基于严格解析谱的同轨双基SAR的CS成像算法  

Chirp-scaling imaging algorithm for bistatic SAR in tandem mode using exact analytical spectrum

作　　者：陈士超[1] 周鹏[1] 何伟[1] 邢孟道[1] 保铮[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《系统工程与电子技术》2012年第7期1355-1359,共5页Systems Engineering and Electronics

基　　金：国家自然科学基金重大项目(60890072);"十二五"预研项目(51307030102)资助课题

摘　　要：针对双基地合成孔径雷达(synthetic aperture radar,SAR)包络徙动的空变问题,提出一种同轨等速双基构形下基于几何关系公式方法推导出的严格解析双基频谱的线频调变标(chirp scaling,CS)成像算法,不同于波数域的成像算法,整个成像过程不需要进行插值运算,在频域聚焦实现快速成像。高精度的双基频谱使得其对基线的长短不再敏感,可以进行长基线情形下的数据处理。仿真实验验证了本文算法的有效性。Focusing on the problem of the space variation for the envelope migration in bistatic SAR, a bi- static chirp scaling （CS） algorithm is proposed based on an exact analytical bistatic point target spectrum, which is obtained by a geometry-based formula （GBF） method in tandem mode. Unlike the imaging algorithms applied in the wavenumber domain, no interpolation operation is used during the whole imaging, the focusing process is implemented in the frequency domain with celerity. The proposed algorithm can handle the bistatic tandem case with large baseline to ratio due to the high precision of the spectrum. Simulation experiments validate the effec- tiveness of the proposed method.

关 键 词：双基合成孔径雷达 严格解析谱 线频调变标算法 

分 类 号：TN957.52[电子电信—信号与信息处理]