大气阻力对静稳态飞行目标落点预报影响评估

Evaluation of Influence on Impact Point Prediction of Re-entry Altitude Vehicle Caused by Air Drag

大气阻力对高空静稳态飞行目标运行轨迹的影响是航天测控领域的研究热点与难点问题。在分析空间飞行器受力状况基础上,根据飞行器运动学状态方程,通过数值模拟方式定量评估了大气阻力对飞行器运行轨迹影响。结论表明:在再入段中,大气阻力是影响飞行器运行轨迹的最主要影响因素,对飞行器落点位置会造成数百米乃至数千米位置偏差,同时使落地时间有较大变化。

Howto accurately track the flight trajectory of altitude vehicle at unpowered phase is the hot and tough problem in the field of space measurement and control. Based on the analysis of forces acting on the flight vehicle,its rigid movement state equation has been established,and the quality control scheme has also been put forward adopting hierarchical clustering technique to figure out the precise position of the impact point. The feasibility and effectiveness of the suggested quality control scheme has been illustrated by simulated example,in which the influence caused by air drag,gravity and iterative step has also been researched.The conclusion shows that the flight trajectory of altitude vehicle at unpowered phase could be accurately calculated with the offered mathematics model,and the impact point could be automatically estimated.