DGPS／IMU在机载InSAR系统中的应用

The Application of DGPS/IMU in Airborne InSAR System

InSAR系统是一个距离投影的行成像系统，方位向各行的方位元素各不相同，在测图过程中需要高精度的DGPS／IMU进行雷达天线位置、速度及姿态测量。本文依据雷达工作、SAR成像和InSAR基本原理，研究了DGPS／IMU在机载InSAR系统中应用，主要包括载机姿态的变化补偿、InSAR成像的运动补偿、平地效应消除及基于DGPS／IMU的DEM生成等四个方面，并对这四方面的应用进行了介绍。

InSAR system is a column imaging system of distance projection, in which the orientation elements of each orientation to each line are different. So in the mapping process, it is necessary to use high - precision DGPS/ IMU to survey the radar antenna＇ s position, velocity and attitude. In this paper, according to the radar working, SAR imaging and InSAR basic principles, the application of DGPS/IMU in airborne InSAR system was studied, including four aspects such as the changing compensation of carrier aircraft attitude, the motion compensation of InSAR imaging, the elimination of ground effect, and the DEM generation based on the DGPS/IMU. Finally, the four aspects＂ concrete applications were introduced.