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The Soil Moisture Acttive Passive Mission: fault protection performance and lessons learned

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dc.contributor.author Juneau Clark, Jessica
dc.contributor.author Meakin, Peter
dc.date.accessioned 2019-05-01T17:26:23Z
dc.date.available 2019-05-01T17:26:23Z
dc.date.issued 2016-03-05
dc.identifier.citation IEEE Aerospace Conference, Big Sky, Montana, March 5-12, 2016 en_US
dc.identifier.clearanceno 16-0107
dc.identifier.uri http://hdl.handle.net/2014/46023
dc.description.abstract Fault protection as a discipline involves a collection of flight software logic and operational processes for detecting unacceptable anomalous behavior, responding prior to reaching criticality, restricting the propagation of a failure beyond a fault containment region, and recovering the vehicle back to full or degraded functionality if possible. The System Fault Protection (SFP) design for the SMAP Earth orbiter was put to the test during its 90-day vehicle commissioning activities. During this time, the SFP software autonomously protected the vehicle from multiple faults to critical hardware, and the operations team successfully returned the observatory to its science state. The SFP also performed well in the presence of anomalous behavior below true safety limits by not taking unnecessary response actions, instead allowing the operations team time to monitor the behavior. Certain aspects of the SFP design were modified during operations via both parameter updates and a full flight software update in order to better match the vehicle behavior in the flight environment. An evaluation of the SMAP SFP performance during vehicle Commissioning will be provided in this paper, as well as a set of lessons learned largely focused on visibility, SFP mutability in operations, responses to peripheral device faults, and Safe Mode recovery and design. By capturing some of the knowledge gained during SMAP Commissioning, it is intended that this paper provide guidance for making future System Fault Protection designs more robust and supportive of operations. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA: Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2016 en_US
dc.title The Soil Moisture Acttive Passive Mission: fault protection performance and lessons learned en_US
dc.type Preprint en_US


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