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- W139023165 abstract "Fault-tolerant On-Board Computer (OBC) software for the Delfi-n3Xt nanosatellite is needed in order to minimize the risk of failures that may occur while the satellite is operating in space. Failures may be OBC specific, but failures that affect the state of the entire satellite and influence the health of the data bus may occur as well. Some failures that may occur on the I2C data bus can have a very large impact on the health of the satellite. The failure cases in which the I2C data line or I2C clock line is being pulled low for a longer period of time make communication over the I2C bus impossible. The I2C bus recovery mode that is implemented in the OBC, together with the I2C recovery mechanism that applies to the whole satellite, provides a way to resolve failure cases like these. The failure cases on the I2C bus with less disastrous impacts may result in data inconsistencies and time-outs and are handled by the OBC as well. The I2C data bus performance analysis for Delfi-n3Xt shows a bit error rate of at most 4E-9, which fulfills the requirement that specifies that the bit error rate must be 1E-6 or less. Apart from failures on the I2C data bus, failures may occur internally in the OBC hardware or software. Since the OBC controls the whole satellite, a permanent failure in the OBC hardware or software may result in a non-functional satellite. The OBC software is designed and implemented in such a way that it can not become in an undefined state for longer than 8 seconds. Besides that, the OBC assures that transfers over the I2C bus never take longer than 30ms. This improves reliablity and performance. Furthermore, clever routines that save flash memory erase cycles were designed and developed in order to increase the lifetime of the flash memory." @default.
- W139023165 created "2016-06-24" @default.
- W139023165 creator A5082120562 @default.
- W139023165 date "2012-08-28" @default.
- W139023165 modified "2023-09-28" @default.
- W139023165 title "Fault-Tolerant On-Board Computer Software for the Delfi-n3Xt Nanosatellite" @default.
- W139023165 hasPublicationYear "2012" @default.
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