Study Of All-Course Trajectory Planning Approach For Hypersonic Boost-Glide Vehicles

In recent years,hypersonic boost-glide vehicle has become a research hotspot in the aerospace field,due to the advantages of long-range rapid response and large-scale maneuver penetration.Based on the analysis of trajectory characteristics and flight missions at each flight stage,this paper studies the all-course trajectory planning problem under changing launching points,the feasible trajectory planning with no-fly zone and waypoint constraints,and the identification of coverage ability and trajectory optimization problem.Modeling and analysis for all-course trajectory planning problem under complex constraints are carried out.1)The dynamic model of the boost-glide vehicle is established,and the definition and transformation of the states at different phases are analyzed.2)Considering the constraints in different phases,a mathematical description model is established,and the constraints under uncertain conditions are studied.3)For the three transition points in the whole trajectory,the influence of the states of transition points is studied,which laid the foundation for the all-course trajectory planning.The rapid trajectory generation method under changing launch point is studied.1)A low-altitude program model of boost phase is designed and the related parameters are calculated quickly by Newton iterative method.2)Parametric control variable of the initial descent phase which satisfies both the terminal height and the gliding constraint is designed.The feasibility of the planning result under the bias condition is verified by the LQR method.3)The drag acceleration profile planning method is put forward,and the analytical prediction of gliding range is realized,which meets the rapid adjustment of different range conditions.4)The Sequential Quadratic Programming method is used to solve the 3D trajectory planning problem in the dive phase,which effectively improves the adjustment ability of the dive phase with higher accuracy.5)The validity and convergence of the whole trajectory rapid programming method are verified under two modes,that is,all-course calculation and partial calculation modes.Aiming at the no-fly zone,waypoint and terrain constraints,a feasible trajectory planning method under complex multi-constraint conditions is studied.1)Considering the avoiding of the no-fly zone,the energy regulation strategy in boost phase is proposed,and the program angle is designed with speed as the independent variable to improve the adaptability.2)The initial descent phase is divided into the adjustment and transition phases,and the parametric models of the control variables are established.The continuity of the controller and the avoidance of the no-fly zones are achieved.3)A gliding trajectory planning method based on quasi-equilibrium glide condition and the 3D acceleration profile is proposed.Through the joint adjustment of longitudinal plane and lateral plane,no-fly zone avoidance and waypoint crossing are realized.4)Considering the complex terminal terrain constraints,the sub-plane design method is adopted to realise the 3D trajectory of the dive phase.5)Given the conditions of several transition points,the feasibility of all-course trajectory planning under complex and multi-constraint conditions is verified.Aiming at the optimization indexes such as the optimal approach,the minimum jump and the minimum energy consumption,the footprint generation and the all-course trajectory optimization method are studied.1)In order to solve the optimal control problem of virtual target approaching,an indirect optimization method is used.Landing footprint generation under the current initial conditions is achieved.2)Based on the strategy of variable angle-of-attack profile,the longitudinal and lateral profiles are designed at the same time using the 3D acceleration profile planning method.Landing footprint under the joint adjustment of angle of attack and bank is obtained.3)Based on the RPM,the states and the control variables are discretized at the same time,and the segmental optimization strategy of hypersonic boost-glide vehicles is proposed.4)Taking the minimum jump and the minimum energy consumption as the optimization indexes,the all-course optimal trajectory is achieved,which laies the foundation for the development of the flight capability and the formulation of the flight mission.This paper expands the scope of the research on the trajectory planning and penetration of hypersonic boost-glide vehicles.The research results have important reference for the future development of hypersonic transport system and the long-range strategic strike weapon.