-speed analog/digital and digital/analog transformation. The clutter sample signal with controllable gain and the original video echo wave are counteracted for obtaining the signal output which restrains the clutter. The gain of clutter sample signal is automatically adjusted according to the magnitude of direct-current component of output signal, and the self-adaptation control is realized. The strong clutter self-adapting compensating device of the invention can restrain the interference of strong clutter with self-adapting in real time. The sensitivity of system is increased and the detecting capability is increased. The strong clutter self-adapting compensating device according to the invention has the advantages of simplicity, high reliability and easy realization.
Description
Technical field
The invention belongs to the technology that radar jamming suppresses, be specifically related to offset the field based on the clutter self-adapting in the civilian life detection radar system of continuous wave system, particularly a kind of strong clutter self-adapting of analog digital Combined Treatment offsets device.
Background technology
Civilian life detection radar is in personnel static or the fine motion state after mainly surveying body of wall, ruins or barrier.This is a kind of novel detecting devices, and it is mainly used in following occasion: when hostage and kidnapper are co-located in the room, need know suspect and the hostage position in the room, and they are made a distinction, be convenient to implement the hostage and rescue; Hidden in buildings as the sniper, when the police will storm buildings, need to determine sniper's position, in order to avoid casualties; When earthquake disaster took place, personnel were buried in below the ruins, at this moment needed to search out as early as possible the personnel that still live below the ruins that are embedded in; When being used for military surveillance, wish to know the deployment scenarios of enemy personnel under the blindage of the place ahead.Therefore, the life detection radar can play a significant role in fields such as anti-terrorism, geologic hazard personnel rescues.In civilian life detection radar system based on the continuous wave system, radar usually is subjected to the influence of clutters such as strong near-earth thing such as body of wall, barrier, ruins, and the personnel of target as remaining static that survey, mainly by surveying it owing to the health fine motion signal of breathing and heartbeat causes.People's breath signal frequency is generally at 0.1-0.5Hz, the heartbeat signal frequency is at 0.5-3Hz, and caused fine motion signal frequency and zero-frequency are very near, and personnel are often very near apart from barrier, therefore target echo signal is difficult to distinguish with the thing echo is all very approaching on time domain and frequency domain doughtily.On signal amplitude, target echo a little less than than near-earth thing echo many.It is very difficult will detecting target echo in this case, therefore must adopt an effective measure clutter is removed, and so just can detect faint signal, and promptly the clutter cancellation techniques is a gordian technique of life detection radar.
Number of patent application is 02830076.9, denomination of invention is the Chinese patent of " elimination of self-adaptation ground clutter ", is a kind of airborne radar ground clutter suppression equipment, comprises at least two antennas and the clutter rejection apparatus that is used for suppressing ground clutter.But this patent is at pulsed radar, for continuous wave radar and inapplicable.
Number of patent application is 200410094852.8, denomination of invention is the Chinese patent of " a kind of radar clutter of integrated universal is gathered analog simulator and analog simulation method ", comprise industrial control computer, capture card, analog simulation card, capture card is gathered the noise signal of radar to industrial control computer, this invention independently clutter harvester, clutter simulation device and clutter simulator constitutes a unified integral body, have the advantages that to carry out analogue simulation with the true clutter data of gathering, but this invention can not be finished real-time clutter and offsets processing capacity.
In various cancellation techniques, it is the most direct, the most effective that microwave offsets, but microwave offsets complexity, instability, easily temperature influence.From patent, the documents and materials of consulting, the clutter cancellation techniques is primarily aimed between the detection of a target and the background to be had than big-difference on the movement velocity or on the distance, be the discerptible situation of time domain or frequency domain, and on time domain and frequency domain, all be difficult to situation about distinguishing and inapplicable for signal and clutter.
