【作者】 李元昊； 李晓锐； 胡程； 曾涛；

【Author】 Yuanhao Li;Xiaorui Li;Cheng Hu;Tao Zeng;School of Information and Electronics,Beijing Institute of Technology;

【机构】 北京理工大学信息与电子学院；

【摘要】 地球同步轨道合成孔径雷达(GEOSAR)是新体制雷达的一个重要发展方向,其由于测绘带宽、覆盖性能好等优点而受到各国研究人员的广泛关注。本文主要研究基于GEOSAR系统的差分干涉测量技术。文章从差分干涉测量(二轨法)数据处理的角度对GEOSAR差分干涉测量的性能进行了分析和仿真,为设计满足客户需求的系统指标提供了理论依据。基于差分干涉测量二轨法数据处理的步骤,文章得出了地表形变测量精度受干涉相位误差、外部DEM误差和轨道定轨误差影响的结论,并针对每个误差源所引入的形变测量误差进行了理论分析和仿真。分析结果表明:GEOSAR差分干涉测量可以监测地表的微小形变,且形变测量精度受垂直基线长度的影响;在20mm形变测量精度要求下,GEOSAR卫星定轨精度需优于1.7米,且垂直基线长度越长,定轨精度需求越高。更多还原

【Abstract】 Geosynchronous synthetic aperture radar is an important embranchment of radar development. Its wide swath and advantages in coverage characteristics draw more and more scientists’ attentions. This paper is mainly about some researches on differential interferometric technology of GEOSAR. Based on the data processing method of differential interferometric(two-pass), this paper analysis and simulate the performance of GEO D-In SAR, provide a basis for the design of GEO D-In SAR system which matching the users’ accuracy requirements. Based on the analysis of the process of two-pass method, the paper comes to a conclusion that the accuracy of deformation measurement is influenced by the error of interferometric phase, the error of the DEM and the error of orbit determination. The paper gives theoretical analysis and simulation for each one of the three factors. The result shows: the GEO D-In SAR can detect the tiny deformation of the surface; the accuracy of the measurement is influenced by the length of the perpendicular baseline; when the need of the accuracy of deformation measurement is 20 mm, the accuracy of orbit determination should be better than 1.7 m, and the longer the length of the perpendicular baseline, the higher the accuracy of orbit determination needed.更多还原