基于距离走动效应的SAR运动目标检测算法  

Moving target indication algorithm in SAR based on range walk migration

作　　者：杨健[1] 杨文付 谢晓阳[1] 鲍文卓 YANG Jian;YANG Wenfu;XIE Xiaoyang;BAO Wenzhuo(China Academy of Launch Vehicle Technology,Beijing 100076,China)

机构地区：[1]中国运载火箭技术研究院,北京100076

出　　处：《太赫兹科学与电子信息学报》2018年第3期406-411,共6页Journal of Terahertz Science and Electronic Information Technology

摘　　要：针对单通道合成孔径雷达无法检测慢速地面运动目标(GMTI)的问题,提出了一种基于距离走动效应对运动目标检测的新算法。首先对运动目标的回波频谱进行详细分解,提取了运动目标在距离压缩后距离走动曲线与地面静止目标的区别。基于此区别,通过对距离压缩后图像附加一对符号相反的距离走动相位,并在图像域对附加相位后的图像进行对消,可实现图像域地杂波的对消,以及运动目标的检测。通过设计仿真试验,验证了该算法可在图像域对静止回波进行有效抑制,从而检测出混叠在地杂波中的慢速运动目标。A novel Ground Moving Target Indication（GMTI） algorithm is presented to detect slow moving targets by using the range walk migration in single-antenna synthetic aperture radar. Two filters,which differ only in signs of phase responses, are utilized to change the range walk migration rates of the echo after the range compression, and two images are generated therewith. In the two images, stationary targets have the same range walk migration rates after the filtering; nevertheless, the range walk migration rates of the moving targets are different. Therefore, moving targets can be indicated by the complex subtraction of the two images. Simulations are conducted to prove that slow moving targets which are submerged by the clutter can be detected by the proposed algorithm.

关 键 词：地面运动目标检测 距离走动效应 单通道 合成孔径雷达 

分 类 号：TN955.2[电子电信—信号与信息处理]