Fiber time and frequency transfer method, device and system based on bidirectional spread spectrum ranging

Abstract

The invention provides a fiber time and frequency transfer method, device and system based on bidirectional spread spectrum ranging for solving the problems of time and frequency signal transfer and synchronization in a remote fiber system of a large ground station. The system comprises a transfer front-end node, a receiving terminal node and a fiber transfer link connected between the transfer front-end node and the receiving terminal node; the transfer front-end node and the receiving terminal node have the same composition structure, and each of the transfer front-end node and the receiving terminal node comprises a bidirectional time comparison module, a spread spectrum transmitting module, a spread spectrum code generation module, a spread spectrum receiving module, two analog electrical to optical converters, two analog photoelectric transducers, a wavelength division multiplexer, a frequency recovery module and a time generation and synchronization module. Fiber cable transfer and spread spectrum pseudo code measurement technologies are adopted, and the carrier-to-noise ratio is higher when the fiber transfers a signal, so that the ranging accuracy is improved while the additional comparison of the data transfer link is avoided.

Description

technical field [0001] The present invention relates to the field of time-frequency measurement and control, in particular to the time synchronization technology of the distributed networking system of large-scale ground stations, especially in the field of high-precision time synchronization technology, a method and device for optical fiber time-frequency transmission based on two-way spread spectrum ranging are proposed and system. Background technique [0002] When transmitting time-frequency signals between distributed networked computer rooms of large ground stations (such as satellite navigation systems, mobile communication systems, etc.), it is very important to realize long-distance high-fidelity time-frequency signal transmission between the front-end node and the receiving terminal node. Yes, it requires the time-frequency signal transmitted to the receiving terminal node to achieve impedance matching, lower amplitude loss, less noise insertion loss, and higher ti...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to address some difficulties faced by the traditional two-way time comparison method in the above-mentioned optical fiber time-frequency signal transmission, and propose a method, device and system for optical fiber time-frequency transmission based on two-way spread spectrum ranging to solve the problem of large-scale ground stations. Problems of Time Frequency Signal Transmission and Synchronization in Optical Fiber Remote System

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