基于严格解析谱的同轨双基SAR的CS成像算法

摘要

Focusing on the problem of the space variation for the envelope migration in bistatic SAR,a bistatic 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 effectiveness of the proposed method.%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.