Analytic redundancy for flight control sensors on the lockheed L-1011 aircraft

The implementation and flight test results of an analyticredundancy approach employing operational sensors to reconstruct signals of failed sensors is described. This method evolves from the concept of Luenberger Observers. The system is intended for use in a dual or triple redundant environment, and takes maximal advantage of all existing functional and dynamic relationships among the variables sensed by dissimilar sensors. In this paper a brief discussion on the use of Luenberger Observers as a means for the attainment of analytic redundancy is provided. The structure and parameters of the failed sensor signal-reconstructor is developed. Flight test data of the Lockheed L-1011 aircraft are exhibited.