Multi-user quantum time synchronization method and system based on time division multiplexing

Abstract

The invention discloses a multi-user quantum time synchronization method and system based on time division multiplexing. The method comprises the steps of enabling a time frequency source to output areference frequency signal and a reference time signal; enabling the optical fiber frequency transmission transmitter to receive the reference frequency signal and transmit the reference frequency signal to n clients, wherein n is a positive integer greater than or equal to 2; receiving a reference time signal through a quantum bidirectional comparison automatic switching module of the transmitting end, transmitting the reference time signal to n user ends, and obtaining a clock difference t0i between the user end i and a time frequency source through a quantum bidirectional time comparison mode; enabling an operation control unit i of the user side i to adjust the adjustment amount of the programmable delayer i to be t0i according to the clock difference t0i; inputting a frequency signali obtained by the user side i into the frequency divider i to obtain a time signal i; and inputting the time signal i into a programmable delayer i for delay processing to obtain an output time signali of the user side i. According to the invention, multi-user quantum time synchronization can be realized, and high precision and high reliability of time synchronization can be ensured.

Description

technical field [0001] The invention belongs to the technical field of time and frequency, relates to a multi-site quantum time synchronization method, in particular to a multi-user quantum time synchronization method and system based on time division multiplexing. Background technique [0002] In fields such as aerospace, radar synchronization, cutting-edge weapon control, high-speed communication, and deep space exploration, high requirements are placed on time synchronization. The current long-wave timing can only achieve synchronization accuracy of microseconds, satellite common viewing can only achieve synchronization accuracy of nanosecond level, and the optical fiber time synchronization method and satellite two-way comparison method can only achieve synchronization accuracy of hundreds of picoseconds. Quantum time synchronization technology can improve time synchronization accuracy to sub-picosecond or even femtosecond level, so quantum time synchronization method ha...

AI Technical Summary

Problems solved by technology

At present, most of the time synchronization schemes are cascaded multi-sites, which require a large amount of time synchronization and calibration equipment; they are transmitted through receiving stations along the way, and errors will be introduced during the cascade transmission process; multi-level cascades will also have errors accumulation, reducing the accuracy and stability of the transmitted time signal

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