基于最大似然估计的机载双基地雷达距离模糊杂波抑制方法  

Clutter Suppression Method for Airborne Bistatic Radar with Range Ambiguity Based on Maximum Likelihood Estimation

作　　者：张柏华[1,2] 谢文冲[2] 王永良[2] 张永顺[1] 

机构地区：[1]空军工程大学导弹学院,陕西三原713800 [2]空军雷达学院重点实验室,湖北武汉430019

出　　处：《电子学报》2011年第12期2836-2841,共6页Acta Electronica Sinica

摘　　要：针对存在距离模糊情况下机载双基地雷达杂波抑制的难题,本文分析了存在距离模糊时机载双基地雷达的杂波特性,提出了一种基于最大似然估计的机载双基地雷达距离模糊杂波抑制方法.该方法首先通过最大似然估计对训练样本所包含的各个模糊距离环的杂波幅度进行估计,然后通过非均匀采样重构待检测距离门及其模糊距离环的杂波数据,再由重构的杂波数据得到待检测距离门的杂波协方差矩阵,最后求得空时自适应处理权值,完成杂波抑制.仿真结果表明该方法具有较好的机载双基地雷达距离模糊杂波抑制性能.In this paper,the clutter characteristics of airborne bistatic radar with range ambiguity are analyzed,and a novel clutter suppression method based on maximum likelihood estimation is proposed.Firstly,the amplitude of various training samples including ambiguous ranges are estimated using maximum likelihood estimation.Secondly,clutter of cell under test（CUT） and the corresponding ambiguous ranges are rebuilt by non-uniform frequency sampling.Thirdly,the clutter covariance matrix of CUT is obtained from the rebuilt clutter data.Finally,clutter suppression is achieved by space-time adaptive processing weight from clutter covariance matrix.The simulation results show that the proposed method is more effective than the traditional method for clutter suppression of airborne bistatic radar with range ambiguity.

关 键 词：机载双基地雷达 距离模糊 杂波抑制 最大似然估计 空时自适应处理 

分 类 号：TN957.51[电子电信—信号与信息处理]