Summary of the invention
The object of the present invention is to provide a kind of strong clutter self-adapting that can real-time adaptive ground suppresses the analog digital Combined Treatment of strong noise jamming to offset device
The technical solution that realizes the object of the invention is: a kind of strong clutter self-adapting of analog digital Combined Treatment offsets device, comprise the 3dB power splitter, first high speed mould/number sampling thief, the high speed D/A, the first controllable gain filter amplifier, fixed gain amplifier, analog adder, the second controllable gain filter amplifier, second high speed mould/number sampling thief and clutter offset to be analyzed and controller, the video echo signal of continuous wave radar output is divided into two passages by the 3dB power splitter, one the tunnel is signalling channel, through the positive input terminal of fixed gain amplifier to analog adder; Another road is the clutter passage, become digital signal through first high speed mould/number sampling thief, this digital signal reverts to simulating signal again through the high speed D/A and is input to the first controllable gain filter amplifier, carries out filtering, amplifies and obtain the negative input end that noise signal is delivered to analog adder; Two paths of signals subtracts each other in analog adder, offsets the noise signal in the echo; The input end of the second controllable gain filter amplifier is received in the output of analog adder, offset of the filtering of the echoed signal of clutter through this second controllable gain filter amplifier, send into second high speed mould/number sampling thief after the amplification and carry out high-speed sampling, after the quantification, export as the digital video echo, signal after will quantizing is simultaneously delivered to clutter and is offseted analysis and controller, clutter offsets analysis and controller is added up the signal after quantizing, analyze DC component, relatively clutter offsets effect, output signal is controlled the gain of the first controllable gain filter amplifier thus, and adjusts the gain of the second controlled filter amplifier according to duty.
The present invention compared with prior art, its remarkable advantage: (1) is widely used, the strong clutter that not only can be used in the civilian life detection radar system offsets, can also be used to offset with detectable signal in the strong clutter of all approaching other of time domain, frequency domain system.(2) can reduce the interference of strong clutter in real time, adaptively, improve the sensitivity of system, strengthen the radar detection ability.(3) the invention circuit is simple, reliability is high, be easy to realization.(4) be used for life detection radar, can alleviate the influence of strong clutter such as body of wall, barrier or ruins greatly, improve the sensitivity of system, strengthen the detectivity of radar based on the continuous wave system.
Below in conjunction with accompanying drawing the present invention is described in further detail.
Description of drawings
Fig. 1 is the composition frame chart that the strong clutter self-adapting of analog digital Combined Treatment of the present invention offsets device.
Fig. 2 is that clutter of the present invention offsets the workflow diagram of analyzing with controller.
Among the figure, A: clutter offsets to be analyzed and controller gain mails to the control signal of the first controllable gain filter amplifier.
A
i: clutter offsets to be analyzed and controller gain mails to the i gain per stage control signal of the first controllable gain filter amplifier, and the i value is 1 to N, and N is the gain progression of the first controllable gain filter amplifier.
B: clutter offsets to be analyzed and controller gain mails to the control signal of the second controllable gain filter amplifier, is divided into B
0And B
1Two-stage, B
0Be low gain, B
1Be high-gain.
C: the digital video echoed signal that has offseted clutter of second high speed mould/number sampling thief collection.
C
i: the digital video echoed signal under the i gain per stage of the first controllable gain filter amplifier, i value are 1 to N, and N is the gain progression of the first controllable gain filter amplifier.
Z
i: the digital video echoed signal C under the i gain per stage of the first controllable gain filter amplifier
iDC component.The i value is 1 to N, and N is the gain progression of the first controllable gain filter amplifier.
Embodiment
In conjunction with Fig. 1, the strong clutter self-adapting of analog digital Combined Treatment of the present invention offsets device, comprise that 3dB power splitter, first high speed mould/number sampling thief, high speed D/A, the first controllable gain filter amplifier, fixed gain amplifier, analog adder, the second controllable gain filter amplifier, second high speed mould/number sampling thief and clutter offset analysis and controller, the video echo signal of continuous wave radar output is divided into two passages by the 3dB power splitter, one the tunnel is signalling channel, through the positive input terminal of fixed gain amplifier to analog adder; Another road is the clutter passage, become digital signal through first high speed mould/number sampling thief, this digital signal reverts to simulating signal again through the high speed D/A and is input to the first controllable gain filter amplifier, carries out filtering, amplifies and obtain the negative input end that noise signal is delivered to analog adder; Two paths of signals subtracts each other in analog adder, offsets the noise signal in the echo; The input end of the second controllable gain filter amplifier is received in the output of analog adder, offset of the filtering of the echoed signal of clutter through this second controllable gain filter amplifier, send into second high speed mould/number sampling thief after the amplification and carry out high-speed sampling, after the quantification, export as the digital video echo, signal after will quantizing is simultaneously delivered to clutter and is offseted analysis and controller, clutter offsets analysis and controller is added up the signal after quantizing, analyze DC component, relatively clutter offsets effect, output signal is controlled the gain of the first controllable gain filter amplifier thus, and adjusts the gain of the second controlled filter amplifier according to duty.
