一种新的双通道SAR动目标检测方法  

A New Moving Target Detection Method for Dual-Channel SAR System

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作  者:田斌[1] 王伟[1] TIAN Bin;WANG Wei(Xi'an electronics and engineering Research Institute, Xi'an 710100)

机构地区:[1]西安电子工程研究所,西安710100

出  处:《火控雷达技术》2021年第4期13-19,30,共8页Fire Control Radar Technology

摘  要:针对机载双通道SAR/GMTI系统,本文提出了一种稳健的地面慢动目标检测方法。文中首先对基于样本协方差矩阵特征值分解的一类动目标检测算法的基本工作原理及各算法存在的优缺点进行了分析;在此基础上,针对该类动目标检测算法稳健性差的缺点,将第二特征值和归一化相位门限预处理引入到双曲线检测算法中,提出一种稳健的双通道SAR动目标检测方法。理论分析和仿真实验结果表明:与其它基于样本协方差矩阵特征分解的动目标检测算法相比,该算法具有杂波抑制能力强、可检测速度范围大和算法的检测性能受强点状杂波、相位漂移和随机噪声的影响小等优点。A moving target detection method is proposed for airborne dual-channel SAR/GMTI system.This paper firstly analyzes the principle of moving target detection methods based on Eigen-decomposition of the sample covariance matrix(SCM).Meanwhile,the advantages and disadvantages of the mentioned methods are also discussed.With the consideration of improving the robustness of moving target detection approach,the second eigenvalue and the independent unitary phase pre-thresholds are introduced before a hyperbola detector and a stable approach to detect moving targets is therefore proposed.According to the theoretical analysis and experimental results on simulated SAR data,when compared with other moving target detection methods using the eigen-decomposition of the SCM,the proposed one can achieve better clutter rejection,has wider range of detection velocity and eliminates influences from the strong clutter,noise and phase excursion.

关 键 词:双通道SAR系统 动目标检测 特征值分解 恒虚警检测 

分 类 号:TN95[电子电信—信号与信息处理]

 

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