天线伺服系统的快速辨识算法  

A fast algorithm of system identification for antenna servo systems

作　　者：卢洁莹[1] 苏为洲[1] LU Jie-ying;SU Wei-zhou(School of Automation Science and Technology,South China University of Technology,Guangzhou Guangdong 510640,China)

机构地区：[1]华南理工大学自动化科学与工程学院

出　　处：《控制理论与应用》2019年第8期1329-1335,共7页Control Theory & Applications

基　　金：国家自然科学基金项目(61673183);华南理工大学第五批探索性实验项目(Y9180660)资助~~

摘　　要：天线伺服控制系统在移动卫星通讯中起着关键性作用,其对象模型的品质直接影响天线伺服控制系统的设计与性能.本文针对天线伺服系统的建模问题提出一种基于系统阶跃响应的快速优化建模方法.利用这一结果,本文建立了0.9m小口径天线伺服系统的二阶模型.进一步,讨论了基于系统伪随机响应谱密度函数的模型有效性验证方法和模型品质的评价准则,并分别在频域和时域中将由本文方法及最小二乘法所得的模型与系统实际数据进行对比分析.本文辨识方法的优点是计算简单,易于工程应用,对系统阶次不敏感并且能较为精确地描述系统主谐振峰的特性,适用于实际工程中的参数在线整定.Antenna servo control systems play a key role in mobile satellite communication.The quality of plant models directly affects the design and performance of the control systems.This paper proposes a fast modelling method based on the systems’step responses for the modeling problem of antenna servo systems.Using this method,we establish a secondorder model for a 0.9 m small-caliber antenna servo system.Based on the spectral density function of the system’s pseudorandom response,the validity of the model is studied and an evaluation criterion of the model quality is given.In the time domain and frequency domain,this model is compared with the experiment data and the models obtained by using the least squares identification method,respectively.The advantages of the proposed identification method are simple in calculation,ease for engineering application,insensitive to system’s order.Moreover,the proposed method can identify servo systems’resonant frequency quite accurately and is suitable for controller parameter online tuning of feedback systems.

关 键 词：系统辨识 欠阻尼二阶系统 阶跃响应 天线伺服 模型验证 

分 类 号：TN9[电子电信—信息与通信工程]