基于ESO的用户星天线跟踪指向控制技术

基于独特的非线性扩张状态观测器(ESO),提出了一种用户卫星天线跟踪指向控制系统。该系统由程序跟踪内环和自动跟踪外环组成。内环控制器由三阶ESO、线性比例微分控制律和静态解耦律组成。外环控制器为一简单的积分控制器。ESO能够在不依赖天线模型的情况下估计出系统状态和总扰动(称为扩张状态)。利用该扩张状态实现动态反馈补偿,则天线系统被简化为解耦的积分系统。基于ESO设计天线控制系统,无需精确的用户卫星天线模型。仿真结果表明,提出的天线控制系统具有较高的跟踪指向性能和对干扰和不确定性具有较强的鲁棒性。

Extended State Observer Based Technique for Antenna Tracking and Pointing Control of User-Satellite

Based on a unique nonlinear extended state observer (ESO), a new nonlinear control solution to the problems of the antenna tracking-pointing control for User-satellite was proposed. The antenna control system has two operating loops: the inner loop of program track (PT) and the outer loop of autotrack (AT). The inner-loop controller is composed of a third-order ESO, a linear proportional-derivative control law and a static decoupling law. The controller in the outer loop is a simple integrator. ESO can estimate the states of the antenna system and the total disturbance (called as the extended state) in a model-independent way. The dynamic compensation with the extended state reduces the system to approximately a decoupled integrator system. The antenna tracking-pointing control system based on ESO was designed without an explicit mathematical model of the antenna. The simulation results show that the proposed antenna control system has the high tracking-pointing performance and the strong robustness against the disturbances and the uncertainties.