Redundancy Management in Strapdown Navigation Systems

C. R. Giardina, E. G. Luxford

Abstract:	Redundancy in strapdown navigation systems provides the high probability of success and increased reliability necessary for completing complex military aircraft missions. When redundancy is utilized, however, careful consideration must be applied to failure detection techniques, isolation of faults, and subsequent reconfiguration (redundancy management). Costly configurations involving more than the minimum number of components will result if the correct redundancy management approach is not applied. In this paper, a system design is described which is believed to achieve the maximum probability of mission success with minimum number of components. Specifically, software methods are used to enhance system hardware Built- In- Test (BIT) so failure detection capability is increased for initial system failures well beyond the usual 95% hardware capability. Reconfiguration methods to preserve the navigation function through several failures are also described. Probability differential equations and "fail/op" flow charts are provided, illustrating coverage on continuation of the navigation function through several component failures. Sensitivity to MTBF and fault detection capability in computing mission probability of success are presented. The design also provides methods of cross strapping component data when strapdown sensor blocks are mounted on vibration isolators and motion of one block relative to the other exists in an aircraft vibration environment.
Published in:	Proceedings of the 1984 National Technical Meeting of The Institute of Navigation January 17 - 19, 1984 San Diego, CA
Pages:	24 - 28
Cite this article:	Giardina, C. R., Luxford, E. G., "Redundancy Management in Strapdown Navigation Systems," Proceedings of the 1984 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 1984, pp. 24-28.
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