摘要
地球同步轨道卫星会受在轨环境影响而产生热变形,进而影响载荷的对地指向精度,由于空间环境的不确定性和热变形的非线性,在轨的热变形难以量化。文章研究了应用真实在轨遥测数据分析卫星星体热变形的规律,将热变形视作日周期项与年周期项的组合,建立了傅里叶级数形式的数学模型,并利用最小二乘法提出了星体热变形参数的估计方法。对两颗卫星的星体热变形进行了估计和补偿仿真,参数估计结果一致性好,表明了建模的合理性与补偿的可行性。热变形日周期项得到了很好的补偿,其峰峰值降低了80%,年周期项的峰峰值部分降低达80%,但整体上不如日周期项。
Geosynchronous orbit satellites are subject to thermal deformation due the orbital environment,which is in turn affects the pointing accuracy of the payload.Quantifying the thermal deformation is difficult since uncertain and nonlinear effort of the environment.In this paper,body thermal deformation of satellite is analyzed based on the real in-orbit telemetry measurement data.The deformation is consider as a combination of daily deformation and annual period deformation,and a model is established by using fourier series,in addition the way to estimate the parameters of body thermal deformation is given.Body thermal deformation of two satellites is estimated and compensated within simulation,which shows coherence of the estimation,validity of the modeling and feasibility of the compensation method.Peak-to-peak value of daily deformation is reduced by 80%,while the annual period deformation reduced by 80%partly,achieving less benefit than the daily part generally.
作者
王海强
吕红剑
李新刚
裴胜伟
WANG Haiqiang;LYU Hongjian;LI Xingang;PEI Shengwei(Institute of Telecommunication Satellite,China Academy of Space Technology,Beijing 100094,China)
出处
《航天器工程》
CSCD
北大核心
2019年第5期81-88,共8页
Spacecraft Engineering
关键词
热变形
星敏感器
指向精度
误差补偿
在轨数据
thermal deformation
star sensor
pointing accuracy
error compensation
telemetry measurement data
