北斗IGSO/MEO卫星姿态控制及光压差异分析

Beidou IGSO and MEO navigation satellites' yaw-steering and orbit-normal attitude control modes and solar radiation pressure difference analysis

为规避GPS等国外卫星导航系统动态偏航姿态控制模式中的地影机动以及正午和午夜机动,北斗IGSO/MEO卫星采用了动态偏航和零偏航两种姿态控制模式。针对姿态控制模式引起的卫星本体、帆板受照及光压力的变化对定轨、定位解算造成的影响,该文通过对卫星姿态及受照的分析,查找由于姿态变化所造成的卫星光压摄动力变化的转换点,指出引起动偏、零偏下卫星光压摄动力差异的主要因素是零偏下入射太阳光线与太阳帆板不垂直,存在小角度夹角;两种姿态控制模式下光压摄动力的差异量级在10-8 m/s2。该研究成果可以为北斗卫星轨道确定提供技术支持。

To avoid the shadow crossing maneuver and the noon and midnight turn maneuvers of the GPS satellites using only Yaw-steering attitude control mode, IGSO and MEO satellites of Beidou naviga tion system uses two attitude control modes, which are Yaw-steering mode and Orbit-normal mode. Based on the satellite attitude and sun exposure analysis, this paper tried to find the solar radiation pressure transition points caused by the satellite attitude changes. And it was pointed out that the main factor cau- sing solar radiation pressure difference was the incident sun light not extends perpendicular to the solar panel surface. The difference of solar radiation pressure could reach 10-8 m/s2. The results could provide technical support for Beidou satellites orbit determination.