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FauIt-ToIerance Oriented ReaI-Time Task ScheduIing on MuItipIe Earth-Observing SateIIites
Pages: 1471-1480
Year: Issue:  8
Journal: Acta Electronica Sinica

Keyword:  earth-observationsatellitefault-toleranceschedulingprimary copy/backup copyoverlappingmerging;
Abstract: This paper presents a novel dynamic fault-tolerant scheduling model for real-time tasks on multiple observation satellites.In this model,the primary/backup policy is employed to tolerate one satellite’s permanent failure at one time instant.On the basis of the fault-tolerant model,we propose a novel fault-tolerant satellite scheduling algorithm called FTSS.To improve the re-source utilization,the overlapping technology is adopted.According to the satellite feature with time windows,we analyze the over-lapping mechanism on satellites and combine them into FTSS.In addition,the FTSS employs the task merging strategies that are used to decrease the task count needed to execute and thus further enhance the schedulability.To demonstrate the superiority of our FTSS,we conduct simulation experiments to compare FTSS with three baseline algorithms.The experimental results indicate that FTSS efficiently improves the scheduling quality of others and is suitable for satellite fault-tolerant scheduling.
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