基于EKF残差向量的编队卫星测量器件故障诊断

Fault Diagnosis for Measurements of Formation Flying Based on Residual Vector of EKF

针对同时采用两个测量装置,即无线电和GPS的编队卫星可能发生的测量器件硬故障情况,提出了两种基于解析余度的状态估计故障诊断方法。即首先分别采用无线电测量和GPS测量得到的测量数据作为观测量并联合编队卫星的相对状态进行广义卡尔曼滤波,然后得到残差序列,基于该残差序列设计出了残差加权平方和检验法和残差χ2检验法,最后通过仿真实例对所给出检验方法进行了比较。

A kind of method of fault diagnosis based on analytic redundancy analysis was proposed for wireless metrology equipment and GPS metrology equipment.Firstly,the relative state vectors between the satellites were estimated with extended kalman filtering using measurement data,which were from wireless metrology and GPS metrology,and the relative state equation.Then the residual vector was gained.On the basis of this,two fault detection methods were proposed.The one was based on weighted sum-squared residual,and the other was-based detection method.Finally,the results of the two methods were compared by the simulation.