星载方位多通道斜视SAR对运动目标成像方法  

Imaging Method for Moving Targets Using Spaceborne Squinted Azimuth Multichannel SAR

作　　者：王旭莹 张润宁[1] 王志斌 WANG Xuying;ZHANG Running;WANG Zhibin(Institute of Remote Sensing Satellite,China Academy of Space Technology,Beijing 100094,China)

机构地区：[1]中国空间技术研究院遥感卫星总体部,北京100094

出　　处：《航天器工程》2023年第5期16-24,共9页Spacecraft Engineering

摘　　要：由于受到斜视角和运动速度的影响,方位多通道合成孔径雷达(SAR)的方位模糊和速度模糊问题更加严重,从而影响斜视模式下运动目标的多通道重建与成像。为了解决该问题,文章提出了一种星载方位多通道斜视SAR运动目标成像方法。首先,分析并建立斜视模式下运动目标精确回波模型,然后,基于谱估计及改进Radon变换实现运动目标无模糊径向速度估计,对目标二维频谱进行匹配滤波实现运动目标成像。最后,点目标仿真实验验证了该方法的有效性。Due to the influence of squint angle and motion velocity,the problem of azimuth ambiguity and velocity ambiguity in azimuth multichannel synthetic aperture radar(SAR)are more serious,which affects the multichannel reconstruction and imaging of moving targets in squint mode.To resolve this problem,this paper proposes an imaging method for moving targets using satellite borne squinted azimuth multichannel SAR.Firstly,the accurate echo model of the moving targets in squint mode is analyzed and established,then the unambiguous radial velocity estimation of the moving targets is realized based on the spectral estimation and improved Radon Transform,and the imaging of the moving targets is realized by matched filtering on the target’s two-dimensional spectrum.Finally,the effectiveness of this method is verified by the point targets simulation experiments.

关 键 词：方位多通道SAR 斜视成像 运动目标 径向速度估计 

分 类 号：TN958[电子电信—信号与信息处理]