部分均匀环境下适用于空间对称线阵的修正广义似然比检测方法  

Modified Generalized Likelihood Ratio Test Detection Based on a Symmetrically Spaced Linear Array in Partially Homogeneous Environments

作　　者：闫林杰 郝程鹏[1,2] 殷超然 孙苇轩 侯朝焕 YAN Linjie;HAO Chengpeng;YIN Chaoran;SUN Weixuan;HOU Chaohuan(Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院声学研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《雷达学报（中英文）》2021年第3期443-452,共10页Journal of Radars

基　　金：国家自然科学基金(61971412)。

摘　　要：针对部分均匀高斯干扰环境下的点目标检测问题,该文基于广义似然比准则(GLRT)提出一种适用于空间对称线阵的修正GLRT检测方法。考虑到采样时存在的目标能量泄漏,在接收信号建模时采用目标能量泄漏采样模型弥补泄漏损失,并基于干扰协方差矩阵的斜对称结构降低对辅助数据的需求,最终联合待检测数据和辅助数据实现未知参数的估计,得到兼具有良好目标检测和距离估计性能的斜对称修正GLRT检测方法。仿真结果表明,该方法不仅在部分均匀环境下具有恒虚警特性,而且在辅助数据数量受限时,相比其同类型的检测方法具有1 dB以上的检测性能优势。To address the problem of detecting point-like targets in a partially homogeneous Gaussian cluttered environment,we developed a modified Generalized Likelihood Ratio Test(GLRT)detection method based on a symmetrically spaced linear array that relies on a GLRT design criterion.Considering the target energy spillover during sampling,we use a spillover model of the target energy to decrease spillover loss.To establish the discrete-time signal mode,we use a persymmetric structure of the disturbance covariance matrix to reduce the requirement for auxiliary signals.Lastly,we estimate all of the unknown parameters based on a consideration of both primary and secondary data to derive the persymmetric modified GLRT detector,which has good target detection and range estimation performance.The performance assessment shows that the proposed method not only performs as a constant false-alarm-rate receiver in partially homogeneous environments but also guarantees superior detection performance relative to that of its competitors.In samplestarved environments,compared with other detection methods of the same type,it realizes a detection performance advantage greater than 1 dB.

关 键 词：部分均匀环境 广义似然比检测准则 斜对称特性 目标能量泄漏 点目标检测 恒虚警 

分 类 号：TN957.51[电子电信—信号与信息处理]