基于模型的航天器在轨传感器故障诊断方法

A MODEL-BASED ONBOARD FAULT DIAGNOSIS FOR SPACECRAFT SENSORS

故障诊断技术对于确保航天器的可靠性和安全性至关重要。而对于航天器自主和实时的在轨故障诊断更是十分必要。为了要满足航天器在轨故障诊断系统高可靠性的要求 ,在轨诊断系统必须建立传感器故障诊断机制。本文研究了在轨故障诊断的技术特点 ,分析了现有的传感器故障诊断方法 ,提出一种基于分析冗余信息的适于航天器在轨传感器故障诊断的方法。这是一种基于物理模型的方法。利用该方法开发的诊断原型系统针对某试验台的诊断 ,验证了该方法的正确性和有效性。

Fault diagnosis technique has become of vital importance in ensuring the reliability and safety for spacecrafts. Onboard fault diagnosis for spacecrafts can play a significant role in space automation and real-time diagnosis.Diagnosis mechanism onboard for sensor faults in spacecrafts must be set up to meet and enhance high reliability of onboard diagnosis system for spacecrafts.In this paper the technique characteristic of fault diagnosis onboard is analyzed,existing techniques of sensor validation are briefly introduced and analyzed, and a method of sensor validation onboard for spacecrafts through analytical redundancy is presented.This method is based on a physical model. Some faults set in a testbed is diagnosed by the diagnostic system prototype developed by this method. So the method is verified and validated. The method can be used in engineering practice.