Sensor failure estimators for detection filters

The processing of (detection filter residuals) in order to detect and identify sensor failures is considered. Simple projection techniques are shown to be inefficient, so a single sensor failure-tracking estimator is derived. This estimation filter uses the planar nature of the detection filter residuals resulting from a sensor failure to improve the performance of both the detection and identification of failures. The performance improvement is illustrated using data from a simplified model of a turbofan engine