High Precision Clock Synchronization and Control Based on GPS

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. The theory of clock synchronization between GPS and high-precision clock built in computers is introduced in this paper; then the first-order and second-order mathematical model of clock synchronization are proposed. The results of the test with real raw data show that the first-order model has advantage over the second-order model in terms of precision and stabilization. Also, several condition parameters correlated with the clock synchronization results are analyzed with tests. An algorithm used to correct the spikes of the time-stamp data was implemented, which had been proved to be able to find and correct the spikes effectively, so it can improve the synchronization in terms of precision to some extent. In order to mitigate the errors accumulating with time, a weighted average method with the results generated by early-processed parameters and later-processed ones is given, which can obtain obvious improvement to a large extent in terms of precision.