基于姿态误差时空补偿的高分五号02星全谱段影像定位精度提升方法  

Positioning Accuracy Improvement of GF-5B VIMS Images Based on Attitude Error Spatiotemporal Compensation

作　　者：王艳丽[1] 王密[2] 董志鹏 范城城 Wang Yanli;Wang Mi;Dong Zhipeng;Fan Chengcheng(College of Geodesy and Geomatics,Shandong University of Science and Technology,Qingdao 266590,Shandong,China;State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430079,Hubei,China;First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,Shandong,China;Innovation Academy for Microsatellites of Chinese Academy of Sciences,Shanghai 201210,China;Shanghai Engineering Center for Microsatellites,Shanghai 201210,China)

机构地区：[1]山东科技大学测绘与空间信息学院,山东青岛266590 [2]武汉大学测绘遥感信息工程国家重点实验室,湖北武汉430079 [3]自然资源部第一海洋研究所,山东青岛266061 [4]中国科学院微小卫星创新研究院,上海201210 [5]上海微小卫星工程中心,上海201210

出　　处：《光学学报》2024年第12期329-341,共13页Acta Optica Sinica

基　　金：国家自然科学基金(42001408);山东省自然科学基金(ZR2022QD104,ZR2023QD113);武汉大学测绘遥感信息工程国家重点实验室开放基金(22E01)。

摘　　要：提出一种顾及姿态误差时空变化的全谱段光谱成像仪(VIMS)定位精度提升方法。通过分析高分五号02星(GF-5B卫星)181 d的星敏感器低频误差规律,以分段傅里叶级数模型为基础,利用时序化、多空间补偿策略,统一了非基准与基准定姿模式之间的低频误差特性,补偿低频误差对影像几何定位的影响。研究结果表明,所提方法将VIMS可见光近红外影像无地面控制几何定位精度从4.274 pixel优化至1.867 pixel,且对不同时相、不同区域的光学影像均有良好的精度提升效果。Objective The GaoFen-5B(GF-5B)satellite launched on September 7,2021 can achieve comprehensive atmosphere and land observation.The visual and infrared multispectral sensor(VIMS)of the GF-5B satellite can obtain imagery data in 12 spectral bands from visible light to long wavelength infrared.With the advantages of a high signal-to-noise ratio and the ability of day and night observation,the imagery of visual and infrared multispectral sensors is widely applied to land degradation monitoring,crop growth analysis,and thermal pollution detection.GF-5B is equipped with three star sensors as the attitude measurement system to achieve high-precision attitude determination and geometric positioning.Among these star sensors,star sensors 2 and 3 have better measurement accuracy and stability performance and are often employed as conventional attitude determination modes to calculate satellite attitude parameters.However,owing to factors such as sunlight exposure and insufficient star number,there are only star sensors 1 and 2 or star sensors 1 and 3 working simultaneously to determine the satellite attitude parameters,which are named unconventional attitude determination modes.Due to the spatial thermal environment changes of satellites,the body structure and installation structure of the attitude measurement load undergo thermoelastic deformation,which causes attitude low frequency error related to the satellite orbit period.This seriously affects the consistency of attitude determination results between conventional and unconventional attitude determination modes and the stability of the geometric positioning accuracy of the image without ground control points.Therefore,we propose an improvement method of geometric positioning accuracy for visual and infrared multispectral imagery based on spatiotemporal compensation of attitude low frequency error.Methods Based on the optical axis angle of star sensors,the spatiotemporal characteristics of low frequency error of star sensors are analyzed in 181 d for the GF-5B satellite

关 键 词：遥感 姿态低频误差 几何定位精度 高分五号02星 全谱段光谱成像仪 

分 类 号：P236[天文地球—摄影测量与遥感]