资源三号测绘卫星三线阵成像几何模型构建与精度初步验证

摘要

根据资源三号测绘卫星的总体设计,分析资源三号卫星高精度几何处理的关键问题,结合资源三号测绘卫星几何特性,提出基于虚拟CCD线阵成像技术的资源三号测绘卫星成像几何模型。利用资源三号卫星第一轨影像大连地区数据,完成前视、正视、后视的传感器校正产品的生产试验,不同控制点情况下进行平差试验,初步生产该地区的数字表面模型（DSM）和数字正射影像（DOM）,精度验证结果表明在试验区四角布设控制点的情况下DOM平面精度优于3m,DSM高程精度优于2m。与国外相近分辨率的卫星相比,资源三号测绘卫星可以达到较高的几何精度。%The Ziyuan-3（ZY-3） surveying satellite is the first civilian high-resolution stereo mapping satellite of China.Its objective is oriented to plot the 1∶50 000 and 1∶25 000 topographic maps.Comparing with foreign commercial mapping satellite imagery,the establishment of our own imaging geometry model is the core technical problem for different products and various applications of ZY-3 surveying satellite.This paper analyses the key problem on precision geometry processing based on the overall design,and proposes the ZY-3 surveying satellite imaging geometry model with the technology of virtual CCD line-array imaging.In addition,this paper utilizes the first orbit imagery of ZY-3 satellite with coverage of the region of Dalian,and produces forward,backward and nadir cameras calibration products.Different ground control points are selected for the block adjustment experiment,and the digital surface model（DSM）,digital ortho map（DOM） are generated.The accuracy is validated by check points.It can be seen from the experiment that the planar and vertical accuracy are better than 3 meters and 2 meters,respectively.The experiment demonstrates the effectiveness of ZY-3 surveying satellite imaging geometry model.