晨昏轨道卫星三结砷化镓太阳电池阵功率衰减估计

Estimation to Power Degradation of GaInP2/InGaAs/Ge Solar Cell Used in Dawn-Dusk LEO Satellites

文章针对空间环境对于GaInP2/InGaAs/Ge太阳电池输出功率衰减影响,以运行轨道高度接近1000km的某晨昏轨道卫星为对象,在分析轨道半长轴与倾角摄动、光照角变化、降交点地方时漂移、日地距离波动等因素的基础上,首先讨论了电池工作温度和输出电流变化,建立太阳电池输出电流拟合模型;提出了发展拟合电流的归一化处理新方法,进行光照角、温度、地球反照归一化,重点减小太阳光源功率波动的影响;最后,利用实际在轨数据进行检验。结果表明,利用新方法得到的电流数据衰减特征明显,一致性较好;太阳电池功率衰减因子约为-1.02×10^(-5)/d,年衰减率约为0.372%;在轨15.5年后,输出功率衰减预测约为6.6%;GaInP2/InGaAs/Ge太阳电池抗辐照性较好,适宜于近地空间长寿命应用场合。该方法可应用于在轨卫星长期测控与管理中的遥测诊断、能源估计与预测、器件健康状态评估等方面。

With respect to output power degradation of GaInP2/InGaAs/Ge solar cell influenced by space environment,a LEO( Low Earth Orbit) satellite running on dawn-dusk sun synchronous orbit with height of about 1000 km is sampled to provide telemetry data. Details on orbit perturbation of semi major axis and inclination, solar incidence change, LTDN( Local Time of Descending Node) shift and variation of distance from the Sun to the Earth are discussed, and situations involving solar cell current and temperature are investigated to analyze. By modeling solar cell current fitting,a new method is presented to normalize the fitting current with solar incidence, temperature and Earth albedo. To demonstrate mitigation of impact of solar power varying,estimation to degradation is examined by on orbit satellite telemetry. Here results show that solar cell current is degraded obviously with consistency data, and power degradation factor is about-1.02 × 10-5/d which is 0. 372%of power decreasing annually,and prediction to degradation is less than 6. 6% in 15. 5 years after launch and early orbit phase. In a word, GaInP2/InGaAs/Ge solar cell has a better irradiation performance and is more feasible to supply electric power source for longevity LEO satellite. This new method is applicable to assisting telemetry diagnosis, energy estimation and prediction, and device SOH( State of Health) evaluation for long term management of satellite in TT&C( Telemetry,Tracking and Command).