基于平方根分解的干扰加噪声背景下距离扩展目标子空间检测器  

Square root decomposition based range-spread target subspace detector in interference-plus-noise background

作　　者：刘旭 魏广芬[1] 简涛 罗沅 周战 朱智林[1] LIU Xu;WEI Guangfen;JIAN Tao;LUO Yuan;ZHOU Zhan;ZHU Zhilin(School of Information and Electronic Engineering,Shandong Technology and Business University,Yantai 264005,China;Research Institute of Information Fusion,Naval Aviation University,Yantai 264001,China)

机构地区：[1]山东工商学院信息与电子工程学院,山东烟台264005 [2]海军航空大学信息融合研究所,山东烟台264001

出　　处：《微电子学与计算机》2023年第7期36-44,共9页Microelectronics & Computer

基　　金：国家自然科学基金面上项目(61971432)。

摘　　要：研究了子空间干扰加未知噪声背景下的距离扩展目标检测问题.将目标和干扰均建模为已知子空间内具有未知坐标的信号,且目标信号子空间包含在干扰信号子空间内.利用一组包含干扰和噪声的辅助数据估计干扰协方差矩阵,采用平方根分解方法变换干扰矩阵结构,进而求解干扰坐标协方差矩阵、噪声功率和目标信号坐标的最大似然估计,基于一步法设计策略建立广义似然比检验检测器.理论分析表明,所提出的检测器对干扰加噪声的协方差矩阵具有恒虚警率特性.仿真分析表明,在与目标信号相关的干扰加未知噪声背景下,所提出的距离扩展目标子空间检测器的检测性能优于已有对比检测器,且能有效抑制不同功率的子空间干扰信号.The problem of range-spread target detection in the background of subspace interference plus unknown noise is studied.Both target and jamming are modeled as signals with unknown coordinates in a known subspace,and the target signal subspace is contained in the jamming signal subspace.A group of secondary data containing interference and noise is used to estimate the interference covariance matrix.The square root decomposition method is adopted to transform the interference matrix structure,and then the maximum likelihood estimation of unknown interference coordinate covariance matrix,noise power and target signal coordinates is resolved.Based on the one-step design strategy,a generalized likelihood ratio test detector is established.Theoretical analysis shows that the covariance matrix of the proposed detector for interference plus noise has a constant false alarm rate characteristic.Simulation analysis shows that the detection performance of the proposed range-spread target subspace detector is better than that of the existing comparison detector under the background of interference related to the target signal plus unknown noise,and it can effectively suppress the subspace interference signals of different powers.

关 键 词：距离扩展目标 子空间信号 广义似然比检验 恒虚警率特性 平方根分解 

分 类 号：TN957.51[电子电信—信号与信息处理]