时变大气模型应用于低轨卫星自主定轨

Time-Varying Atmospheric Model and Its Application to LEO Satellite Autonomous Orbit Determination

本文提出对太阳辐射与地磁活动长期预报参数进行修正,以确保参数的时变特性。修正后的参数作为高精度时变大气密度模型的输入,应用于低轨卫星自主定轨,保证大气阻力长时间内的实时自主计算。以CHAMP卫星为对象进行试验分析,结果表明:该方案的自主定轨精度整体优于传统的静态模型;且不会对星上计算效率产生太大影响;时变大气模型应用于低轨卫星自主定轨是可行的。

The time-varying atmospheric density model is more accurate than the static one,but more complex and usually applied to the post-processing of LEO satellite precise orbit determination.An idea was presented in this article that this would be applied to LEO satellite autonomous orbit determination for real-time calculation of atmospheric drag,by entering the long-term forecast parameters of solar radiation and geomagnetic activity which was modified to ensure the time-varying characteristics.The test on the CHAMP satellite showed that this idea was feasible with higher accuracy than the traditional static model,and would not have much impact on the computational efficiency on-board satellite.