基于机载毫米波InSAR数据生产DSM及DOM试验研究

Experiment research on DSM and DOM production based on millimeter wave InSAR

针对地形复杂、常年多云雨雾的地区,以及戈壁滩等其它一些困难地区基础测绘数据获取难的问题,本文提出了利用毫米波干涉合成孔径雷达(InSAR)的方法。该方法利用合成孔径雷达技术,通过发射宽带信号获得距离向高分辨率成像;根据雷达和目标之间的相对运动,形成方位向高分辨率成像,从而实现对目标原始回波的“距离-方位”二维高分辨率成像。试验结果表明,利用机载毫米波InSAR技术生产的数字正射影像(DOM)和数字表面模型(DSM),中误差分别为1.482 m和1.405 m,能够满足丘陵地区1∶5 000比例尺的DOM和DSM的精度要求。

This paper proposes the method of millimeter wave Interferometric Synthetic Aperture Radar(InSAR)to address the difficulties in obtaining basic surveying and mapping data in areas with com‐plex terrain,cloudy and foggy all year round,as well as some difficult Gobi Desert.This method uses synthetic aperture radar technology to obtain high resolution in the range direction by transmitting broadband signals,and the relative motion between the radar and the target forms high resolution in the azimuth direction,thereby to achieve 2D high-resolution imaging of the original target echo in the range azimuth direction.The experimental results show that the root mean square error of the digital or‐thophoto map(DOM)and digital surface model(DSM)produced by airborne millimeter wave InSAR are 1.482 m and 1.405 m respectively,meeting the accuracy requirements of 1∶5000 scale DOM and DSM in hilly areas.