Dual-Sensor Failure Identification Using Analytic Redundancy
Mukund N. Desai, J. C. Deckert, John J. Deyst · Journal of Guidance and Control · 1979
In this paper we present a reliable technique for failure detection and identification for dual flight control sensors aboard the F-8 digital fly-by-wire aircraft, and we discuss the successful application of the technique to identifying failures injected on test flight downlink data. The technique exploits the analytic redundancy which exists as relationships among variables being measured by dissimilar instruments, and it accommodates both modeling errors and the allowable errors on unfailed instruments. With straightforward modification the technique may be extended to provide failure monitoring of a single remaining sensor after the identified failure of its companion sensor. Nomenclature = SPRT failure threshold ( 0) = DG case orientation angle