Above-mentioned 3dB power splitter is divided into two-way with radar video echo signal constant power ground, one the tunnel is signalling channel, another road is a clutter sample extraction passage, should select to insert that loss is little, output two-way amplitude, power splitter that phase equalization is good, when connecting, should note the impedance matching between each parts, for simplicity, all adopt the load of 50 Ω.
First high speed mould/number sampling thief will carry out the sampling of two-forty, low quantified precision from the signal of 3dB power splitter output, and sample rate is generally more than 4 times or 4 times of video echo signal bandwidth.When realizing, be preferably lower than but, can obtain the large-signal in the echo so as much as possible, i.e. noise signal near the full scale of first high speed mould/number sampling thief through the radar video echo signal amplitude of 3dB power splitter output.The quantified precision of first high speed mould/number sampling thief is lower, and the 6-8 position gets final product.
The high speed D/A reverts to simulating signal again with the quantification digital signal of first high speed mould/number sampling thief output, and the speed of D/A is consistent with the speed of mould/number sampling thief in force, and the conversion figure place is also consistent.By the harmony work of first high speed mould/number sampling thief and high speed D/A, tentatively obtain the clutter sample signal in the echo.
The first controllable gain filter amplifier carries out filtering and amplification to the output signal of the first high speed D/A.Its median filter is wideband low pass filtering, and its bandwidth can filtering high speed mould/number and the additional interference that causes of D/A switch, and speed is very fast.Amplifier is a gain controlled amplifier, the a-signal that its gain is offseted by clutter to analyze and controller sends is controlled, has N gain per stage control, it is fixed that concrete gain margin should come in the amplitude difference scope at analog adder place according to two channel signals, gain margin should be greater than two signal amplitude difference scopes, and have certain surplus and get final product.Determine to determine gain progression N again behind the gain margin.N is big more, and gain-adjusted is thin more, and it is good more that clutter offsets effect, but the adjusting time is long and complexity increases.Generally getting N=8 gets final product.
Fixed gain amplifier carries out solid gain to the video echo signal of coming from the 3dB power splitter and amplifies surely, general gain is lower, its major function is the time delay that increases signalling channel, so as when analog adder to carry out subtraction two channel signal phase place basically identicals.When implementing, can measure the time delay that offsets passage earlier, adjust the progression of fixed gain amplifier then.
Analog adder is mainly to the additive operation that carries out of the output of signalling channel and the output of clutter passage, thereby offset clutter, obtains the signal output of clutter reduction.Totalizer can have certain gain amplifier, as 10 times.
The second controllable gain filter amplifier is to the further filtering of the output signal of analog adder, amplification, its gain can clutter offset analyze and the B signal controlling of controller output under adjust, be divided into low gain and high-gain two-stage, corresponding control signal is B
0And B
1Select fixedly low gain when originally offseting when device gains adjustment to the first controllable gain filter amplifier, as 1, corresponding control signal is B
0When gain adjustment was finished, analog adder was output as the signal of having removed big clutter, at this moment selects high-gain, and as 100, corresponding control signal is B
1, concrete gain is determined according to the requirement of second high speed mould/number sampling thief.
Second high speed mould/number sampling thief carries out high speed mould/transformation of variables to the output of the second controllable gain filter amplifier, and the signal that has suppressed clutter is become digital signal, is convenient to receiver further part digitized processing echoed signal.The sample rate of second high speed mould/number sampling thief can be lower than the sample rate of first high speed mould/number sampling thief, and 2.5 times of video bandwidths get final product, but its quantified precision wants high, 14-16, can obtain signal characteristic better like this.The input signal of wishing second high speed mould/number sampling thief when implementing equally is lower than but near the full scale of sampling thief, so should determine the high-gain numerical value of the second controllable gain filter amplifier according to the actual sampling thief situation of selecting for use.
