I think there are lots of things that can fail in the hardware: electrical noise (standard stuff), radiation, metastability, etc. It's not just a bad speed signal... it's a valid speed signal but the software reading inconsistent states based on these errors, or having values change when they shouldn't, etc.
NASA's Orion Flight Software Production Systems Manager Darrel G. Raines joins Planet Analog Editor Steve Taranovich and Embedded.com Editor Max Maxfield to talk about embedded flight software used in Orion Spacecraft, part of NASA's Mars mission. Live radio show and live chat. Get your questions ready.
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