基于DGPS/IMU的机载InSAR系统DEM生成技术

Technique of DEM Generation from Airborne InSAR System Based on DGPS/IMU

InSAR技术是近年来在SAR基础上发展起来的一种新技术,机载InSAR系统在国外已得到广泛应用。根据InSAR测量原理,在系统中需装有高精度的DGPS/IMU系统,测量雷达天线位置和基线倾角,用于求解地面目标点高程,但如何求解目标点平面坐标研究不多。在介绍了InSAR高程求解的基础上,结合SAR成像原理,使用高精度DGPS/IMU系统获取的数据,提出了平面坐标的求解方法,并使用实际的机载InSAR数据进行了试验。结果表明,利用提出的方法可以满足其精度要求。

The InSAR technology is a new technology which has recently been developed from the SAR, the airborne InSAR system has already been applied overseas widely. According to InSAR measurement principles, in order to solve the elevation of ground destination points, a high-precision DGPS/IMU system used to get the data of antenna position and base line tilt angle should be installed. But the researches on how to solving the area coordinates of destination points are few. After introducting the basis of InSAR elevation solving basis, combining the SAR imaging principles, and using the data gained from the high-precision DGPS/IMU system, a area coordinates solving method has been proposed. Then, several tests with actual airborne InSAR data has been taken. The conclusions indicate that the accuracy requirements can be satisfied by this method.