Clutter offsets to be analyzed and the signal of controller after to second high speed mould/number sampling thief quantification carries out statistical average, obtain DC component, according to the enlargement factor of the DC component size control first controllable gain filter amplifier, adjust the high-gain and the low gain state of the second controlled filter amplifier simultaneously according to duty.Clutter offsets the workflow diagram of analysis and controller referring to Fig. 2, and its course of work is as follows:
1. after offseting device and beginning to power on, send control signal B to the second controllable gain filter amplifier
0, require the second controllable gain filter amplifier to transfer to low gain, get i=1;
2. send control signal A to the first controllable gain filter amplifier
i, require the first controllable gain filter amplifier that gain is transferred to the i level;
3. the digital video echoed signal C after obtaining and offset from second high speed mould/number sampling thief
i, to C
iIt is average to do the cycle, obtains DC quantity Z
iAnd storage;
4. i increases progressively 1, repeats the 2. 3. step, adjusts the gain of the first controllable gain filter amplifier successively, obtains and offsets back digital echo C
iThe DC quantity Z of signal
i, all adjust end until the N gain per stage;
5. from Z
1-Z
NThe middle Z that seeks minimum
i, corresponding i is designated as n;
6. send A to the first controllable gain filter amplifier
nSignal, what require the first controllable gain filter amplifier transfers to gain the n level;
7. send B to the second controllable gain filter amplifier
1Signal requires the second controllable gain filter amplifier to transfer to high-gain;
8. inquire about continuous-wave radar system and have or not clutter to offset the adjustment instruction,, then forward step to 1. if having;
9. adjust instruction if no system clutter offsets, then continue clutter that inquiry sets in advance and offset the adjustment time and whether arrive, arrive as if the time, then forward step to 1.;
10. if the time does not arrive, then go to step 8..
In the specific implementation, can adopt field programmable logic array (FPLA) FPGA or high speed digital signal processor DSP to realize.
Claims (8)
1. the strong clutter self-adapting of an analog digital Combined Treatment offsets device, it is characterized in that: comprise that 3dB power splitter, first high speed mould/number sampling thief, high speed D/A, the first controllable gain filter amplifier, fixed gain amplifier, analog adder, the second controllable gain filter amplifier, second high speed mould/number sampling thief and clutter offset analysis and controller, the video echo signal of continuous wave radar output is divided into two passages by the 3dB power splitter, one the tunnel is signalling channel, through the positive input terminal of fixed gain amplifier to analog adder; Another road is the clutter passage, become digital signal through first high speed mould/number sampling thief, this digital signal reverts to simulating signal again through the high speed D/A and is input to the first controllable gain filter amplifier, carries out filtering, amplifies and obtain the negative input end that noise signal is delivered to analog adder; Two paths of signals subtracts each other in analog adder, offsets the noise signal in the echo; The input end of the second controllable gain filter amplifier is received in the output of analog adder, offset of the filtering of the echoed signal of clutter through this second controllable gain filter amplifier, send into second high speed mould/number sampling thief after the amplification and carry out high-speed sampling, after the quantification, export as the digital video echo, signal after will quantizing is simultaneously delivered to clutter and is offseted analysis and controller, clutter offsets analysis and controller is added up the signal after quantizing, analyze DC component, relatively clutter offsets effect, output signal is controlled the gain of the first controllable gain filter amplifier thus, and adjusts the gain of the second controlled filter amplifier according to duty.
2. the strong clutter self-adapting of analog digital Combined Treatment according to claim 1 offsets device, it is characterized in that: first high speed mould/number sampling thief sampling rate is more than 4 times or 4 times of video echo signal bandwidth; The amplitude of video echo signal is near the full scale of first high speed mould/number sampling thief; 6～8 of the quantified precisions of this first high speed mould/number sampling thief.
3. the strong clutter self-adapting of analog digital Combined Treatment according to claim 1 offsets device, it is characterized in that: the slewing rate of high speed D/A and figure place are consistent with the sample rate and the figure place of first high speed mould/number sampling thief.
