Patent ID: 8010320

Claim:
A method for mitigating effects of gas turbine engine gas path measurement variability comprising: comparing gas path measurement data to a reference model and outputting differences between the gas path measurement data and said reference model as percent deltas; performing a gas path analysis using a predictor-corrector function on said outputted percent deltas and a priori estimated performance percent deltas, and outputting estimated performance percent deltas of the gas path measurement data; time delaying said estimated performance percent deltas using a delay register which stores a most recent set of said estimated performance percent deltas; forming said a priori estimated performance percent deltas by filtering said time delayed, estimated performance percent deltas using an exponential average filter; said time delaying and filtering steps reducing a variation in estimated performance percent deltas, said variation comprises noise; inputting the a priori estimated performance percent deltas to a fault estimator along with data input so as to form a new set of estimated performance percent deltas based on the a priori estimated performance percent deltas and the data input; and outputting said new set of estimated performance percent deltas.