基于ASTFT和中值滤波的PRC-CW雷达FM干扰抑制方法
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摘要
通过分析调频(FM)干扰对伪码调相连续波雷达相关检测性能的影响,发现当FM干扰超出伪码调相雷达自身抗干扰容限时,相关输出严重恶化。针对该问题,考虑到伪码在时频平面上是近似均匀和平坦的,而FM干扰则具有较好的时频聚集性,该文提出了基于自适应短时傅里叶变换(ASTFT)和中值滤波的FM干扰抑制方法。该方法通过对时频平面上被干扰污染的部分进行中值滤波,实现了对FM干扰的抑制。对不同信干比情况下线性调频和正弦调频干扰抑制前后的相关输出进行了仿真分析。结果表明,该方法能够有效抑制干扰,使相关输出得到显著改善。
The influence of frequency modulation(FM) interference on correlation detection performance of the pseudo random code continuous wave(PRC-CW)radar is analyzed.It is found that the correlation output deteriorates greatly when the FM interference power exceeds the anti-jamming limitation of the radar.According to the fact that the PRC-CW radar return signal is a wideband pseudo random signal occupying the whole time-frequency(TF) plane,whereas the FM interference signal is well concentrated in the TF plane,a new method is proposed based on adaptive short-time Fourier transform(ASTFT) and median filtering for FM interference suppression.This method implements the filtering of the received signal by substituting the median filter output for only a portion of the TF plane corrupted by the interference.The echo signals corrupted by two types of interferences including linear FM(LFM)and sinusoidal FM(SFM)forms under different signal-to-jamming ratio(SJR)situations are simulated.It is shown that the method can effectively suppress the FM interference and improve the performance of target detection significantly.
The influence of frequency modulation(FM) interference on correlation detection performance of the pseudo random code continuous wave(PRC-CW)radar is analyzed.It is found that the correlation output deteriorates greatly when the FM interference power exceeds the anti-jamming limitation of the radar.According to the fact that the PRC-CW radar return signal is a wideband pseudo random signal occupying the whole time-frequency(TF) plane,whereas the FM interference signal is well concentrated in the TF plane,a new method is proposed based on adaptive short-time Fourier transform(ASTFT) and median filtering for FM interference suppression.This method implements the filtering of the received signal by substituting the median filter output for only a portion of the TF plane corrupted by the interference.The echo signals corrupted by two types of interferences including linear FM(LFM)and sinusoidal FM(SFM)forms under different signal-to-jamming ratio(SJR)situations are simulated.It is shown that the method can effectively suppress the FM interference and improve the performance of target detection significantly.
引文
[1]Zhou X G,Zhao HC,Tu Y C.Performance analysis ofanti-noise FM jamming of pseudo-random code binaryphase modulation fuze based on Doppler effect[A].Proc IEEE 2007 International Symposium on Micro-wave,Antenna,Propagation and EMC technologies forWireless Communications[C].Hangzhou:IEEE,2007:1424-1427.
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[4]张淑宁,赵惠昌,吴兵.基于分数阶傅立叶变换的伪码体制引信线性调频干扰抑制技术[J].兵工学报,2006,27(1):32-36.
[5]张淑宁,赵惠昌,涂友超.基于FRFT的伪码引信自适应LFM干扰对消方法[J].电子与信息学报,2008,30(5):1084-1087.
[6]刘洋,刘财,王典,等.时变中值滤波技术在地震随机噪声衰减中的应用[J].石油地球物理勘探,2008,43(3):327-332.
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[8]徐春光,谢维信.一种高分辨自适应信号时频表示[J].西安电子科技大学学报,1999,26(6):718-723.
[9]O’Neil J C.Quartic function for time-frequency anal-ysis with application to signal adaptive kernel design[A].Proc SPIE[C].San Diego:SPIE,1997:14-25.
[2]涂友超,赵惠昌,周新刚.伪码体制引信抗瞄准式噪声调幅干扰性能研究[J].南京理工大学学报(自然科学版),2008,32(3):350-355.
[3]Barbarossa S,Scaglione A.Adaptive time varying can-cellation of wideband interferences in spread spectrumcommunications based on time-frequency distributions[J].IEEE Trans Signal Processing,1999,4:957-965.
[4]张淑宁,赵惠昌,吴兵.基于分数阶傅立叶变换的伪码体制引信线性调频干扰抑制技术[J].兵工学报,2006,27(1):32-36.
[5]张淑宁,赵惠昌,涂友超.基于FRFT的伪码引信自适应LFM干扰对消方法[J].电子与信息学报,2008,30(5):1084-1087.
[6]刘洋,刘财,王典,等.时变中值滤波技术在地震随机噪声衰减中的应用[J].石油地球物理勘探,2008,43(3):327-332.
[7]Zhao Z,Shi X Q,Ding D Z.Short-range MMW PRC-CW radar utilizing Doppler compensation[A].Proc IntConf Microwave and Millimeter Wave Technology[C].Nanjing:IEEE,2008:1384-1387.
[8]徐春光,谢维信.一种高分辨自适应信号时频表示[J].西安电子科技大学学报,1999,26(6):718-723.
[9]O’Neil J C.Quartic function for time-frequency anal-ysis with application to signal adaptive kernel design[A].Proc SPIE[C].San Diego:SPIE,1997:14-25.
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