卫星姿态控制系统在轨实时健康评估

On-orbit real-time health assessment of satellite attitude control system

面向航天器在轨智能自主管控的技术需求,提出一种基于多级模糊综合评价架构的卫星姿态控制系统的在轨实时健康评估方法.根据卫星姿态控制系统的性能特点,按实际功能将其划分为姿态测量、控制器和执行机构3个部分.在确定各部分单元部件健康信息的基础上,基于模糊综合评价算法对各部分的健康度分别进行评估.基于评估所得到的姿态测量、控制器和执行机构3部分健康信息,根据各部分对系统健康的影响情况结合变权综合原理确定健康影响权重,采用模糊综合评价算法实现对姿态控制系统整体健康性能的综合评估.仿真实验结果表明,所提出的方法能够有效实现卫星姿态控制系统的在轨实时健康评估.

According to technique requirements of on-orbit autonomous intelligent management and control for spacecrafts,especially for satellite systems,an on-orbit real-time health assessment method for satellite attitude control systems was proposed based on a multi-level fuzzy comprehensive evaluation framework. In view of performance characteristics and actual capabilities,a satellite attitude control system was divided into three parts of attitude measurement,actuating mechanism and attitude control. In this way,its health level may be determined by health status of three parts so that the fuzzy evaluation for every part was carried out at first and then the integrative health performance was given through synthetically weighted integration with the ones of three parts. Therefore a synthetic integration strategy with variable weights for different health conditions of various parts was employed to complete the comprehensive evaluation of satellite attitude control systems according to variable weight synthesizing principle,in which the variable weights depended on the membership degree of health level of various parts. Simulation experiment results demonstrate that the proposed health assessment method can achieve on-orbit real-time health assessment of satellite attitude control system effectively and efficiently.