Analysis and research on the accuracy of optical fiber two-way time synchronization signal based on spread spectrum code ranging

To solve the problem of time synchronization between two stations in an optical two-way time synchronization system, an optical time synchronization scheme based on spread spectrum code ranging is presented. Time difference between sites is measured by spread spectrum code ranging, and link delay is eliminated by two-way method to achieve time synchronization between two sites. The accuracy of time synchronization between stations is affected by the accuracy of time difference measurement. By analyzing the structure and measurement principle of receiver code tracking loop, it is found that the accuracy of time difference measurement is mainly related to the signal system, carrier-noise ratio and receiver parameter settings. The carrier-noise ratio of links and receiver parameter conditions are determined. Through the analysis of different signal systems time difference accuracy, the signal system that can meet the requirements of highprecision time synchronization is selected.