计算再入飞行器可达区域的快速算法

A rapid algorithm for generating landing footprint for entry vehicles

以无量纲反值能量为自变量建立了飞行器3自由度运动方程组,提出了一种改进的计算再入飞行器可达区域的快速算法.引入倾侧角反向策略,使计算的可达区域更精确;改进产生可达区域中间边界的插值方式,使计算结果更加均匀;改进了终端约束处理方法,使弹道更加平滑.以一种乘波体模型为例进行仿真验证,仿真结果表明改进算法计算的可达区域比现有算法更精确且弹道更平滑.

The 3 degree-of-freedom equations of motion of an entry vehicle was built by using dimen- sionless negative energy as independent variable, and an improved rapid algorithm that generating landing footprint was proposed. The footprint was more accurate by using reverse bank angle strategy, and the boundary was more uniformity by improving interpolate method. The trajectory was smoother by the handle technique of the final constraints. It was validated by a waverider vehicle, and simulation results indicate that the landing footprint computed by the improved algorithm is more accurate and the trajectory is smoother.