Abstract: In the space environment,the electrical circuses of computer are often subject to hardware transient faults,which are caused by high energy neutrons from cosmic rays.It is necessary to utilize appropriate fault tolerance techniques for improving the reliability of space application.This paper proposed an enhanced algorithm based on RSCFC(Relationship Signatures for Control Flow Checking),which is a control flow checking approach for hardware transient faults.In RSCFC,the sum of basic blocks is limited by the length of machine word.Through the segmented encoding of signatures,the optimized method solves the problem effectively.The analytical results indicate that the maximal number of basic blocks is extended to 2¹⁸ when the length of machine word is 64 bits.Compared with RSCFC,the overhead of performance and memory is decreased evidently in our algorithm,and the faults detecting capability remains.

Key words: Transient faults,Software signatures,Control flow checking,Software tolerance