钝头体载人飞船跳跃式再入预测-校正制导方法研究  

Study on Predictor-Corrector Guidance Law for Skip Reentry of Manned Spacecraft with Blunt Body

作　　者：郭涛[1] 宋征宇 施健峰[1] GUO Tao;SONG Zhengyu;SHI Jianfeng(Beijing Aerospace Automatic Control Institute,Beijing 100854,China;China Academy of Launch Vehicle Technology,Beijing 100076,China)

机构地区：[1]北京航天自动控制研究所,北京100854 [2]中国运载火箭技术研究院,北京100076

出　　处：《载人航天》2021年第2期149-157,共9页Manned Spaceflight

基　　金：载人航天领域预先研究项目(060101)。

摘　　要：针对钝头体载人飞船再入制导采用标准轨道法对不确定性因素缺乏鲁棒性且只适用于纵向航程较小情况等问题,提出了一种基于数值预测-校正的跳跃式再入制导方法。该算法通过实时预测跳跃段剩余航程与理论值之间的偏差以及数值积分,将倾侧角的规划问题转化为非线性单变量寻根问题,采用割线法迭代计算满足落点误差要求的倾侧角。将该方法应用于某载人返回飞行器再入轨迹设计,仿真结果表明该算法能够使再入轨迹满足终端落点条件及热流、气动过载、动压等过程约束,对各种不确定性因素及远航程再入情况具有较强的鲁棒性及适应性。The reference-trajectory entry guidance of the blunt body manned spaceship has poor robustness to uncertain factors and can only be applied to short downrange.To solve this problem,a predictor-corrector guidance algorithm for skip reentry was proposed.The bias between the predicted short range-to-go and the theoretical range-to-go was calculated in real-time,and by numerical integration,the problem of bank angle planning was formulated as a nonlinear univariate root-finding problem.The secant iteration method was adopted to compute the bank angle which was used to achieve high landing accuracy.The trajectory design method was used in a low lift-to-drag entry vehicle for verification.The simulation results showed that the reentry trajectory of this method could meet the constrains of the final landing condition,the load,the dynamic pressure and the heat flux.The reliable and robust performance of the algorithm in highly stressful dispersed conditions were demonstrated.Moreover,the algorithm also showed high adaptability to the long entry downranges situation.

关 键 词：预测-校正 再入制导 轨迹设计 载人飞船 

分 类 号：V44[航空宇航科学与技术—飞行器设计]