三维非线性预设性能制导律设计

Design of 3D nonlinear prescribed performance guidance law

针对高速机动目标拦截,提出了一种末制导阶段预设性能制导律。首先,建立三维非线性拦截模型,在俯仰和偏航两个平面中,将期望视线角和视线角速率选做状态量设计滑模动态面,在动态面控制的基础上,将滑动模态误差利用误差转换函数转化为预设性能误差方程,设计制导律,驱动滑模变量按预设性能收敛。该制导律能使制导顺利进行,满足终端视线角约束。然后,考虑视线角速率测量误差以及目标信息不确定性,建立有限时间干扰观测器,保证了制导指令的执行。

A prescribed performance guidance law for the terminal guidance phase is proposed for the interception of high speed maneuvering targets.At first,construct a three dimensional nonlinear block model,pitch and yaw of the two plane,will expect angle of sight and line of sight angular rate selected as state variable dynamic sliding mode surface design,on the basis of the dynamic surface control,the sliding mode error using the conversion function into the default performance error equation,design guidance law,drive the sliding mode variable according to the prescribed convergence performance.It can make the guidance go smoothly and satisfy the terminal line of sight angle constraint.Then,considering the measurement error of line of sight angular rate and the uncertainty of target information,a finite time disturbance observer is established to ensure the execution of guidance instruction.