基于高分辨率合成孔径雷达影像的角反射器绝对定位

Absolute Geolocation of Corner Reflectors Using High-Resolution Synthetic Aperture Radar Images

摘要:

详细介绍了合成孔径雷达（SAR）影像大地测量的定位公式和解算流程，利用加权质心法实现了SAR影像中点目标精细定位。针对同轨SAR影像因空间基线过短造成的定位精度和稳定性差问题，提出了一种添加高程限制条件的解决方法。采用数景高分辨率TerraSAR-X和Sentinel-1 SAR影像，对布设于武汉和上海的6个角反射器分别进行了绝对定位实验。结果表明，利用TerraSAR-X影像获得的角反射器内符合定位精度可达到厘米级，利用Sentinel-1影像获得的角反射器内符合定位精度可达到分米级。

Abstract:

This paper introduced the geolocation equations and solution procedures of synthetic aperture radar （SAR） imaging geodesy in details， and conducted precise positioning of point targets in SAR images based on the weigh-centroid method. Regarding to the poor geolocation accuracy and solution stability caused by very short spatial baselines with single track SAR images， a height constraint was added to the geolocation model. By adopting multiple high-resolution TerraSAR-X and Sentinel-1 SAR images， the absolute geolocation was implemented to six corner reflectors（CRs） located at Wuhan and Shanghai， respectively. The experiments demonstrate that the absolute geolocation accuracy of CRs at centimeter-level can be achieved by using TerraSAR-X SAR images， and decimeter-level positioning accuracy by using Sentinel-1 SAR images.