基于正交投影的子带信息几何雷达弱小目标检测方法  

Subband Information Geometry Detection Method Based on Orthogonal Projection for Weak Radar Targets

作　　者：杨政 程永强 吴昊[1] 黎湘[1] 王宏强[1] YANG Zheng;CHENG Yongqiang;WU Hao;LI Xiang;WANG Hongqiang(College of Electronic Science and Technology,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学电子科学学院,长沙410073

出　　处：《雷达学报（中英文）》2023年第4期776-792,共17页Journal of Radars

基　　金：国家自然科学基金(61921001),湖南省杰出青年基金(2022JJ10063)。

摘　　要：基于信息几何理论的雷达目标检测是一种新兴的技术,它将目标检测问题转化为流形上目标与杂波的区分问题,在低信杂比检测中具有优势。对于复杂背景下的弱小目标检测,目标与杂波难以区分,限制着检测性能。因此,该文基于矩阵信息几何检测器,提出一种基于正交投影的子带信息几何目标检测方法。该文利用滤波器组对雷达回波信号进行子带分解,并在矩阵流形上稳健估计子带内强杂波信号子空间,提出基于流形的正交投影方法以抑制强杂波,增强目标与杂波的区分性。最后,采用仿真数据和实测海杂波数据验证所提方法的有效性。结果表明,所提方法能够有效抑制强杂波,具有较好的检测性能。Herein,a novel and effective method for detecting radar targets with a low signal-to-clutter ratio is proposed based on the information geometry theory.In the proposed method,the target detection problem is converted to distinguishing the target from a clutter background on a manifold.However,this is challenging when dealing with small and weak targets embedded in a complex and strong clutter background,which limits the detection performance.Therefore,to address this issue,an orthogonal projection based subband information geometry detection method is proposed.In this method,the received radar signal undergoes subband decomposition by a designed filter bank,and the robust estimation of clutter signal subspace in each subband is implemented on the matrix manifold.Subsequently,the suppression of the strong clutter is achieved through orthogonal projection based on the manifold,thereby improving the discrimination between the target and the clutter.Finally,the effectiveness of the proposed method is evaluated using simulated and real sea clutter data.The experimental results confirm that the proposed method effectively suppresses strong clutter and exhibits excellent detection performance.

关 键 词：雷达弱小目标检测 信息几何 矩阵流形 子带分解 正交投影 杂波抑制 

分 类 号：TN957.51[电子电信—信号与信息处理]