航天器气动耦合六自由度姿轨动力学多步法积分预报误差分析

Errors Analysis of Multi-Step Integral Prediction on Aerodynamically Coupled Six-Degree-of-Freedom Spacecraft

航天器轨降过程中的姿态估计是载人航天领域中的重要一环.随着近些年测站精度的提高,任务要求的增加,且研究表明姿态会影响航天器轨降过程中受到的气动力,进而对轨道产生影响,因此发展高精度姿轨耦合预报对航天器状态实时测控至关重要.本文以“天宫一号”航天器轨降过程中姿轨耦合沿弹道联合预报为背景,研究线性多步法积分误差对大型航天器姿轨预报精度的影响.具体包括Adams-Bashforth法、Adams-Moulton法、预估校正法等,为大型航天器轨降过程中的姿轨耦合预报以及落点预报提供数据参考.

Spacecraft attitude estimation during orbit descent is an important part in the field of human spaceflight.With the increase in station measurement accuracy and mission requirements recently,it has been shown that attitude affects the aerodynamic forces on the spacecraft during trajectory descent,which in turn affects the orbit.Therefore,the development of high-precision attitude-orbit coupling pre-diction is crucial for the real-time measurement and control of spacecraft.In this paper,the forecast of aerodynamic coupling along the ballistic trajectory during the trajectory descent of the Tiangong-1 space-craft is taken as the background,and the influence of the integral error of the linear multistep method on the forecast accuracy of the spacecraft are studied.The multistep methods include the Adams-Bashforth,Adams-Moulton,and prediction correction method,etc.The results provide references for the attitude-orbit coupling prediction and the fallout prediction missions during the trajectory descent of the large spacecraft.