CN103091664B - Real-time suppression method for through-wall radar coupling signals - Google Patents
Real-time suppression method for through-wall radar coupling signals Download PDFInfo
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Abstract
The invention provides a real-time suppression method for through-wall radar coupling signals. The technical scheme is that the method comprises the steps of conducting 8-time interpolation to echo signals; then by simply normalizing the interpolated echo signals based on a largest value of the interpolated echo signals, obtaining post-amplitude-compensation echo signals; further, calculating the mean value of all the post-amplitude-compensation echo signals before the current time, using echo signals as reference signals, conducting mutual correlation operation to the post-amplitude-compensation echo signals before the current time and post-amplitude-compensation echo signals at the current time, searching out the position of a largest value in the result of the mutual correlation operation and using the largest value as a time delay value, and conducting time delay compensation to the post-amplitude-compensation echo signals at the current time; finally, processing the post-time-delay-compensation echo signals at the current time by the adoption of the index number moving average background cancellation method to complete suppression to the coupling signals at the current time. The real-time suppression method reduces false-alarm caused by residue of the coupling signals when a through-wall radar probes objects within a close range.
Description
Technical field
The invention belongs to through-wall radar field of detecting, relate to a kind of real-time inhibition method of the coupled signal that can be used for through-wall radar detection.
Background technology
In through-wall radar, echoed signal comprises echo signal, noise signal, noise signal and coupled signal.Wherein, coupled signal is present between dual-mode antenna, and its signal amplitude is very strong and the duration is longer, tends to override the echoed signal of close-in target.Therefore, through-wall radar, in the time surveying close-in target, must suppress the interference of coupled signal.Conventionally, coupled signal is considered to stable suppressing.But in actual through-wall radar, thrashing is that inevitably its duration, this made the amplitude of coupled signal and time delay can not keep stable often in 10 ~ 150 picosecond range.If not taking into account system shake and coupled signal is suppressed, residual after inhibition is enough to cause false-alarm.Therefore, how to suppress comparatively up hill and dale coupled signal and disturb, improve SCR(Signal-to-Clutter Ratio, signal to noise ratio), the key while becoming through-wall radar detection close-in target.
In through-wall radar, common coupled signal inhibition method has three kinds: range gate method, MTI (indication of Moving Target Indication moving target) method and the background method that disappears mutually.
One, range gate method.
Range gate method often appears at the fact on closer distance unit based on coupled signal, chooses the suitable range gate that comprises coupled signal, and the echoed signal in range gate is directly removed or zero setting, realizes the inhibition to coupled signal.As document: Attiya, A.M., A.Bayram, A.Safaai-Jazi, and S.M.Riad, UWB applications for through-wall detection.IEEE Antennas and Propagation Society International Symposium, 2004.
In the time surveying close-in target, this method is worthless.In through-wall radar, the hangover duration of radar emission signal is longer, and the scope that coupled signal covers is larger, often can reach 3 meters.Range gate method, in removing coupled signal, is also removed the echoed signal of close-in target in the lump, causes through-wall radar to produce detection blind area, has limited the detection range of through-wall radar.
Two, MTI method.
Time delay and the amplitude of MTI method supposition coupled signal keep stable, coupled signal is used as to a kind of noise signal and suppresses to process.As document: Lazaro, A., D.Girbau, and R.Villarino, Analysis of vital signs monitoring using an IR-UWB radar.Progress In Electromagnetics Research-Pier, Vol.100,265-284,2010.Above-mentioned document utilization two pulse cancellers suppress coupled signal.Two pulse cancellers are simple in structure, only current time pulse echo signal need be deducted to the pulse echo signal in previous moment, do not need multiplying, and operational efficiency is high.By level di-pulse canceller, can expand to N pulse canceller.As document: Richards, M.A., Fundamentals of radar signal processing, McGraw-Hill, New York, 2005.
MTI method is owing to not considering the instability of coupled signal, for faint target echo signal, and residual still very high after coupled signal suppresses; Simultaneously, due to together with static target echo is aliasing in noise signal, MTI method can be the two filtering in the lump.
Three, the background method that disappears mutually.
