基于零陷展宽的空域海杂波抑制算法  

Sea clutter suppression algorithm in spatial domain based on null widening

作　　者：东松林 岳显昌[1] 吴雄斌[1] 易先洲 DONG Songlin;YUE Xianchang;WU Xiongbin;YI Xianzhou(Wuhan University,School of Electronic Information,WuHan 430072,China)

机构地区：[1]武汉大学电子信息学院,湖北武汉430072

出　　处：《湘潭大学学报（自然科学版）》2022年第3期46-56,共11页Journal of Xiangtan University(Natural Science Edition)

基　　金：科技部重点研发计划(2016YFC1401101);湖北省重点研发计划(2020BCA080);广东省重点领域研发计划(2020B1111020005)。

摘　　要：为抑制海杂波检测高频地波雷达(high frequency surface wave radar,HFSWR)中的目标,提出了基于零陷展宽(null widening,NW)的空域海杂波抑制算法.NW算法利用海洋运动的连续性和海杂波的弥散性,基于干扰位置变化规律构造加权干扰NW矩阵,从阵列中抑制海杂波并保留目标.与其他海杂波抑制算法对比,利用新的波束形成方法将干扰零陷方向展宽,不改变噪声项贡献,从而有效抑制海杂波.利用NW算法在空域抑制海杂波时,根据实际应用环境计算修正矩阵,在实时信号处理过程中不仅运算速度快,而且提高了输出信号杂波噪声比(signal to clutter plus noise ratio,SCNR),针对海杂波抑制效果较好,有助于后续信号处理目标检测工作.In order to suppress sea clutter to detect targets in high frequency surface wave radar(HFSWR),this paper proposes a sea clutter suppression algorithm in spatial domain based on null widening(NW).The NW algorithm utilizes the continuity of ocean motion and the dispersion of sea clutter,constructs a weighted jamming NW matrix based on the variation law of jamming position,suppresses sea clutter from the array and retains the target.Compared with other sea clutter suppression algorithms,the new beamforming method is used to broaden the interference null direction without changing noise contribution,thereby effectively suppressing sea clutter.Using the NW clutter suppression algorithm in spatial domain,the correction matrix is calculated according to the actual application environment.In the real-time signal processing process,not only the calculation speed is fast,but also the output signal to clutter plus noise ratio(SCNR)is improved,for sea clutter suppression effect is better,helpful for subsequent signal processing target detection work.

关 键 词：零陷展宽(NW) 海杂波抑制 空域 目标检测 高频地波雷达(HFSWR) 

分 类 号：TN957[电子电信—信号与信息处理]