同空间后向投影InSAR成像及干涉相位提取方法

为了提高复杂运动情况干涉合成孔径雷达（InSAR）成像精度，结合时域后向投影方法提出了一种基于同空间后向投影的InSAR成像与相位提取方法，分析后向投影多普勒补偿函数与干涉相位的关系，通过各天线回波投影到相同的成像空间，再构造相位补偿函数进行相干积累成像。仿真和实测数据验证了复杂运动情况下本文方法较传统频域算法获得更好的InSAR成像和干涉相位质量，且该方法还可在成像过程中实现InSAR图像配准、去平地效应的一体化处理，简化了InSAR数据处理。

InSAR Imaging and Interferogram Extraction Based the Same Space Back Projection

To improve interferometric synthetic aperture radar (InSAR) imaging accuracy in the case of complex motion, a time-domain imaging method is exploited in this paper, and a novel algorithm based on echo projecting to the same space is proposed for InSAR imaging and interferogram extraction. The relationship between the backward projection Doppler phase compensation function and the interferogram is also analyzed. In this theme, the echoes of the different antennas are projected into the same imaging space, and then InSAR images are obtained by using the coherent echoes integration with a modified Doppler phase compensation function. The simulated and the experimental airborne InSAR results demonstrate that the proposed algorithm can improve the quality of InSAR imaging and interferogram compared with the conventional frequency-domain method. In addition, our algorithm can achieve both image registration and earth-flat effect removed during one procedure, which greatly simplifies the procedure of InSAR post-processing.