一种晨昏轨道卫星地球反照系数估计方法

Earth Albedo Coefficient Estimation for Dawn-Dusk Orbit Satellite

针对地球反照对太阳同步轨道卫星太阳电池阵输出电流的影响,首先比较不同降交点地方时卫星的太阳电池阵输出电流,分析其变化规律,然后选定晨昏轨道卫星作为研究对象,建立太阳电池阵输出电流模型与地球反照系数估计模型,利用最小二乘法估计电流参数与地球反照系数,最后结合不同季节、不同轨道高度卫星的遥测数据进行在轨验证。结果表明,对于轨道高度在1200 km以下的晨昏轨道卫星,地球反照系数在0.05以上;地球反照系数随轨道高度增加呈指数规律衰减,衰减系数约为0.002。

With respect to the effect of earth albedo on solar array output current of sun-synchronous orbit satellite, the solar array oUtput current is analyzed for different local times of descending node, and is modeled by taking the dawn-dusk orbit satellite as a research object. Estimation of earth albedo is modeled too. By use of the least square method, both models are used to estimate current parameters and earth albedo coefficients with different orbit height satellite telemetry in different seasons. Validation has shown that the earth albedo coefficient is above 0.05 with a height of 1200 km below, and is attenuated exponentially with an attenuation factor of 0. 002 with the increase of the orbit height.