高分多模卫星图像质量保证和验证  

Image Quality Assurance and Verification of GFDM-1 Satellite

作　　者：余婧 李雨廷 王跃[1] 张国斌[1] 杨文涛[1] 程侃 王小燕[2] 钟慧敏[2] YU Jing;LI Yuting;WANG Yue;ZHANG Guobin;YANG Wentao;CHENG Kan;WANG Xiaoyan;ZHONG Huimin(Institute of Remote Sensing Satellite,China Academy of Space Technology,Beijing 100094,China;China Centre for Resources Satellite Data and Application,Beijing 100094,China)

机构地区：[1]中国空间技术研究院遥感卫星总体部,北京100094 [2]中国资源卫星应用中心,北京100094

出　　处：《航天器工程》2021年第3期86-93,共8页Spacecraft Engineering

基　　金：国家重大科技专项工程。

摘　　要：针对高分多模卫星敏捷成像模式开展图像质量预估,识别出关键影响因素,并在工程设计和研制过程中采取相应措施保证图像质量。通过适当提升星下点分辨率,保证卫星一定机动范围内的0.5 m分辨率;配置大气同步校正仪,消除大气对高分辨率图像的影响;采用积分时间分片设置,解决卫星大角度成像时中心和边缘视场像移速度差异大的问题;采用积分时间实时设置,解决主动推扫成像过程中焦面像移速度变化快的问题;通过地面处理,解决主动推扫成像模式下图像内部均一化的问题。高分多模卫星在轨测试结果表明:研制过程中采用的图像质量保证措施有效,敏捷成像模式下的图像质量符合预期要求。In this paper,the image quality estimation is carried out for the agile imaging modes of GFDM-1 satellite,the key influencing factors are identified,and corresponding measures are taken to ensure the image quality during the engineering design and development process.The resolution of the sub-satellite points is improved to ensure the 0.5m resolution within a certain maneuvering range.A synchronization monitoring atmosphere corrector is added to solve the influence of the atmosphere on high resolution images.Integral time is set separately on different CCD chips to solve the problem of the large difference of image movement speed between the center and the edge of the field of view when the satellite is imaging at a large angle.The real-time setting of integral time is used to solve the problem of high dynamic image movement speed on the focal plane under active-scan.Certain ground process is used to solve the problem of uniformity of indicators such as the resolution in an active-scan image.Agile imaging is tested and verified on orbit,and the results show that the applied image quality assurance measures are effective.The image quality of the satellite in agile imaging mode meets the expected requirements.

关 键 词：高分多模卫星 图像质量 主动推扫成像 

分 类 号：V443.5[航空宇航科学与技术—飞行器设计]