基于等效平行轨迹距离模型的双基CS成像算法  

Chirp Scaling Algorithm for Bistatic SAR Based on Parallel-track Range Model

作　　者：杨科锋[1] 梁甸农[1] 何峰[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《信号处理》2009年第2期228-232,共5页Journal of Signal Processing

摘　　要：本文基于双基SAR等效平行轨迹距离模型及由该模型得到的二维波数域表达式,通过对此表达式的分析变换,将二维波数域表达式的相位表示为发收距离和与波数函数相乘的形式,基于此,结合单基SAR的CS成像算法思想,推导提出了基于平行轨迹距离模型的双基CS成像算法。本算法在距离多普勒域进行变标操作,将各距离单元的包络徙动校正得和参考距离单元一致,然后在二维波数域通过简单的相位相乘完成徙动校正,很好地解决了双基SAR的包络徙动及其空变问题,且避免了插值运算,与波数域算法相比,效率更高。最后采用该算法对仿真的点目标双基回波进行成像处理,结果与等效单基CS算法相比较,证明了本文算法的有效性和优越性。The chirp scaling algorithm is presented for bistatic SAR, based on a parallel-track range model and corresponding Doppler wavenumber domain formulation of echoes. By chirp scaling in rang-Doppler, the migration of targets in different rang cell is cor- rected equal to the migration of reference range cell. Then the range migration is compensated by phase multiplying in 2D-wavenumber domain. Compared with RMA ,the algorithm is efficient and precise in processing rang cell migration correction without interpolation. The quality of images of simulated bistatic echoes focused by the algorithm is much better than CS algorithm based on the single-line effective rang model.

关 键 词：双基SAR 等效平行轨迹距离模型 变标操作 CS成像算法 

分 类 号：TN957[电子电信—信号与信息处理]