关键词: 高度速度(H-V)剖面, 再入轨迹规划, 路径约束, 终端约束, 二次型增量

Abstract: A reentry trajectory planning method is proposed for the lifting reentry vehicle in the dense atmosphere. With the preset profile of angle of attack, the path constraints (heating rate, dynamic pressure and overload) are used directly to obtain the lower boundary of the reentry trajectory in the height-velocity profile; the terminal constraints are used to determine the height increment on the basis of the lower boundary, and then the reentry trajectory is generated by adding the height increment to the lower boundary. The increment is selected in the form of a segment quadric function, and its magnitude can be obtained quickly by the secant method. The magnitude of the bank angle can be obtained according to the dynamic equation, and the sign of the bank angle is determined by the heading error angle corridor. The simulation results under the typical working conditions indicate that the proposed method can plan the reentry trajectory rapidly with good adaptability.

Key words:  H-V profile, Reentry trajectory planning, Path constrains, Terminal constrains, Quadratic increment