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Improvement in the Reliability of a Bi-Processing Unit Satellite Subject to Radiation-Induced Bit-Flips
Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, Department of Electronics and Telecommunications.
2014 (English)MasteroppgaveStudent thesis
Abstract [en]

The design of reliable spacecrafts is a challenging task because of the harsh constraints imposed by the outer space environment. One major cause of failure of part or totality of the system lies in the space radiations which affect the embedded electronic components, such as the introduction of bit-flips in the memory devices. The work accomplished in this thesis attempts to improve the reliability of NUTS (NTNU - Test Satellite). The focus has been set on the research of software techniques leveraging the hardware architecture available in order to achieve tolerance against radiation-induced bit-flips. A study of the effect of bit-flips in both data and program memory has led to the establishment of a stack of techniques aiming at increasing the reliability of the system in a radiated environment. These techniques consist of the use of watchdogs, the corruption detection and correction of the program memory, the recourse of a JTAG channel to reprogram a deficient processing unit, and the takeover of the whole system by one processing unit in the event of a permanent failure of the second one. Each technique has been thoroughly tested individually in the presence of bit-flip injection. Additionally, a test of the whole protective stack showed very positive results since the system has been able to run successfully for more than 8 hours sustaining a bit-flip density 250 times higher than the expected on-orbit rate.

Place, publisher, year, edition, pages
Institutt for elektronikk og telekommunikasjon , 2014. , 110 p.
URN: urn:nbn:no:ntnu:diva-26483Local ID: ntnudaim:11553OAI: diva2:747984
Available from: 2014-09-17 Created: 2014-09-17 Last updated: 2014-09-17Bibliographically approved

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