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This paper presents the extended dynamic fault tree (eDFT) model for fault-tolerant Onboard Data Handling (OBDH) software used in microsatellite. For high reliability, in case of the primary processor failure, hot/warm spare automatically and uninterruptedly start torun the OBDH software without critical data missing. Memory with triple-modular redundancy and communication bus with spare are frequently employed in OBDH subsytem design. The important feature of OBDH software which is differentdoi:10.21311/002.31.5.23 fatcat:4r5b2bhvzvacnchybuk25leo2m