面向成本优化的高准度时间服务系统研究与实现

Research and implementation of time service system for cost optimization

由于NTP授时方案具有网络收发路径不对称特性,导致该方案时间同步精准度不高。提出了以STM32H750和NEO-M8N为载体构建精准性及低成本的时间同步系统,为证券期货金融产品程序化交易系统提供普适的时间服务。首先,剖析网络时间同步原理、电路构造、定时器复位模式基本原理;然后,综合NEO-M8N输出的UTC时间参数以及1PPS脉冲信号驱动下的定时器计数信息,实现秒级粗粒度和微秒级细粒度的时间测量;最后,建立嵌入式NTP服务器为网络内客户端提供高准度的时间服务。测试结果表明,提出的时间服务系统时间偏差不大于80μs,相对于现存的基于远端NTP时间服务器授时方案高至5.1ms时间偏差,更具精准性和可靠性。

Due to the asymmetry of the sending and receiving paths on the internet,the accuracy of the timing synchronization based on the NTP is not high.Proposing a low-cost and high-precision time service system,which based on STM32H750and NEO-M8N,is proposed to provide universal time service for the securities trading financial program trading system.Firstly,the time synchronization,circuit system and reset mode of timer are analyzed.Then,the UTC time parameters and 1PPS pulse signal output by NEO-M8Nand a timer are used to achieve second-level coarse-grained and microsecond-level fine-grained time measurement.Finally,an NTP server which provides clients with high-precision time services is proposed.The experimental results show that the time deviation of the proposed time service system is not more than 80μs,while the time deviation of the existing time service scheme based on a remote NTP time server is as high as 5.1ms.Therefore,the proposed time service system has higher accuracy and reliability than that of NTP time service scheme.