余度惯性传感器系统的故障管理方案

本文阐述两种余度惯性传感器系统的故障管理方案:引入动态解析余度的逻辑比较法和采用方差补偿的极大似然检验法。前者通过引入动态解析余度,能够在逻辑比较法的基础上,最大限度地识别与隔离故障仪表,提高余度系统的容错能力;后者考虑了仪表误差对故障检测的影响,因而提高了系统检测软故障的能力。最后,对两种方案的优缺点作了分析比较。

THE FAILURE MANAGEMENT SCHEMES OF REDUNDANT INERTIAL SENSORS SYSTEM

Two failure management schemes of redundant inertial sensors system are discussed. The first is the logical comparison algorithm with analytical redundancy. It makes redundant systems have higher fault-tolerant ability. Analytical redundancy are generated by linear estimation method. The second is GLT (Generalized Likelihood Test) algorithm with error covariance compensation. By using this method,the effects of normal sensor errors will not adversely affect failure detection and isolation performance. It will allow the redundant system to detect smaller failures. Finally,the comparison of two schemes are given.