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近地轨道卫星太阳电池阵功率衰减估计

     

摘要

A model of mean current was developed to estimate the output power attenuation factor of Low Earth Or-bit (LEO)satellites in different seasons and different solar activity years defined by orbit decay,and with no nor-malization to solar incidence,distance and temperature to determine the output power attenuation of solar cell ar-rays,based on analysis of the variation and influence of parameters such as semi-major axis,solar incidence and sun-to-earth distance.In Tracking,Telemetry and Command (TT&C)management,the lowest output power supplied to the whole satellite to work in health always takes place near summer solstice and it is a very important satellite energy reference.With TT&C data,the estimation has shown that when it is near summer solstice,the attenuation factor is about -0.012 and annual power attenuation is about 1.2%.The model has already been used to provide as-sistance to TT&C telemetry diagnosis.%针对LEO(Low Earth Orbit,近地轨道)卫星的太阳电池阵输出功率衰减问题,在分析卫星轨道半长轴、太阳入射角、日地距离等参数变化与影响的基础上,提出按照轨道衰减快慢来区分太阳活动高年与低年,进而通过区分高年与低年,再根据不同季节分别进行太阳电池阵输出功率的衰减估计,而无须做功率归一化.同时,重点关注了夏至前后的最低输出功率的衰减情况,以此作为在轨卫星长期管理中的能源参考,建立平均电流和功率衰减因子估计模型,并结合实际工程数据进行了衰减估计.结果表明,太阳电池阵输出功率的年衰减因子约为-0.012,年衰减率约为1.2%.该结果可应用于在轨卫星长期管理的遥测诊断辅助.

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