基于知识辅助的天波雷达海杂波抑制方法
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摘要
针对天波雷达海杂波难以抑制且现有方法未充分利用先验知识的问题,提出基于知识的天波雷达海杂波抑制方法。所提方法利用脉冲重复周期、雷达工作频率、海平面风向、风速作为先验知识,结合海杂波谱模型及提出的基于知识的海杂波协方差矩阵估计方法,构造出基于知识的天波雷达海杂波协方差矩阵,将该矩阵加入最优滤波器设计中,得到基于知识辅助的天波雷达海杂波抑制方法。仿真结果表明,与现有方法相比,所提方法的海杂波抑制效果可提升3dB以上。
Because the ocean clutter is difficult to be suppressed in sky-wave radar and existing methods do not use the prior knowledge effectively,this paper proposes a knowledge-aided ocean clutter suppression method for sky-wave radar.The proposed method uses pulse repetition interval,radar carrier frequency and the direction and speed of wind upon sea level as prior knowledge.Combining the ocean spectrum model,the proposed knowledge-aided ocean clutter covariance estimation method and the prior knowledge,we can get the knowledge-aided ocean clutter covariance matrix.Add this matrix to the optimal filter design and we get the knowledge-aided suppression method for sky-wave radar.The simulation results show that,the proposed method can get 3 dB bigger output signal to clutter plus noise rate than existing methods.
Because the ocean clutter is difficult to be suppressed in sky-wave radar and existing methods do not use the prior knowledge effectively,this paper proposes a knowledge-aided ocean clutter suppression method for sky-wave radar.The proposed method uses pulse repetition interval,radar carrier frequency and the direction and speed of wind upon sea level as prior knowledge.Combining the ocean spectrum model,the proposed knowledge-aided ocean clutter covariance estimation method and the prior knowledge,we can get the knowledge-aided ocean clutter covariance matrix.Add this matrix to the optimal filter design and we get the knowledge-aided suppression method for sky-wave radar.The simulation results show that,the proposed method can get 3 dB bigger output signal to clutter plus noise rate than existing methods.
引文
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[2]ROOT B T.HF-over-the-horizon radar ship detection with short dwells using clutter cancelation[J].Radio Science,2016,33(4):1095-1111.
[3]GUO X.The ship detection of sky wave over-the-horizon radar with short coherent integration time[J].Journal of Electronics&Information Technology,2004,26(4):613-618.
[4]XUE Y,YANG L,HAYKIN S.Decoupled echo state networks with lateral inhibition[J].Neural Networks,2007,20(3):365-376.
[5]WANG G,XIA X G,ROOT B T,et al.Manoeuvring target detection in over-the-horizon radar using adaptive clutter rejection and adaptive chirplet transform[J].IEE Proceedings Radar,Sonar and Navigation,2003,150(4):292-298.
[6]TANG Y,LUO X,YANG Z.Ocean clutter suppression using one-class SVM[C]∥Proc.of the IEEE Signal Processing Society Workshop on Machine Learning for Signal Processing,2005:559-568.
[7]ZHAO Z,CHEN J,ZHENG B.A method to estimate subspace via Doppler for ocean clutter suppression in skywave radars[C]∥Proc.of the IEEE CIE International Conference on Radar,2011:145-148.
[8]WU P,WANG J,WANG W.A novel method of small target detection in sea clutter[J].Isrn Signal Processing,2014,2011(2011).
[9]HU J,ZHU H,LI H,et al.Sea clutter suppression and weak target signal enhancement using an optimal filter[J].IEICE Trans.on Fundamentals of Electronics Communications&Computer Sciences,2016,99(1):433-436.
[10]周宇,张林让,刘楠,等.空时自适应处理中基于知识的训练样本选择策略[J].系统工程与电子技术,2010,32(2):405-409.ZHOU Y,ZHANG L R,LIU N,et al.Knowledge aided secondary data selection in space time adaptive processing[J].Systems Engineering and Electronics,2010,32(2):405-409.
[11]CAPRARO C T,CAPRARO G T,BRADARIC I,et al.Implementing digital terrain data in knowledge aided space-time adaptive processing[J].IEEE Trans.on Aerospace and Electronic Systems,2006,42(3):1080-1099.
[12]陆达,张弓.知识辅助的机载MIMO雷达降秩STAP算法[J].数据采集与处理,2012,27(4):429-435.LU D,ZHANG G.Knowledge-aided reduced-rank STAP algorithm for airborne MIMO radar[J].Journal of Data Acquisition&Processing,2012,27(4):429-435.
[13]李晓明,冯大政,夏宇垠,等.基于重构协方差矩阵空时二维杂波抑制方法[J].系统工程与电子技术,2008,30(12):2366-2370.LI X M,FENG D Z,XIA Y Y,et al.Method for clutter suppression based on covariance matrix reconstruction in airborne radar[J].Systems Engineering and Electronics,2008,30(12):2366-2370.
[14]刘聪锋,廖桂生.基于Bayes准则的STAP协方差矩阵估计算法[J].西安电子科技大学学报(自然科学版),2008,35(2):223-227.LIU C F,LIAO G S,Covariance matrix estimation for the STAP based on the Bayes criterion[J].Journal of Xidian University(Science and Technology),2008,35(2):223-227.
[15]文必洋,石振华.高频雷达海洋回波谱的数字模拟[J].武汉大学学报,2000,46(1):127-130.WEN I Y,SHI Z H.Numerical simulation for the sea echo spectrum of HF radar[J].Wuhan University Journal,2000,46(1):127-130.
[16]BARRICK D.First-order theory and analysis of MF/HF/VHF scatter from the sea[J].IEEE Trans.on Antennas and Propagation,1972,20(1):2-10.
[17]BARRICK D.Remote sensing of sea state by radar[C]∥Proc.of the IEEE International Conference on Engineering in the Ocean Environment,1972:186-192.
[18]WU Y,WANG T,WU J,et al.Robust training samples selection algorithm based on spectral similarity for space-time adaptive processing in heterogeneous interference environments[J].IET Radar,Sonar and Navigation,2015,9(7):778-782.