基于虚拟再入角的快速离轨制动制导方法

To meet the requirement of rapid deorbit of reentry vehicles, an online guidance algorithm for rapid deorbit based on virtual reentry angle is proposed. On the basis of analyzing the guidance mechanism of the pulse deorbit, the finite thrust method is used to gradually approach the terminal state so as to meet the shift requirements of the reentry angle and reentry speed. The convex optimization method is used to calculate the time-optimal trajectory that meets the multi-terminal constraints. Combined with the simulation results of the finite thrust guidance algorithm, the trajectory characteristics are analyzed, the concept of virtual reentry angle is proposed, and an online guidance algorithm for fast deorbit considering multi-terminal constraints is designed. The proposed method is compared with the existing methods from the aspects of computational efficiency and guidance accuracy, Monte-Carlo simulations are carried out under the condition of deviation of the thrust magnitude and direction of the engine. The simulation results show that compared to the existing algorithms, the proposed algorithm achieves the goal of rapidity in the deorbit stage and can meet the needs of online computing while ensuring the same control accuracy.