频率漂移对PTPV2链路延迟计算精度的影响与分析

Affect And Analysis of Clock Frequency Drift on Line Delay Computation Of PTPV2

针对基于PTPV2的网络化测试系统中,时钟频率漂移对链路延迟的影响问题,分析了IEEE1588时间同步过程的原理和拓扑结构图,给出了点对点PTP系统中影响同步性能的机理;在此基础上,通过引入频率变化率补偿因子CRF,获得了链路延时误差计算模型;结果表明,均衡提高主从时钟频率稳定度可改善系统同步精度,合理选择报文传递参数可减少时延计算误差。

Deal with the question that the propagation delay variations caused by the frequency drift in PTPV2 networked test system, this paper analysis the time synchronism principium and the network topological structure of IEEE1588. The factors that affect the synchronization performance in peer--to-- peer precision time protocol （PTP） were investigated. On the base of the research, by draw into the CRF, the line delay estimation error model is obtained. The result shows that equally enhance master and slave clock frequency stability, system synchronization accuracy can be improved. Rational selection messages transmitted interval, line delay computation error can be decreased.