星载立体SAR定位精度分析  

Analysis of the Positioning Accuracy of Spaceborne Stereo SAR

作　　者：陈刚[1,2] 钱方明 张笑微[1,2] 张昊 CHEN Gang;QIAN Fangming;ZHANG Xiaowei;ZHANG Hao(Xi’an Research Institute of Surveying and Mapping,Xi’an 710054,China;State Key Laboratory of Spatial Datum,Xi’an 710054,China)

机构地区：[1]西安测绘研究所,西安710054 [2]空间基准全国重点实验室,西安710054

出　　处：《航天技术与工程学报》2025年第1期86-92,共7页

摘　　要：目前立体SAR定位精度分析研究较少且缺少真实数据进行验证。针对当前研究中存在的不足,系统性开展了星载立体SAR定位精度分析。首先给出了星载立体SAR定位精度模型、绝对高程和平面精度公式,分析了影响绝对高程和平面精度的误差传递链路和误差源,将误差源归为绝对定轨精度和斜距精度两大类;然后分析了典型情况下两类误差对于平面和高程精度的影响以及基线长度对于定位精度的影响;再利用TerraSAR-X郑州数据进行了试验,分析了TerraSAR-X数据的误差源,将其带入定位精度模型,得到理论平面和高程精度分别为0.55 m、0.31 m;最后利用18个角反射器进行了精度验证,得到实际平面和高程精度分别为0.46 m、0.26 m。理论与实际结果非常接近,说明了提出定位精度模型的合理性。At present,there are few researches on stereo SAR positioning accuracy and lack of real dat for verification.Aiming at the shortcomings of the above researches,the paper systematically analyses the spaceborne stereo SAR positioning accuracy.Firstly,the spaceborne stereo SAR positioning accuracy model,absolute elevation and horizontal accuracy formula are given,error propagation chain and error source that affect absolute elevation and plane accuracy are analysed,and error sources are classified into two categories:absolute orbit determination accuracy and slant range accuracy.The influence of the two types and baseline length on positioning accuracy under typical circumstances are analysed.Finally,eexperiments were conducted using TerraSAR-X data from Zhengzhou to analyse the error source of TerraSAR-X data and bring them into the positioning accuracy model.The theoretical plane and elevation accuracy are 0.55m and 0.31m,using 18 angle reflectors for accuracy verfication,the actual plane and elevation accuracy are 0.46m and 0.26m.The theoretical and practical results are very close,which shows the rationality of the positioning accuracy model proposed in the paper.

关 键 词：合成孔径雷达 立体合成孔径雷达 定位精度 精度分析 

分 类 号：TN9[电子电信—信息与通信工程]