一种改进的被动雷达直达干扰抑制方案
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摘要
研究被动雷达系统中直达信号干扰的抑制问题.针对实际场景中系统主通道与参考通道之间存在频域与时域上的链路差异,提出一种改进的直达干扰抑制方案.利用最大似然原理对参考通道与主通道的频差进行补偿,使用分层搜索的方法降低算法复杂度,进而基于解卷积的算法对时域失真进行恢复.仿真结果显示,与现有方案相比,所提出方案能够克服通道链路差异带来的不利影响,精确重构出主通道中的直达干扰信号,实现更佳的干扰抑制效果,具有很好的实用价值.
In this paper, direct path interference cancellation for a passive radar system is investigated. A new cancellation scheme is proposed to address inevitable hardware discrepancy between the surveillance channel and the reference channel.In the proposed scheme, firstly, the frequency deviation between the two channels is reduced based on the maximum likelihood principle, and the hierarchical search method is used to reduce the complexity, then the distortion in time domain is compensated via a de-convolutional algorithm. The numerical results show that, the proposed scheme can effectively compensate the discrepancy between the two channels and reconstruct the direct interference signals in the surveillance channel accurately, which can improve the interference cancellation performance and is attractive in practical scenarios.
In this paper, direct path interference cancellation for a passive radar system is investigated. A new cancellation scheme is proposed to address inevitable hardware discrepancy between the surveillance channel and the reference channel.In the proposed scheme, firstly, the frequency deviation between the two channels is reduced based on the maximum likelihood principle, and the hierarchical search method is used to reduce the complexity, then the distortion in time domain is compensated via a de-convolutional algorithm. The numerical results show that, the proposed scheme can effectively compensate the discrepancy between the two channels and reconstruct the direct interference signals in the surveillance channel accurately, which can improve the interference cancellation performance and is attractive in practical scenarios.
引文
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[7]杜超.数字电视外辐射源雷达干扰抑制和微弱目标检测技术研究[D].北京:北京理工大学信息与电子学院,2015.(Du C.Research on interference cancellation and weak target detection for DTV based passive radar[D].Beijing:School of Information and Electronics,Beijing Institute of Technology,2015.)
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[10]Zeng Yonghu.Experimental research of dual-polarization passive radar based on DTTB signal[J].J of Computer&Communications,2016,4(3):101-107.
[11]Colone F,Cardinali R,Lombardo P.Cancellation of clutter and multipath in passive radar using a sequential approach[C].IEEE Conf on Radar.Verona:IEEE,2006:393-399.
[12]Colone F,Hagan F O’,Lombardo D W,et al.A multistage processing algorithm for disturbance removal and target detection in passive bistatic radar[J].IEEE Trans on Aerospace and Electronic Systems,2009,45(2):698-722.
[13]Guan Xin,Zhong Lihua,Hu Donghui,et al.Adaptive direct signal and clutter cancellation based on phase-offset block least mean square filter in passive radar[C].Int Conf on Signal Proc(ICSP).Hangzhou:IEEE,2014:2158-2162.
[14]Guan Xin,Hu Donghui,Zhong Lihua,et al.Strong echo cancellation based on adaptive block notch filter in passive radar[J].Geoscience and Remote Sensing Letters,2015,12(2):339-343.
[15]Niedzwiecki M.Generalized adaptive notch smoothing revisited[J].IEEE Trans on Signal Processing,2010,58(3):1565-1576.
[16]Zhang Xin.Joint delay and doppler estimation for passive sensing with direct-path interference[J].IEEE Trans on Signal Processing,2016,64(3):630-640.
[17]Haimovich A M,Blum A M,Cimini R S,et al.MIMO radar with widely separated antennas[J].Signal Processing Magazine,2008,25(1):116-129.
[2]Skolnik M I,谢卓.雷达手册[M].北京:国防工业出版社,2003:3-20.(Skolnik M I,Xie Z.Radar handbook[M].Beijing:National Defense Industry Press,2003:3-20.)
[3]李斌,胡可生.无源雷达信号处理及定位系统研究[J].科技视界,2016,20(1):1-2.(Li B,Hu K S.Research on information processing and location technology of passive radar[J].Science&Technology Vision,2016,20(1):1-2.)
[4]Griffiths H D.From a different perspective:Principles,practice and potential of bistatic radar[C].Proc of the Int Conf on Radar.Adelaide:IEEE,2003:1-7.
[5]杨进佩,刘中,朱晓华.用于无源雷达的GPS卫星信号性能分析[J].电子与信息学报,2007,29(5):1083-1086.(Yang J P,Liu Z,Zhu X H.The performances analysis of GPS signals for passive radar[J].J of Electronics&Information Technology,2007,29(5):1083-1086.)
[6]张超纲.外辐射源雷达中直达波和干扰信号的抑制[D].成都:电子科技大学电子工程学院,2010.(Zhang C G.Suppression of direct and interfering signals in an external source radar[D].Chengdu:School of Electronic University of Electronic Science and Technology of China,2010.)
[7]杜超.数字电视外辐射源雷达干扰抑制和微弱目标检测技术研究[D].北京:北京理工大学信息与电子学院,2015.(Du C.Research on interference cancellation and weak target detection for DTV based passive radar[D].Beijing:School of Information and Electronics,Beijing Institute of Technology,2015.)
[8]Garry J L,Smith G E,Baker C J.Direct signal suppression schemes for passive radar[C].Signal Processing Symposium.Debe:IEEE,2015:1-5.
[9]Cardinali R,Colone F,Ferretti C,et al.Comparison of clutter and multipath cancellation techniques for passive radar[C].IEEE 2007 Radar Conf.Boston:IEEE,2007:469-474.
[10]Zeng Yonghu.Experimental research of dual-polarization passive radar based on DTTB signal[J].J of Computer&Communications,2016,4(3):101-107.
[11]Colone F,Cardinali R,Lombardo P.Cancellation of clutter and multipath in passive radar using a sequential approach[C].IEEE Conf on Radar.Verona:IEEE,2006:393-399.
[12]Colone F,Hagan F O’,Lombardo D W,et al.A multistage processing algorithm for disturbance removal and target detection in passive bistatic radar[J].IEEE Trans on Aerospace and Electronic Systems,2009,45(2):698-722.
[13]Guan Xin,Zhong Lihua,Hu Donghui,et al.Adaptive direct signal and clutter cancellation based on phase-offset block least mean square filter in passive radar[C].Int Conf on Signal Proc(ICSP).Hangzhou:IEEE,2014:2158-2162.
[14]Guan Xin,Hu Donghui,Zhong Lihua,et al.Strong echo cancellation based on adaptive block notch filter in passive radar[J].Geoscience and Remote Sensing Letters,2015,12(2):339-343.
[15]Niedzwiecki M.Generalized adaptive notch smoothing revisited[J].IEEE Trans on Signal Processing,2010,58(3):1565-1576.
[16]Zhang Xin.Joint delay and doppler estimation for passive sensing with direct-path interference[J].IEEE Trans on Signal Processing,2016,64(3):630-640.
[17]Haimovich A M,Blum A M,Cimini R S,et al.MIMO radar with widely separated antennas[J].Signal Processing Magazine,2008,25(1):116-129.