Validation of a fault-tolerant clock synchronization system
Ricky W. Butler, Sally C. Johnson, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1984 - Technology & Engineering - 19 pages
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actual skew AIRLAB Aqp(T calculated chronization clock synchronization algorithm clock synchronization system clock value clocks q communication delay defined design assumptions design proof determined distribution function E(eqp E(Xqp experimental data failure mode Fault Tolerance SIFT fault-tolerant clock synchronization fault-tolerant system Figure flight-crucial Gini statistic histogram LAMBDA LAMBDA distribution Langley Research Center large quantiles Lemma limiting distribution maximum clock skew maximum drift rate maximum likelihood measured ments mission of length msec NASA nonfaulty normalized spacings number of clock obtained order statistics Prob(max(pi probability of failure processor failure processor p i.e. processor's clock pulse q's clock random sample random variable read another processor's read error regression analysis reliability analysis select algorithm SIFT synchronization single clock read specific processor SRI International subsystem synchronization period synchronization task system parameters system reliability require testing theorem tion trade-off underlying distribution upper bound validation method Validation Step