The background method that disappears is mutually chosen the historical echoed signal estimated background of some, then subtracts each other with current time echoed signal, completes the inhibition of coupled signal.As document: Zetik, R., S.Crabbeb, J.Krajnakc, P.Peyerld, J.Sachsa, and R.
detection and localization of persons behind obstacles using M-sequence through-the-wall radar, Proceedings of SPIE on Conference on Sensors, and Command, Control, Communications, and Intelligence (C31) Technologies for Homeland Security and Homeland Defense V, 2006.According to the difference of background estimating method, background phase elimination can be divided into: overall average background disappears mutually, running mean background phase slake index running mean background disappears mutually.The overall situation average background method that disappears is mutually in addition average by whole historical echoed signals, estimated background; Running mean background disappears average that method chooses echoed signal in sliding window as a setting mutually; Index running mean background the has disappeared method compatibility mutually chief of first two method, give the weights that converge to gradually zero for historical echoed signal, estimated background, as document: Chen Jie, ultra-wideband radar signal is processed and formation method research, doctorate paper, Postgraduate School, Chinese Academy of Sciences (electronics research institute), 2007.
Although background disappears mutually, method has good adaptability for the target of different motion state, suppressing when coupled signal, not consider equally the instability of coupled signal, and residual still very strong after coupled signal suppresses.
Summary of the invention
Goal of the invention: the invention provides a kind of real-time effective ways that suppress coupled signal, improve SCR, reduce the residual false-alarm after through-wall radar coupled signal in the time surveying close-in target suppresses.
Technical scheme: for utilize through-wall radar carry out through walls survey time obtain n-hour echoed signal, carry out following processing:
In the time of N=1, the echoed signal in this moment is carried out to 8 times of interpolation of time domain, the maximal value of the echoed signal based on after interpolation, echoed signal after this moment interpolation of normalization, obtain the echoed signal after the Amplitude Compensation in this moment, above-mentioned normalized is that the echoed signal after interpolation is carried out to Amplitude Compensation.
In the time of N >=2, first the echoed signal of n-hour is entered to 8 times of interpolation of time domain; Secondly, based on after interpolation n-hour echoed signal maximal value, the echoed signal after normalization n-hour interpolation, obtains the echoed signal after the Amplitude Compensation of n-hour, above-mentioned normalized is that the echoed signal after interpolation is carried out to Amplitude Compensation; Then, calculate the average of the echoed signal after all Amplitude Compensations between moment 1 to moment N-1, as with reference to signal, make computing cross-correlation with the echoed signal after n-hour Amplitude Compensation, search out in computing cross-correlation result peaked position as time delay value, the echoed signal after n-hour Amplitude Compensation is carried out to delay compensation; Finally, to the echoed signal after n-hour delay compensation, adopt the index running mean background method that disappears mutually, complete the inhibition to n-hour coupled signal.
Beneficial effect: the present invention compensates by the amplitude to coupled signal and phase place, eliminate the impact of thrashing on coupled signal stability, association index running mean background disappears mutually, and then successfully solved the conventional background method that disappears mutually and suppressed residual larger problem when coupled signal, when having reduced through-wall radar and having surveyed close-in target coupled signal suppress after the residual false-alarm causing.
Accompanying drawing explanation
Fig. 1 is that coupled signal of the present invention suppresses process flow diagram;
Fig. 2 suppresses without coupled signal the experimental result of processing in the time of detection close distance human body target through walls;
Fig. 3 be index running mean background phase elimination in the time of detection close distance human body target through walls, be coupled suppress process experimental result;
Fig. 4 be the present invention in the time of detection close distance human body target through walls, be coupled suppress process experimental result;
Fig. 5 is radar parameter in the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is done to further detailed explanation.
In the present invention, through-wall radar is operated in and pastes under wall pattern, and antenna keeps transfixion, applies coupled signal inhibition method set forth in the present invention coupled signal is suppressed.
The present invention propose coupled signal suppress method carried out experimental verification by above-mentioned through-wall radar, the results show validity of the present invention.This through-wall radar parameter as shown in Figure 5.
Choose thickness and be the brick wall of 30 centimetres, in wall one side from 1.5 meters of of wall, the human body target that the height that stands still is 1.75 meters.Through-wall radar pastes wall and is placed on the other side of wall.
