摘要
在建立基于恒星观测的成像仪指向偏差在轨修正模型的基础上,提出了模型中若干关键参数(包括最低观测星等、待观测恒星及成像仪凝视观测位置等)的选取方法。同时,开展了数字延迟积分技术、系统点源扩展函数等对指向偏差测量精度的影响分析,提出了指向偏差确定精度达1″的在轨修正方案,并利用GOES-9卫星成像仪实际恒星观测数据进行了部分定量验证。研究成果将为后续风云四号卫星成像仪高精度指向偏差在轨修正的业务模式设计和工程实施,提供重要的技术参考。
Based on the on-orbit modification model of pointing error for geostationary imager, several important parameters, including lowest star brightness level, stars and spatial positions for staring observation, are figured out. Moreover, the influences of digital delay integration （DDI） and point spread function （PSF） on the accuracy of the estimated pointing error are analyzed and a feasible scheme with pointing error as accurate as 1″ is also established. Real star sensing observations from GOES-9 imager are used to validate partial characteristics of this model quantitatively. This method will benefit the operational modes design and engineering application of high accuracy onorbit modification of pointing error for imager in the following up Fenyun-4 satellite.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2009年第9期2413-2420,共8页
Acta Optica Sinica
基金
国家自然科学基金(40401040)
气象行业专项(GYHY(QX)2007-6-9)课题资助
关键词
成像系统
指向偏差
恒星观测
在轨修正
静止轨道卫星
imaging systems
pointing error
star sensing
on-orbit modification
geostationary satellite
