考虑可重复使用运载器耦合特性的改进标准轨道制导方法

摘要

An advanced methodology for entry guidance with single control variable is developed based on the characteristics of the nonlinearity, high dynamics, multiple constraints and strong coupling of reentry vehicle, which is able to overcome the disadvantages of existing guidance law–first define the angle of attack profile for trajectory planning, then modify the angle of bank for trajectory tracking . The approach adopts an angle of attack tracking loop to reduce influence of the bank variation on the angle of attack in consideration of the coupling among three channels and the actual flight capacity. Numerical simulation results show that the actual angle of attack can track the desired inputs perfectly, with the tracking error less than 1°, so as to improve the guidance accuracy and expand the application of traditional guidance with single control variable.%针对可重复使用运载器再入返回段非线性、高动态、多约束、强耦合的特点，对传统意义上先根据飞行任务给定攻角变化曲线，再采用跟踪技术通过调整倾侧角进行轨迹跟踪的标准轨道制导方法进行完善，在考虑三通道耦合及实际飞行能力的情况下，通过引入攻角保持回路，改善倾侧角变化对实际攻角的影响。仿真结果表明，实际攻角能够很好保持在给定攻角附近，跟踪误差小于1°，从而保证再入制导精度，实现对标准轨道的稳定跟踪，使传统的单控制变量制导方法具有更广泛的适用性。