ZY-3卫星异轨立体影像几何定位精度分析  

Geo-positioning Accuracy Analysis of ZY-3 Cross-track Stereo-images

作　　者：胡芬[1,2] 杨博[3,4] 唐新明[1,2] 高小明[1,2] 

机构地区：[1]国家测绘地理信息局卫星测绘应用中心,北京100048 [2]卫星测绘技术与应用国家测绘地理信息局重点实验室,北京100048 [3]武汉大学计算机学院,武汉430079 [4]武汉大学地球空间信息技术协同创新中心,武汉430079

出　　处：《航天返回与遥感》2016年第1期71-79,共9页Spacecraft Recovery & Remote Sensing

基　　金：测绘地理信息公益性行业科研专项(201412007);2015年基础测绘科技项目(A1501-3)

摘　　要：文章选取"资源三号"(ZY-3)卫星在两个轨道上分别侧摆10°和–10.6°获取的山东同一地区全色正视相机影像,构成连续覆盖4景区域的异轨立体影像。以区域内均匀分布的35个高精度外业GPS点作为控制数据来源,进行影像平差定向和几何定位精度统计。实验结果表明,在基高比为0.36左右的非理想条件下,无控制点的平面误差和高程误差均值分别为1.5m和85m,中误差分别为2.3m和4.0m,高程精度明显低于平面精度;基于少量控制点对系统误差改正效果明显,在单控制点条件下的平面误差和高程误差均值分别为2.4m和1.7m,中误差分别为1.4m和4.0m,完全满足1∶5万比例尺精度要求。文章的研究内容对于国产光学卫星异轨立体影像获取效能的发挥能起到一定的参考作用。In this paper, four continuous scenes of nadir panchromatic images covering a certain district of Shandong Province in China are captured twice from two orbits and then are chosen to form four pairs of cross-track stereo-images, with 10 and-10.6 degrees side-looking angles separately. Thirty-five accurate and evenly-distributed GPS points collected in field are used as GCPs, the image points of which are measured ac- curately on the images, and the geo-positioning accuracy of these cross-track stereo-images is analyzed. It is demonstrated by the experimental results that when the B/Ht ratio is 0.36 which is not ideal, the horizontal and vertical systematic error without GCPs are 1.Sm and 85m, and the RMS error are 2.3m and 4m, separately, in which the horizontal accuracy is much better than that in the vertical direction. With only a few GCPs, the sys- tematic error can be obviously compensated, that is, with only one GCP the mean error values are reduced to 2.4m and 1.7m in horizontal and vertical directions, with the RMS error at the 1.4m and 4m level, respectively.Overall, the 1： 50000 scale mapping requirement can be thoroughly reached. This research to a certain degree gives reference to the effectiveness exertion of cross-track stereo-images acquisition of domestic optical satellites.

关 键 词：异轨立体影像 区域网平差 几何定位精度分析 “资源三号”卫星 

分 类 号：P237[天文地球—摄影测量与遥感]