According to Fig. 1, the inhibition that completes coupled signal need be passed through following steps:
(a) in the time of moment N=1, the echoed signal of n-hour is carried out to 8 times of interpolation of time domain, calculate the maximal value M of n-hour interpolation back echo signal
1, by the echoed signal after n-hour interpolation divided by maximal value M
1, obtain the echoed signal after N=1 moment Amplitude Compensation;
When the moment is when N >=2, carry out following (b) to (f) step:
(b) echoed signal of n-hour is carried out to 8 times of interpolation of time domain;
(c) the maximal value M of calculation procedure (b) acquired results
n, by step (b) acquired results divided by maximal value M
n, obtain the echoed signal after n-hour Amplitude Compensation;
(d) calculate the average of the echoed signal after all Amplitude Compensations between moment 1 to moment N-1, as with reference to signal, make computing cross-correlation with the echoed signal after n-hour Amplitude Compensation, obtain computing cross-correlation result;
(e) peaked position in search step (d) acquired results, as time delay value, carries out delay compensation to the echoed signal after n-hour Amplitude Compensation, obtains the echoed signal after n-hour delay compensation;
(f) to step (e) acquired results, adopt the index running mean background method that disappears mutually, complete the inhibition of n-hour coupled signal.
Fig. 2 suppresses without coupled signal the experimental result of processing in the time of detection close distance human body target through walls; Fig. 3 be index running mean background phase elimination in the time of detection close distance human body target through walls, be coupled suppress process experimental result; Fig. 4 be the present invention in the time of detection close distance human body target through walls, be coupled suppress process experimental result.Horizontal ordinate in Fig. 2, Fig. 3 and Fig. 4 represents the umber of pulse of processing, and ordinate represents detection range.Through-wall radar is surveyed experimental result and is shown, while suppressing to process without coupled signal, the target echo signal at 1.5m place is coupled signal completely and floods; Adopt index running mean background phase elimination can suppress coupled signal, but the residual coupled signal in 0.5m place is very strong; And the coupled signal inhibition method that the present invention proposes can effectively be eliminated Through-Wall Radar System and shakes the impact on coupled signal stability, not only successfully retain the human body target echo at 1.5m place, and effectively eliminated the coupled signal of other distance, solve the conventional background method residual larger problem while suppressing coupled signal that disappears mutually.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
1. a real-time inhibition method for through-wall radar coupled signal, is characterized in that, for utilize through-wall radar carry out through walls survey time obtain n-hour echoed signal, carry out following processing:
In the time of N=1, the echoed signal in this moment is carried out to 8 times of interpolation of time domain, the maximal value of the echoed signal based on after interpolation, the echoed signal after this moment interpolation of normalization, obtains the echoed signal after the Amplitude Compensation in this moment;
In the time of N >=2, first the echoed signal of n-hour is carried out to 8 times of interpolation of time domain; Secondly, based on after interpolation n-hour echoed signal maximal value, the echoed signal after normalization n-hour interpolation, obtains the echoed signal after the Amplitude Compensation of n-hour; Then, calculate the average of the echoed signal after all Amplitude Compensations between moment 1 to moment N-1, as with reference to signal, make computing cross-correlation with the echoed signal after n-hour Amplitude Compensation, search out in computing cross-correlation result peaked position as time delay value, the echoed signal after n-hour Amplitude Compensation is carried out to delay compensation; Finally, to the echoed signal after n-hour delay compensation, adopt the index running mean background method that disappears mutually, complete the inhibition to n-hour coupled signal.
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| CN103399302B (en) * | 2013-06-13 | 2014-12-10 | 中国人民解放军国防科学技术大学 | Wall clutter inhibition method based on spatial symmetry of wall-through array |
| CN105785453B (en) * | 2016-03-02 | 2017-11-10 | 湖南太康电子信息技术有限公司 | The adaptive indicating means of human body target after a kind of through-wall radar wall |
| CN105929375B (en) * | 2016-07-11 | 2017-08-25 | 湖南太康电子信息技术有限公司 | A kind of through-wall radar coupled signal suppressing method based on minimum mean square error criterion |
| CN110515089B (en) * | 2018-05-21 | 2023-06-02 | 华创车电技术中心股份有限公司 | Driving auxiliary method based on optical radar |
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