MEO卫星内部充电环境及典型材料充电特征分析

文章利用通用模型DICTAT,计算了恶劣期地球中高轨道(MEO)高能电子通量随卫星运行位置的变化情况以及日均积分能谱,之后选择4种参数具有代表性的电介质材料,分析了其在MEO环境下的充电特征,并将上述结果与地球同步轨道(GEO)情况进行了对比。结果表明,通常而言MEO卫星的内部充电风险更高,平均充电电位是GEO的3倍左右,而且充电电位在整个轨道周期内起伏变化明显,电位达到最高值的时间相对于高能电子通量最大值有0.3~0.9 h的延迟,具体的变化特征由电介质材料时间常数决定。

Internal charging environment and typical charging characteristics of MEO

This paper prestnts the calculations of the worst-cast high energy electron flux of MEO against the satellite''s orbit position and the daily-averaged electron spectra by using the general DICTAT model. For the selected four kinds of typical dielectric materials, we analyzes their charging characteristics in the environment of MEO. The results are compared with those in GEO. It can be concluded that usually, the internal charge risk in MEO is about three times higher than that in GEO, and the charged potential shows obvious fluctuations in the whole orbital period, with 0.3-0.9 h of delay of the high of the charged potential in contrast to the high of the electron flux. The overall profiles are determined by the time constants of the dielectric materials.