子空间约束秩1干扰下的雷达信号检测  

Radar signal detection with subspace constrained rank one interference

作　　者：邹鲲[1] 来磊 骆艳卜[1] 李伟[1] ZOU Kun;LAI Lei;LUO Yanbo;LI Wei(School of Information and Navigation,Air Force Engineering University,Xi’an 710077,China)

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077

出　　处：《系统工程与电子技术》2022年第1期94-99,共6页Systems Engineering and Electronics

基　　金：国家自然科学基金(61871396);博士后基金(2017M623352,2018T111148);陕西省自然科学基金(2020JM-343,2020JM352)资助课题。

摘　　要：考虑雷达待检测单元在受到子空间约束的秩1干扰情况下的自适应检测问题,即待检测单元背景噪声协方差矩阵中叠加有一个秩为1的干扰协方差矩阵,并假定干扰分量约束在一个已知的子空间内。采用双步广义似然比检验准则,得到子空间约束的秩为1的干扰检测器(subspace constrained rank one interference detector, SC-ROID)。还推导了一种降维自适应相干估计器(rank-reduced adaptive coherent estimator, rr-ACE),可以利用子空间的先验信息降低检测器计算量。计算机仿真分析表明,SC-ROID在无干扰或无干扰先验信息条件下,与自适应相干估计器性能相当,而在其他情况下具有较好的检测性能。而rr-ACE在小样本条件下的检测性能较好。To sdve adaptive detection problem that the cell under test is contaminated by the subspace constrained rank one interference, namely the noise covariance matrix of the test data is superposed by a rank one interference covariance matrix, the interference is assumed to be located in a known subspace, and using the 2-step generalized likelihood ratio test criterion, we derive a subspace constrained rank one interference detector(SC-ROID). We also derive a rank-reduced adaptive coherent estimator(rr-ACE), which exploits the prior information of the interference to reduce the computational load. The computer simulation results show that, under the condition of no interference or no prior information of the interference, the SC-ROID performance amounts to the adaptive coherent estimator detector. In other cases, the SC-ROID outperforms other conventional detectors. The rr-ACE outperforms other competitors when the size of the reference data is low.

关 键 词：自适应检测 秩1干扰 子空间约束干扰 广义似然比检验 降维 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]