双基地ISAR越距离单元徙动分析与校正方法  

Study on Correction Method of Bistatic ISAR Migration Through Resolution Cell for Space Target

作　　者：韩宁[1,2] 尚朝轩[2] 何强[2] 董健[2] 

机构地区：[1]机械工程学院机械技术研究所,石家庄050000 [2]军械工程学院,石家庄050003

出　　处：《火力与指挥控制》2013年第3期49-52,57,共5页Fire Control & Command Control

基　　金：国家"863"计划基金资助项目(2008AA0194)

摘　　要：空间目标双基地ISAR成像中,散射点的越距离单元徙动会造成目标像距离维的散焦,为解决此问题,研究了相应的越距离单元徙动校正方法。针对中频直接采样匹配滤波非相参双基地ISAR,以空间目标为研究对象,分析了成像期间双基地角固定不变时越距离单元徙动发生的原因,并以此为基础,借鉴单基地ISAR越距离单元徙动的校正思路,提出利用Keystone变换对目标像越距离单元徙动进行校正的方法,最后利用空间目标理想散射点模型对算法进行了仿真验证。In bistatic inverse synthetic aperture radar（ISAR） system,range-dimension of the target image is defocused by migration through resolution cell（MTRC） of target scatter.In order to solve the problem,MTRC correction method is researched.Intermediate frequency direct sampling is used in the system.Matching filter pulse compression with non-coherent bistatic ISAR imaging mechanism is adopted and space target is taken as research object.The factor causing MTRC in bistatic ISAR is analyzed in detail when bistatic angle is constant during imaging process.Then the correction method based on Keystone transformation is put forward.And the correction method is validated by space target with ideal scatters.

关 键 词：双基地逆合成孔径雷达 越距离单元徙动 KEYSTONE变换 中频直接采样 

分 类 号：TN957.51[电子电信—信号与信息处理]