基于OMP算法的风轮机杂波滤除研究
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摘要
针对雷达在探测目标过程中风电场杂波的抑制问题,提出了一种基于正交匹配追踪(OMP)的杂波抑制算法。首先,建立风轮机的回波模型,分析了回波时频域特征;然后,推导了多径回波模型下的风轮机回波,介绍了风电场回波的特点;最后,给出了OMP算法的理论基础和实现步骤。该算法中,通过建立一个回波字典矩阵,寻找矩阵中最匹配原子,从目标信号中减去最匹配原子,并通过循环操作滤除杂波。实验结果表明:该方法能够有效滤除风轮机杂波。
Aiming at the suppression of wind farm clutter in the process of detecting targets, a clutter suppression algorithm based on orthogonal matching pursuit(OMP) is proposed in this paper. Firstly, the echo model of wind turbine is established in this paper, and the time-frequency domain characteristics of echo are analyzed. Then, the wind turbine echo under the multipath echo model is derived and the characteristics of the wind farm echo are introduced. Finally, the theoretical basis and implementation steps of the OMP algorithm are presented. The most matching atom in the matrix is found in an echo dictionary matrix established in this algorithm, which is subtracted from the target signal and the clutter is filtered out by the cyclic operation. Experimental results show that this method can effectively filter wind turbine clutter.
Aiming at the suppression of wind farm clutter in the process of detecting targets, a clutter suppression algorithm based on orthogonal matching pursuit(OMP) is proposed in this paper. Firstly, the echo model of wind turbine is established in this paper, and the time-frequency domain characteristics of echo are analyzed. Then, the wind turbine echo under the multipath echo model is derived and the characteristics of the wind farm echo are introduced. Finally, the theoretical basis and implementation steps of the OMP algorithm are presented. The most matching atom in the matrix is found in an echo dictionary matrix established in this algorithm, which is subtracted from the target signal and the clutter is filtered out by the cyclic operation. Experimental results show that this method can effectively filter wind turbine clutter.
引文
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[14] 王博.气象雷达抑制机场宽带杂波方法研究[J].现代雷达,2018,40(2):24-27.WANG Bo.A method of inhibition airport wideband clutter based on weather radar[J].Modern Radar,2018,40(2):24-27.
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[16] 朱晓秀,胡文华,郭宝锋.基于压缩感知理论的稀疏孔径ISAR成像[J].现代雷达,2018,40(10):18-22.ZHU Xiaoxiu,HU Wenhua,GUO Baofeng.ISAR imaging by exploiting sparse apertures based on compressive sensing[J].Modern Radar,2018,40(10):18-22.
[2] 何炜琨,吴仁彪,王晓亮,等.风电场对雷达设备的影响评估与干扰抑制技术研究现状与展望[J].电子与信息学报,2017,39(7):1748-1758.HE Weikun,WU Renbiao,WANG Xiaoliang,et al.The review and prospect on the influence evaluation and interference suppression of wind farms on the radar equipment[J].Journal of Electronics & Information Technology,2017,39(7):1748-1758.
[3] 张连迎,王聚杰.风电场对米波雷达系统的影响研究[J].装备环境工程,2017,14(7):41-44.ZHANG Lianying,WANG Jujie.Influences of wind farm on VHF radar system[J].Equipment Environmental Engineering,2017,14(7):41-44.
[4] AARHOLT E,JACKSON C A.Wind farm gapfiller concept solution[C]// The 7th European Radar Conference.Paris:IEEE Press,2010:236-239.
[5] BUTLER M M,JOHNSON D A.Feasibility of mitigating the effects of wind farms on primary radar[J].Alenia Marconi Systems Limited,2003,14(5):34-45.
[6] GALLARDO-HERNANDO B,MUNOZ-FERRERAS J M,PEREZ-MARTINEZ F.Super-resolution techniques for wind turbine clutter spectrum enhancement in meteorological radars[J].IET Radar,Sonar & Navigation,2011,5(9):924-933.
[7] GALLARDO B,PéREZ F,AGUADO F.Characterization approach of wind turbine clutter in the Spanish weather radar network[C]// The Fifth European Conference on Radar in Meteorology and Hydrology.Helsinki:Universidad Politecnica de Madrid Press,2008:221-225.
[8] DRAKE P.Overview of Raytheon wind farm mitigation techniques and test results[C]// CNS/ATM Annual Conference.Orlando:Raytheon Company,2011.
[9] KONG F,ZHANG Y,PALMER R.Wind turbine clutter mitigation for weather radar by adaptive spectrum processing[C]// 2012 IEEE Radar Conference.Atlanta:IEEE Press,2012:471-474.
[10] SERGEY L,HUBBARD O,DING Z,et al.Advanced mitigating techniques to remove the effects of wind turbines and wind farms on primary surveillance radars[C]// 2008 IEEE Radar Conference.Rome:IEEE Press,2008:1-6.
[11] WANG W Q.Detecting and mitigating wind turbine clutter for airspace radar systems[J].The Scientific World Journal,2013,10(4):67-75.
[12] JIA Q Q,WU R B,WANG X L.Recognition and suppression of wind farm clutter via dynamic clutter map[C]// 2012 IEEE 11th International Conference on Signal Processing.Beijing:IEEE Press,2013:1949-1952.
[13] 吴仁彪,毛建,王晓亮,等.航管一次雷达抗风电场干扰目标检测方法[J].电子与信息学报,2013,35(3):754-758.WU Renbiao,MAO Jian,WANG Xiaoliang,et al.Target detection of primary surveillance radar in wind farm clutter[J].Journal of Electronics & Information Technology,2013,35(3):754-758.
[14] 王博.气象雷达抑制机场宽带杂波方法研究[J].现代雷达,2018,40(2):24-27.WANG Bo.A method of inhibition airport wideband clutter based on weather radar[J].Modern Radar,2018,40(2):24-27.
[15] 何炜琨,石玉洛,王晓亮,等.风轮机雷达回波的仿真与分析[J].系统仿真学报,2015,27(1):50-56.HE Weikun,SHI Yuluo,WANG Xiaoliang,et al.Simulation and analysis of wind turbine echoes[J].Journal of System Simulation,2015,27(1):50-56.
[16] 朱晓秀,胡文华,郭宝锋.基于压缩感知理论的稀疏孔径ISAR成像[J].现代雷达,2018,40(10):18-22.ZHU Xiaoxiu,HU Wenhua,GUO Baofeng.ISAR imaging by exploiting sparse apertures based on compressive sensing[J].Modern Radar,2018,40(10):18-22.