A digital clock synchronization method and device for a satellite communication terminal

Abstract

The invention discloses a satellite communication terminal digital clock synchronization method and device; the method comprises the following steps: calculating frequency difference between a masterstation clock and a terminal digital clock according to time information continuously sent by a master station within a set time interval; calculating a frequency adjustment value by utilizing a frequency adjustment algorithm according to the frequency difference, and controlling the output frequency of the digital clock of the terminal according to the frequency adjustment value so as to achievefrequency synchronization with the master station clock; adding the obtained latest master station clock and set link delay to obtain master station time and loading the time to local time so as to realize time synchronization of the local time and the main station clock; the device comprises a main station time obtaining module, an adjusting control module, a digital frequency conversion module and a loading control module. According to the method and the device, the convergence rate, the precision and the robustness of time synchronization are greatly improved, the structure is simple and easy to be implemented, and the purpose of synchronization of the main station clock and the local clock can be rapidly achieved.

Description

technical field [0001] The invention belongs to the technical field of communication signal processing, and relates to a digital clock synchronization method and device for a satellite communication terminal. Background technique [0002] With the expansion of market demand, the satellite communication industry is developing rapidly, and the number of users is increasing day by day. In order to make full use of the transponder bandwidth resources on the communication satellite, the TDMA system is adopted by many mainstream satellite communication protocols. The core of the TDMA system is the clock synchronization between each terminal and the main station. The quality of clock synchronization affects the bandwidth utilization of the system to a large extent. Clock synchronization includes two aspects - clock frequency synchronization and time synchronization. [0003] Due to the wide distribution of satellite communication terminals and large changes in temperature, latit...

AI Technical Summary

Problems solved by technology

This greatly wastes precious satellite bandwidth resources, and the stability is not high, especially when the terminal logs in for the first time, since the master station does not obtain any time deviation, a large protection interval and adjustment time are required

Or use a high-precision crystal oscillator or GPS clock synchronization module on the hardware to provide a high-precision clock for the terminal, but this increases the cost of the terminal

Images