一种单通道SAR对多个地面动目标定位的方法  

A Method for Multiple Ground Moving Targets Location in Single-Channel SAR System

作　　者：易航[1] 黄晓涛[1] 李杨寰[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《计算机仿真》2010年第6期6-9,30,共5页Computer Simulation

基　　金：教育部新世纪优秀人才支持计划(NCET-07-0223)

摘　　要：针对动目标的图像会因为存在径向速度而产生方位偏移问题,即动目标不能成像至正确的方位位置上。采用常规的用于静止目标成像的SAR(Synthetic Aperture Radar)方法对地面动目标成像,对单通道合成孔径雷达(Single-Channel SAR)正侧视工作模式下的多个地面动目标的定位问题进行了研究。首先分析了多个运动目标回波信号的特征,接着根据运动目标回波信号及其频谱的特征估计出了每个运动目标的多普勒中心和多普勒调频率,再利用多普勒参数的估计结果实现了距离走动校正,并计算动目标的运动参数,最后对动目标重新聚焦得到其初始时刻的图像,完成了运动目标的定位。并通过仿真实验验证了方法能准确的估计各个动目标的速度及位置参数,证明了算法的有效性。If the moving target returns are processed in the conventional imaging way which is for static targets, the resulting SAR image of moving targets appears misplaced in the cross - range because of the slant - range velocity, that is to say, moving targets can not be imaged to correct positions. To solve this problem, the relocation of multiple ground moving targets in a Single - Channel SAR system is studied in this paper. The echo of multiple moving targets are analyzed, the Doppler parameters are estimated for each target by making use of the echo and spectrum, Range Walk is corrected and the moving parameters are computed by using the estimated results. At last, images of the moving targets are achieved, a,d the ground moving targets are relocated. The simulation results show that this method can estimate the parameters with high accuracy, and it is an effectual algorithm.

关 键 词：合成孔径雷达 多个运动目标定位 参数估计 

分 类 号：TN957[电子电信—信号与信息处理]