基于能量的高超声速飞行器再入混合制导方法

针对大升阻比高超声速飞行器滑翔再入制导问题，提出一种基于能量的混合制导方法.建立以能量为自变量的三自由度运动学方程，利用拟平衡滑翔特性将过程约束转换成倾侧角约束.纵向制导在初始下降段采用固定数值倾侧角飞行，在拟平衡滑翔段基于剩余航程随能量单调变化的特性将标准轨迹进行分段，然后分段进行在线预测校正制导.侧向制导基于横程与能量的近似线性关系，设计了由分段漏斗形横程走廊控制的倾侧角反转逻辑，以保证侧向制导精度.分析研究和仿真结果表明该方法易于实现，有效减小了制导指令的解算时间，制导和落点精度高，且对再入初始偏差及过程扰动不敏感. 

Energy-based hybrid reentry guidance for hypersonic vehicles

An energy-based hybrid reentry methodology was developed for hypersonic vehicles. The three-degree-of-freedom reentry kinematic equations was conducted based on energy, and typical inequality constraints was converted to the constraints of bank-angle by using quasi-equilibrium glide condition (QEGC). Longitude guidance used a constant bank angle in initial descent, and segmented the standard trajectory in quasi-equilibrium glide phase since the range-to-go was monotonically decreased with energy, then used predictor-corrector online in every segment to reduce the calculating time. Lateral guidance designed a lateral reversal logic based on the crossrange corridor for crossrange varied almost linearly with energy between two bank reversals. The simulation results show that the proposed algorithm has the obvious decrease of calculating time, high guidance precision and is not sensitive to initial errors and disturbers.