用现代时域法设计BTT导弹自动驾驶仪

MODERN TIME DOMAIN METHOD FOR DESIGN OF AUTOPILOTS FOR BANK-TO-TURN MISSILES

本文先建立了高性能BTT导弹控制系统和两个横向加速度指令数学模型。由于高性能BTT导弹滚转速率较大,俯仰、偏航通道间存在强动力学耦合,但滚动通道可以近似解耦。然后,用本文给出的模型跟随理论设计俯仰一偏航通道自动驾驶仪,用线性二次型理论设计滚动通道自动驾驶仪。为了满足远程全空域BTT导弹作战要求,自动驾驶仪中的增益是滚转速率和动压头的函数。最后,利用某典型地空导弹动力学模型进行了六自由度数字仿真,计算结果表明设计出的自动驾驶仪对导弹结构参数、气动参数、高度等变化具有良好的鲁棒性,导弹侧滑角、脱靶量很小。

This paper first derives a mathematical model of a bank-to-turn missile control system with two lateral acceleration commands. Owing to the high roll rate of the high performance bank-to-turn missile, there is strong dynamic coupling between the pitch and yaw channels, but the dynamics of the roll channel can be approximately decoupled from them. Then the pitch-yaw channel autopilot is designed by the model following design approach given in this paper while the roll channel autopilot is designed by using linear quadratic theory. In order to satisfy the operational requirements of long-range surface-to -air BTT missiles, the gains of the autopilot are taken as functions of the roll rate and the dynamic pressure. Finally, the performance of the autopilot is evaluated by the six-degree-of-freedom simulation in a dynamic model of a typical surface-to-air missile. The computation results have shown that the autopilot has good robustness for the changes of structural and aerodynamic parameters, flight height of the missile, etc., and the missdistance and the sideship angle are very small.