基于GPS的时钟同步模型选择与实验分析

Test and choice of clock synchronization model based on GPS

由于GPS已经成为高精度时间传递的有效便捷手段,基于GPS的时钟同步技术在许多计算机自动控制领域内具有重要应用。本文介绍了计算机内部高精度时钟与GPS进行时间同步的原理,建立了时钟同步一阶和二阶数学模型;采集实测数据进行了实验分析,结果表明一阶模型比二阶模型精度高,且稳定;对影响时钟同步结果精度的几个参数进行了实验分析;最后对时钟同步的外推精度进行了分析,结果表明,在剔除原始数据粗差后一小时内采用加权平均的方法可以得到50μs的同步精度。

Since GPS has been an effective and convenient means to transfer precise time,clock synchronization technique based on GPS is more popular and important than ever before in many auto-control fields with computers.The theory of clock synchronization between GPS and high-precision clock built in computers was introduced in this paper,then first-order and second-order mathematical model of clock synchronization were given.The analysis results of the tests with real raw data showed that first-order model has advantage over second-order model in precision and stabilization.Several parameters correlated with the precision of clock synchronization results were analyzed with tests.Lastly,the precision of the extrapolation synchronization was analyzed and results showed that after eliminating the spikes of the raw data,the weighted-mean method could obtain a synchronization precision of 50 microseconds in an hour.