š§āš How NASA Built Artemis IIās Fault-Tolerant Computer ā Communications of the ACM
ļ½¢ Orion carries a completely independent Backup Flight Software (BFS) system. This is a prime example of dissimilar redundancy. It is implemented on different hardware, runs a different operating system, and utilizes independently developed, simplified flight software ļ½£
https://cacm.acm.org/news/how-nasa-built-artemis-iis-fault-tolerant-computer/
āA faulty computer will fail silent, rather than transmit the āwrong answer,āā Uitenbroek explained. This approach simplifies the complex task of the triplex āvotingā mechanism that compares results. Instead of comparing three answers to find a majority, the system uses a priority-ordered source selection algorithm among healthy channels that havenāt failed-silent. It picks the output from the first available FCM in the priority listā
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Stephen Bannasch (316 ppm)
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