天基视频SAR系统设计及成像算法研究  

Research on spaceborne video SAR system design and image formation algorithm

作　　者：梁健[1,2] 张润宁[1] 包敏凤 

机构地区：[1]航天东方红卫星有限公司,北京100094 [2]中国空间技术研究院神舟学院,北京100086

出　　处：《中国空间科学技术》2016年第6期22-28,共7页Chinese Space Science and Technology

摘　　要：视频合成孔径雷达(Synthetic Aperture Radar,SAR)作为一种新型微波遥感体制,能够实现对热点区域动态目标的持续监视,目前对视频SAR的研究主要集中在机载平台的视频SAR系统,未对天基视频SAR系统设计及成像算法展开深入研究。文章设计了一种基于双站模式的天基视频SAR系统,其中以静止轨道SAR卫星作为发射源,并利用低轨SAR卫星接收目标区域的回波信号。研究了视频SAR成像性能与各主要工程参数间的关系,并提出一种适用于天基视频SAR的成像算法,该算法能够有效解决双站天基视频SAR成像中大斜视角应用与数据重叠等问题,成像结果正确反映了运动目标的散焦、移位现象,同时静止目标取得了良好的聚焦效果。As a new microwave remote sensing mode, a video SAR can provide a continuous surveillance over a region of interest. Researches about spaceborne video SAR were limited. Most of current researches about video SAR only focus on aircraft platform. A spaceborne video SAR system was developed with the transmitter on geostationary satellites and the receiver on the low earth orbit （LEO） satellites. The relationship between the imaging performance and the main system parameters has been studied. Then an image formation algorithm was presented, which could satisfy the imaging quality of video SAR in high squint mode and avoid unnecessary duplication of processing. The Doppler smear and offset of the moving targets were reflected by the processed images. Meanwhile, the stationary targets can be finely focused on.

关 键 词：天基视频合成孔径雷达 双站 回波模型 成像算法 大斜视角 数据重叠 

分 类 号：TN957[电子电信—信号与信息处理]