4. the strong clutter self-adapting of analog digital Combined Treatment according to claim 1 offsets device, it is characterized in that: the signal controlling that first its gain of controllable gain filter amplifier is offseted by clutter to analyze and controller sends has multistage gain control.
5. the strong clutter self-adapting of analog digital Combined Treatment according to claim 1 offsets device, it is characterized in that: fixed gain amplifier carries out fixed gain to the video echo signal from the output of 3dB power splitter and amplifies, increase the time delay of signalling channel, so as when analog adder to carry out subtraction two channel signal time delay basically identicals.
6. the strong clutter self-adapting of analog digital Combined Treatment according to claim 1 offsets device, it is characterized in that: the gain of the second controllable gain filter amplifier clutter offset analyze and the signal controlling of controller output under adjust, two gain per stages are arranged, select fixedly low gain when adjusting when the first controllable gain filter amplifier is gained; Select high-gain when finishing when adjusting.
7. the strong clutter self-adapting of analog digital Combined Treatment according to claim 1 offsets device, it is characterized in that: the sample rate of second high speed mould/number sampling thief can be lower than the sample rate of first high speed mould/number sampling thief, 2.5 doubly video bandwidth gets final product, its quantified precision is 14-16.
8. the strong clutter self-adapting of analog digital Combined Treatment according to claim 1 offsets device, it is characterized in that: the course of work that clutter offsets analysis and controller is as follows:
1. after offseting device and beginning to power on, send control signal B to the second controllable gain filter amplifier
0, require the second controllable gain filter amplifier to transfer to low gain, get i=1;
2. send control signal A to the first controllable gain filter amplifier
i, require the first controllable gain filter amplifier that gain is transferred to the i level;
3. the digital video echoed signal C after obtaining and offset from second high speed mould/number sampling thief
i, to C
iIt is average to do the cycle, obtains DC quantity Z
iAnd storage;
4. i increases progressively 1, repeats the 2. 3. step, adjusts the gain of the first controllable gain filter amplifier successively, obtains and offsets back digital echo C
iThe DC quantity Z of signal
i, all adjust end until the N gain per stage;
5. from Z
1-Z
NThe middle Z that seeks minimum
i, corresponding i is designated as n;
6. send A to the first controllable gain filter amplifier
nSignal, what require the first controllable gain filter amplifier transfers to gain the n level;
7. send B to the second controllable gain filter amplifier
1Signal requires the second controllable gain filter amplifier to transfer to high-gain;
8. inquire about continuous-wave radar system and have or not clutter to offset the adjustment instruction,, then forward step to 1. if having;
9. adjust instruction if no system clutter offsets, then continue clutter that inquiry sets in advance and offset the adjustment time and whether arrive, arrive as if the time, then forward step to 1.;
10. if the time does not arrive, then go to step 8..
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| CN101640475B (en) * | 2009-09-04 | 2011-07-27 | 西安交通大学 | Anti-interference current sample circuit based on cancellation method |
| CN102353942B (en) * | 2011-07-11 | 2013-10-30 | 哈尔滨工程大学 | Adaptive cancellation method for interference of underwater reverberation |
| CN103856220B (en) * | 2014-01-26 | 2016-08-17 | 西安天伟电子系统工程有限公司 | A kind of passive radar two-channel receiver radio frequency offsets method |
| CN106249211B (en) * | 2016-08-05 | 2018-10-23 | 中国电子科技集团公司第二十八研究所 | A kind of sea clutter and sexual intercourse Clutter suppression algorithm |
| CN106249241B (en) * | 2016-08-05 | 2018-08-24 | 中国电子科技集团公司第二十八研究所 | A kind of self-adapting clutter power statistic algorithm |
| CN106443658B (en) * | 2016-09-09 | 2018-11-09 | 电子科技大学 | A kind of low coverage radar sensor and its distance measuring method |
| CN109581348B (en) * | 2018-12-14 | 2022-08-05 | 湖南华诺星空电子技术有限公司 | Method and system for adaptive detection and elimination of modulation leakage of continuous wave radar |
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| CN2620868Y (en) * | 2003-05-30 | 2004-06-16 | 曹型勇 | Optical life detector |
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