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分析城市轨道交通安全信息传输中常用的循环冗余校验(CRC)的编码和检纠错原理。提出单个比特错误、两个比特错误、奇数个比特错误和并发错误四种情况下选择多项式的原则。在此基础上给出详细的软件算法与软件实现。以减少运算量来达到减小处理时间的目的。
This paper analyzes the principles of encoding and checking and correcting error of Cyclic Redundancy Check (CRC) commonly used in urban rail transit safety information transmission. The principle of selecting polynomials in four cases is proposed: single bit error, two bit errors, odd number of bit errors and concurrency errors. On this basis, detailed software algorithms and software implementation are given. To reduce the amount of computation to achieve the purpose of reducing processing time.