基于相位近似的双基地SAR波数域成像算法

双基地SAR系统的目标回波信号斜距历程与单基地SAR存在本质差异，因而单基地成像算法无法直接应用于双基地系统。为此该文提出对双基地SAR点目标脉冲响应函数二维频谱的相位项做一阶近似，由此推导出双基地SAR波数域成像算法。通过对点目标与面目标的成像仿真得到的成像结果及其质量评估指标表明:该算法可以在大基线长度、大斜视角的情况下实现高分辨成像。

A Wavenumber Domain Imaging Algorithm for Bistatic SAR System Based on Phase Approximation

The bistatic SAR overall slant range history of target response is essentially different from the monostatic slant range history;hence,bistatic SAR imaging processing can not be achieved by purely monostatic approaches.To address the problem,a wavenumber domain algorithm is derived,which is based on the one-order approximation of the point scatter response's two-dimensional spectrum phase.Bistatic SAR data of simulated point and surface scatter response are focused by the algorithm and the quality of the image demonstrates the effectiveness and high resolution of the algorithm in large squint angle and large base line length case.