摘要
高分七号卫星于2019年11月在太原顺利发射,是中国首颗亚米级高分辨率立体测绘卫星。星上采用国内首套星图融合星敏传感器,双星敏夹角动态修正,可大幅度提高卫星姿态确定精度,同时给卫星地面系统建设带来了新的机遇和挑战。本文根据高分七号卫星的总体设计,分析高分七号双线阵相机几何处理的关键技术,并对高分七号卫星前视后视精度以及立体精度进行几何验证。结果表明,高分七号双线阵相机的前后视几何检校精度优于0.28个像素,相机的无控定位精度可以控制在6 m左右;在引入少量地面控制点进行刚性平移后,平面几何残差在1.4 m左右,高程残差在0.86 m左右。总体而言,高分七号卫星双线阵相机几何精度相较于高分系列其他卫星有了明显的提高,为后续卫星几何方面的处理具有重要意义。
GF-7 was successfully launched in Taiyuan in November 2019 and is the first sub-meter high-resolution stereo mapping satellite of China.The first domestic star map fusion star sensor is used on the satellite,with dynamic correction of the angle between the two star sensors,which can greatly improve the accuracy of satellite attitude determination.Based on the overall design of the GF-7 satellite,this paper studies the key geometric processing techniques in the processing of the GF-7 satellite to achieve high-precision positioning of the High Resolution 7 dual line array camera,and verifies the satellite’s geometric level through extensive verifications.Based on attitude measurement data and orbit measurement data,the GF-7 satellite has greatly improved its attitude and orbit determination accuracy by using star map fusion star sensors.And the GF-7 satellite has added a unified time system and a unified attitude orbit model,constructing a rigorous geometric model with multiple platforms and cameras.To address the issue of changes in payload pointing angle during the imaging process of the GF-7 satellite,it is not only necessary to ac‐curately calibrate the geometric distortion curve of the on-orbit camera,but also to obtain the precise light pointing of each CCD imaging detector in the payload to create a high-precision standard image,providing precise internal orientation geometric elements for the production of high-precision standard image products to ensure the internal geometric accuracy of satellite image products.The accuracy of geometric positioning and stereographic mapping products of GF-7 satellite is verified by high precision basic data and field ground measurement points.The high-precision basic data uses the DOM image with a geometric accuracy of better than 1:2000 and the DEM data with a high accuracy of grid and earth accuracy better than 5 m,and the field ground measurement points use 71 ground control points evenly distributed on the image.The verification results show that the uncontrolled
作者
李对对
隋正伟
龙小祥
李庆鹏
乔志远
钟慧敏
王小燕
LI Duidui;SUI Zhengwei;LONG Xiaoxiang;LI Qingpeng;QIAO Zhiyuan;ZHONG Huimin;WANG Xiaoyan(China Resources Satellite Application Center,Beijing 100094,China;China Siwei Surveying and Mapping Technology Co.,Ltd.,Beijing 100048,China)
出处
《遥感学报》
EI
CSCD
北大核心
2024年第3期756-766,共11页
NATIONAL REMOTE SENSING BULLETIN
基金
国家重点研发计划(编号:2018YFA0605500,2016YFB0501402)。
关键词
高分七号
立体测绘卫星
几何检校
严密几何模型
姿轨数据处理
星敏传感器
无控定位精度
高程残差
控制点
GF-7 Satellite
stereo mapping satellite
geometric check
rigorous geometric model
attitude track data processing
star sensors
uncontrolled positioning accuracy
elevation residual
control points
