Patent ID: 7933725

Claim:
A method implemented using a processor of detecting and/or isolating a fault of a sensor in a system, the method comprising: using the processor to determine a total spectral energy of a signal of the sensor over a predetermined range of frequencies within a single window of samples of the signal, the sensor configured to measure a first state indicator of a state of the system, the state defined by a plurality of state indicators including at least the first state indicator and a second state indicator different from the first state indicator; comparing the determined total spectral energy with a spectral energy of a signal representing the second state indicator, where the energy of the signal representing the second state indicator is present within the single window of samples, and regardless if the signals are periodic or aperiodic; and based on the comparing and on a predetermined relationship between dynamic variation of the first state indicator and dynamic variation of the second state indicator, evaluating performance of the sensor.