空天飞行器椭圆式无动力着陆轨迹设计方法

A Method for Designing Elliptical Unpowered Landing Trajectory of Aerospace Vehicle

针对空天飞行器无动力着陆轨迹设计问题,提出一种椭圆式高度剖面的离/在线轨迹设计方法。传统设计方法在参考航天飞机轨迹设计方法的基础上进行优化改进,但避免不了设计过程中参数繁多、连续性较差等缺点,并且不能够在飞行器着陆过程中在线更新轨迹以保证着陆精度。以往的在线轨迹设计方法计算量大、对机载计算机的计算能力要求较高。提出的设计方法克服了传统方法的缺点,在满足各项指标要求的同时更具有连续性与平稳性,并且该方法简单、快速,适用于飞行器在线生成轨迹。

Aiming at the problem of the unpowered landing trajectory design of the aerospace vehicle,an off-line/on-line trajectory design method of elliptical height profile is proposed.The traditional design method is optimized and improved on the basis of the trajectory design method of space shuttle,but it cannot avoid the shortcomings of many parameters and poor continuity in the design process,and cannot update the trajectory online in the process of aircraft landing to ensure the landing accuracy.The previous online trajectory design methods have large amount of calculation and high requirements for the calculation ability of airborne computers.The proposed design method overcomes the shortcomings of the traditional method,and has more continuity and stability while meeting the requirements of various indexes.This method has the characteristics of simplicity and rapidity,which is suitable for on-line trajectory generation of vehicle.