Abstract
In this paper some decision strategies for the combination of the outputs of a number of redundant analogue subsystems are studied. The intention is thereby to combine the redundant outputs in such a way that the resulting output is insensitive to the drift and noise failures that occur in the subsystems. Majority voting is a stochastic concept. It is based upon an estimator for the absolute maximum of the density function of the errors in the subsystem outputs. Similarity voting is a deterministic concept, whereby the subsystem output differences are compared to a tolerance reference. The outputs exceeding the tolerance limits with respect to the remaining outputs are considered to be dissimilar and the other outputs to be similar. A similarity voter establishes a weighted mean of the similar outputs only. The effectiveness of the various strategies against noise and drift failures is determined with the help of Monte Carlo simulations.
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