基于时变时滞T-S模糊模型的卫星光通信精跟踪系统模糊PID控制研究

项目名称： 基于时变时滞T-S模糊模型的卫星光通信精跟踪系统模糊PID控制研究

项目编号： No.61503096

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 自动化技术、计算机技术

项目作者： 曹开锐

作者单位： 哈尔滨工业大学

项目金额： 20万元

中文摘要： 相比于传统的微波通信，卫星光通信具有超高速数据传输、信息保密性好、功耗低等诸多优点。当激光通信链路建立后，卫星平台振动成为影响通信质量的关键因素。因此，要求卫星光通信终端的精跟踪系统具有很强的干扰抑制能力。一方面，精跟踪系统由压电陶瓷驱动的快速倾斜镜和CCD探测器组成，是一种典型的变时滞非线性系统，需要采用非线性控制器获得良好的抗干扰性能。另一方面，精跟踪系统在轨维护成本高，首选结构简单、可靠性高的控制器。为了解决上述矛盾，本项目基于T-S（Takagi-Sugeno）模糊控制理论，研究精跟踪系统的模糊PID控制器设计问题。首先，建立能够反映精跟踪系统动态特性的变时滞T-S模糊模型；其次，基于线性矩阵不等式，研究满足性能要求的模糊PID控制器设计问题；再次，将隶属度函数的信息引入到控制器设计之中，以降低设计的保守程度；最后，搭建实验平台，验证精跟踪系统的抗干扰能力及其对通信误码率的影响。

中文关键词： 精跟踪系统；T-S模糊模型；模糊PID控制器；时变时滞；线性矩阵不等式

英文摘要： Compared with traditional microwave communication, satellite laser communication has many advantages, such as super-fast data transmission, high information confidentiality, lower power consumption, etc. When the laser communication link is established, the vibration of the satellite becomes the key factor that affects the quality of communication. Therefore，the strong disturbance suppression capability of the fine tracking system of the satellite communication terminal is required. The fine tracking system consists of a fast steering mirror driven by a piezoelectric ceramic and a CCD detector, which is a typical nonlinear system with time-vary delay. Nonlinear controllers should be used to obtain good performances. However, the simple structure and the high reliability of fine tracking controllers should be guaranteed first, since the on-orbit maintenance would be ludicrously expensive. In order to resolve the contradiction, the fuzzy PID control for the fine tracking system is investigated based on the T-S (Takagi-Sugeno) control theory. Firstly, the T-S fuzzy model with time-varying delay is established to precisely reflect the dynamic characteristics of the fine tracking system. Secondly, the problem of designing fuzzy PID controllers to satisfy performance indexes is studied based on linear matrix inequalities. Thirdly, the information of the membership functions is brought into the controller design procedure to reduce the conservatism. At last, the experiment platform is built to test the disturbance suppression capability of the fine tracking system and its influence on the communication error rate.

英文关键词： fine tracking systems;T-S fuzzy models;fuzzy PID controllers;time-varying delay;linear matrix inequalities