基于非线性干扰观测器的拦截弹动态逆控制

针对直接力/气动力复合控制的临近空间拦截弹,提出了一种基于非线性干扰观测器(nonlinear disturbance observer, NDO)的动态逆复合跟踪控制器设计方法。首先设计NDO,对系统的不匹配干扰进行估计,并通过干扰估计值设计前馈补偿项来有效消除外部干扰对系统的影响。接着,设计基于NDO的动态逆复合控制律,获取期望控制力矩。然后,利用动态控制分配技术将期望控制力矩分配到气动舵和反作用喷流装置。最后,仿真结果表明,所设计复合控制器对过载指令具有较好的跟踪效果,适用于临近空间拦截弹复合控制。

Nonlinear disturbance observer-based dynamic inverse control for near space interceptor

A nonlinear disturbance observer (NDO) based dynamic inverse tracking controller is proposed for the near space interceptor with reaction jets and aerodynamic force. Firstly, an NDO is proposed to estimate the mismatched disturbance, and a feed forward compensator based on the disturbance estimated value is designed to effectively remove the effect of the external disturbance. Based on the NDO, a dynamic inverse composite controller is constructed to derive the desired control moment. Then, the desired control moment is allocated to the aerodynamic fins and the reaction jets using the dynamic control allocation method. Finally, simulation results show that the proposed control scheme can track the overload command with high precision, and it is applicable to the blended control of the near space interceptor.