光学精密工程2018，Vol.26Issue(4)：796-806,11.DOI:10.3788/OPE.20182604.0796
近地卫星陨落期地球反照系数估计
Estimation of albedo coefficient of Earth during LEO satellite falling
摘要
Abstract
In order to estimate the albedo coefficient of the Earth,one needs to investigate the change in solar array output current of a low Earth orbit(LEO)satellite caused by the sunlight reflected from the Earth while the satellite is falling to the ground.An LEO satellite orbiting along a sun-synchro-nous orbit at an altitude of 300 km with a local time of descending node(LTDN)of 10:30 A.M.is se-lected as the sample.Details of the semi-major axis degradation,inclination perturbance,solar inci-dence variation,and LTDN shift are discussed,and the solar array output current and temperature are analyzed.Based on the sinusoidal fitting of the solar array output current data,a method for estima-ting the albedo coefficient of the Earth is developed.T he results,validated by telemetry,indicate that when the satellite falls from an altitude of 300 km to 100 km,the albedo coefficient of the Earth in-creases gradually from 0.21 to 0.40,and then decreases to approximately 0.20.Parabolic fitting of the estimated results indicate that for orbits at altitudes in the range 210-270 km,the albedo coeffi-cient of the Earth results in an enhanced solar array output current,with the maximum occurring for an orbit at an altitude of approximately 250 km w hen the albedo coefficient of the Earth is approxi-mately 0.28.The results will be helpful for telemetry diagnosis,energy estimation and prediction, and device state of health evaluation for long-term management of satellites for tracking,telemetry, and command,and visible light payload applications.关键词
近地卫星/地球反照/最小二乘估计/太阳电池阵电流/卫星遥测Key words
low earth orbit satellite/earth albedo/least square estimation/solar array current/satel-lite telemetry分类
航空航天引用本文复制引用
李强,张烨,田凯,祝俊淞,段崇雯..近地卫星陨落期地球反照系数估计[J].光学精密工程,2018,26(4):796-806,11.基金项目
青年科学基金资助项目(No.61401515) （No.61401515）
