基于有理多项式模型的高分四号卫星可见光通道面阵成像载荷在轨几何定标  

On-Orbit Geometric Calibration of Panchromatic Planar Array Sensor on GF4 Satellite Based on the Rational Polynomial Coefficient Model

作　　者：皮英冬 王密[1] 王思恒 赵会杰 赵亮 Pi Yingdong;Wang Mi;Wang Siheng;Zhao Huijie;Zhao Liang(State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430072,Hubei,China;School of Resource and Environmental Sciences,Wuhan University,Wuhan 430079,Hubei,China;China Academy of Space Technology,Beijing 100094,China)

机构地区：[1]武汉大学测绘遥感信息工程国家重点实验室,湖北武汉430072 [2]武汉大学资源与环境科学学院,湖北武汉430079 [3]中国空间技术研究院,北京100094

出　　处：《光学学报》2023年第12期313-321,共9页Acta Optica Sinica

基　　金：国家自然科学基金(42192583);中国博士后科学基金(2022M722444);中央高校基本科研业务费专项(2042022kf1002);中国空间技术研究院CAST创新基金。

摘　　要：针对我国首颗静止轨道高分辨率光学遥感卫星高分四号(GF4)的可见光通道面阵成像载荷,基于成像模型中内外方位元素的相关特性,提出一种基于先验有理多项式(RPC)模型的在轨几何定标方法,以地面控制点的真实像点和基于RPC模型计算的虚拟像点为观测值,在初始的定标参数基础下重建精确的几何定标参数,实现卫星成像载荷系统性几何误差的补偿。本方法完全避免了传统在轨几何定标构建严格几何成像模型中复杂的辅助数据处理和多个成像坐标系统的转换,建模和解算均极为简单,且定标结果可直接应用于基于严格几何成像模型的地面处理系统。通过一组GF4卫星面阵载荷的真实影像数据实验验证了本方法的有效性和模型的合理性,结果表明:本方法可有效补偿成像模型中的系统几何误差,且得到定标结果与基于严格几何成像模型的传统定标方法几乎一致。Objective Gaofen4(GF4)is China's first highresolution geostationary optical satellite equipped with planar array,which is employed for remote sensing monitoring of China and its surrounding areas.The panchromatic planar array sensor on this satellite collects images with a complementary metal oxide semiconductor(CMOS)of 10240×10240 detectors.It can perform timesharing imaging on five spectral bands through rotating filters and simultaneously obtain panchromatic and multispectral images with a spatial resolution of 50 m.Essential in data processing of GF4,onorbit geometric calibration should be performed to correct the systematic geometric errors in its imaging models and ensure the geometric quality of its images.At present,onorbit geometric calibration is also usually performed based on such an imaging model to fit the rigorous geometric imaging model adopted in the processing system of remote sensing satellites.However,although the onorbit geometric calibration is only a simple resection in photogrammetry,the satellite is a complex imaging and measuring system integrating attitude,orbit,and time observations.The building of its rigorous imaging model involves complex processing for auxiliary data such as attitude,orbit and time and ephemeris data,as well as transformations among multiple coordinate systems.Additionally,each calibration task requires separate production of these auxiliary data in the daily operational data processing system.Therefore,the geometric calibration based on the rigorous imaging model is not only complicated in modeling but also timeconsuming and laborious.Thus,this paper proposes an onorbit geometric calibration based on the unified rational polynomial coefficient(RPC)model for the panchromatic planar array sensor on the GF4 satellite.Methods This paper proposes a simple onorbit geometric calibration method based on a priori RPC model,in which the calibration is performed on the current calibration parameters and the RPC generates based on these calibration parameters.The essence is

关 键 词：几何光学 面阵载荷 在轨几何定标 有理多项式模型 系统几何误差 

分 类 号：P230[天文地球—摄影测量与遥感]