一种基于不对称再入体的制导与控制方法研究

Research on a Rolling Guidance Law of Asymmetric Reentry Vehicle

研究一种不对称再入体的再入机动控制方法。不对称再入体气动外形简单,它的升力大小一般不可控,但可通过滚动控制调整升力的方向实现机动飞行。为实现不对称再入体的精确制导,本文研究了一种滚速可调的"滚转制导律",通过调整制导系数,可以兼顾再入体滚动角速度和落点精度的要求;设计了不对称再入体滚动通道的喷流控制方案,给出了滚动姿态角的时间最优控制算法;通过六自由度数学仿真,验证了整个制导控制方案的可行性和有效性。

A reentry maneuver technique of asymmetric reentry vehicle is researched. The asymmetric reentry vehicle has simple atmospheric configuration, and the magnitude of lift commonly can not be changed arbi- trarily. The roll angle can be regulated to orient the lift vector to achieve maneuverability. A ＂Rolling Guid- ance Law＂ is presented. Under the right choice of the guidance coefficient, the rolling guidance law is able to accurately steer the asymmetric vehicle while maintaining moderate roll rates. A thruster-based roll control system is designed and a time-optimal control law is adopted to control the rolling angle. The results of sim- ulation validate the feasibility and efficiency of the entire guidance and control system.