合作空间目标双基地ISAR图像畸变分析及校正方法  

Image Distortion Analysis and Correction Method of Cooperative Space Target in Bistatic ISAR

作　　者：尚朝轩[1] 韩宁[1] 董健[1] 张大伟[2] 

机构地区：[1]军械工程学院雷达工程教研室,石家庄050003 [2]北京跟踪与通信研究所,北京100094

出　　处：《电讯技术》2012年第1期38-42,共5页Telecommunication Engineering

基　　金：国家高技术研究发展计划(863计划)项目(2008AA0194)~~

摘　　要：为了解决双基地逆合成孔径雷达(ISAR)二维图像的畸变问题,以平稳运动的合作空间目标为研究对象,从双基地ISAR回波模型出发,研究了图像的畸变机理并提出了基于畸变角估计的图像畸变校正方法。基于合作空间目标的精轨信息,算法首先估计出成像期间的双基地角,其次利用图像畸变角与双基地角的关系对畸变角进行估计,然后利用畸变角计算横向畸变单元数,最后对二维图像进行反向畸变补偿,完成畸变校正。仿真实验验证了算法的有效性。The two-dimensional image could be distorted in bistatic inverse synthetic aperture radar（ISAR）. To solve this problem, the distortion mechanism is studied and the correction method based on distortion angle estimation is put forward. The study object is cooperative space target with stable motion and the research starts off from the bistatic ISAR echo model. Based on the accurate orbit information, the bistatic angle is estimated first. Then the distortion angle is estimated based on the relationship between bistatic angle and distortion angle, which is used to count the number of distortion cell. Finally, the two-dimensional image is compensated to the reverse direction to finish the distortion correction. The availability of this algorithm is validated by simulation experiment.

关 键 词：双基地ISAR 二维图像 畸变校正 空间目标 精轨信息 

分 类 号：TN957.51[电子电信—信号与信息处理]