高精度天线指向控制算法的研究

Research of Control Algorithm for Antenna High Pointing Accuracy

随着射电天文的发展,大口径天线的角分辨率越来越高,对天线指向精度的要求高达1″量级。由于天线伺服驱动力矩的脉动造成低频谐振,传统PI(D)调节器难以满足更高指向跟踪的需求。结合射电望远镜的工况、伺服控制目的及控制器设计原则,采用一种基于线性自抗扰控制算法,并应用于某天线位置环仿真。分析结果表明,该算法不仅有良好的动态性能和控制精度,而且有较强的鲁棒性。

With the development of the radio astronomy and the demanding for the angular resolution, the pointing error of the telescope receives a very strict limitation close to 1＂. In fact, it is the pulse torque that usually results in low frequency resonance exert to the antenna servo system, and the traditional PI （D） controller could not satisfy such high pointing accuracy requirements. In this paper, considering working condition of radio telescope and purpose of servo control, as well as the design principle of controller, a control algorithm based on the Linear Active Disturbance Rejection Controller （LADRC） is put to use. We applied this method to the position loop simulation of an antenna under the Simulink environment. The results prove that the LADRC control algorithm shows better dynamic property, higher control accuracy and stronger robustness.