利用大气阻力的横向编队维持控制

研究了航天器在近圆轨道面内横向固定间隔距离内伴飞编队维持问题。基于经典轨道要素偏差法分析了相对运动特性和大气阻力对相对运动的影响。根据利用大气阻力引起的横向相对运动漂移,设计了有利于长期伴飞编队维持的初始半长轴偏差和伴飞边界点的期望半长轴偏差,进一步给出了进行伴飞维持的边界点横向速度脉冲。仿真结果表明,该控制策略进行伴飞编队维持是可行的,维持所需的速度脉冲次数少、速度增量小,且算法简单,有利于航天器自主化实现。

Control Strategy Using Atmospheric Drag for Along-track Formation Maintenance

A maintenance control strategy for formation spacecraft flying in a near-circular orbit with fixed along-track distance tolerance was presented.By using the classical orbit element differences method,the periodic characteristics of relative motion and the influence of atmospheric drag on relative motion were analyzed.Using the relative drifts of along-track motion caused by atmosphere drag,the initial semi-major axis difference and the expected semi-major axis differences at the bounds of along-track tolerance box for the long time formation maintenance were designed.Afterwards,the along-track maintenance impulsive delta-velocities implemented at the bounds were given.Numerical simulation results indicate that the formation maintenance control strategy is feasible and requires fewer times of impulse and less velocity increment.Furthermore,the control algorithm is simple to be implemented autonomously by spacecraft.