机载双天线干涉SAR非线性近似自配准成像算法

Auto-registration Imaging Algorithm of Non-linear Approximation for Airborne Dual-antenna InSAR

为了提高机载双天线干涉SAR系统的干涉处理速度而又不损失配准精度,该文提出了非线性距离向ECS自配准成像算法。该算法通过对两天线视角不同引起的路径差的非线性近似,在成像处理阶段实现了干涉图像对在距离向的高精度自配准。该算法在产生干涉相位时较传统算法在保持较高配准精度的情况下显著提高了运算速度。本文通过对仿真数据、实际数据的处理以及系统参数对算法配准精度影响的仿真分析,证明了该算法的有效性。

In order to improve the speed of interferometric processing for the airborne dual-antenna interferometric Synthetic Aperture Radar （SAR） system and also remain the accuracy of the registration,the non-linear approximation in the range Extended Chirp Scaling （ECS） auto-registration imaging algorithm is presented in the paper. This algorithm realizes the accurate auto-registration in the range in course of the imaging processing by the non-linear approximation to the path difference caused by the different visual angles of the two antennas. It increases the speed of generating the interferometric phase largely and preserves the higher accuracy of the registration meanwhile. Through the processing of the simulation data and the real interferometric data and the analysis of the impact of the systemic parameters on the accuracy of registration,the validity of the algorithm presented in the paper is proved.