基于扰动观测器的AUVs固定时间编队控制

Fixed-time Formation Control of AUVs Based on a Disturbance Observer

考虑含有模型参数不确定及未知海洋扰动的多AUVs协同编队问题,本文提出一种新的控制方法,该方法可保证编队在固定时间内实现.首先,将模型参数不确定及海洋扰动看作复合扰动,设计扰动观测器,实现固定时间内对扰动的精确估计.基于扰动观测器,指令滤波技术、固定时间理论及虚拟轨迹概念,设计编队控制律,实现编队目标,并保证闭环系统中的所有信号是全局固定时间稳定的.最后通过两艘AUV的编队仿真验证了所提算法的有效性.

The paper is concerned with formation control of autonomous underwater vehicles (AUVs) subject to model parameter uncertainties and unknown ocean disturbances, a novel control scheme is developed, by which the formation can be achieved within a fixed time. The ocean disturbance is combined with the model parameter uncertainties as a compound disturbance. Then a disturbance observer (DO) is constructed to estimate the compound disturbance, which can be achieved within the settling time with zero estimation errors. Based on the DO, command filter technique,fixed-time control and virtual trajectory, a formation control law is designed, by which the formation control can be achieved with all the states globally stabilized in a given fiˉxed time. The effectiveness of the proposed control scheme is demonstrated by numerical simulations.