Method for improving satellite time synchronism pulse keeping performance

Abstract

The invention relates to a method for improving the synchronous impulse keep property of planet, wherein it comprises: CPU sets the phase difference correct threshold value and the correct threshold value of phase difference change speed; based on the phase-difference correct threshold value, adjusting the phase of local second impulse; CPU records and stores the phase differences between one group of local second impulse and planet second impulse in FIFO; CPU calculates the phase difference change average speed of local and planet second impulses; CPU judges if the average speed is higher or equal to the correct threshold value of phase difference change speed; if it, executing next step; or else, feeding back to the first two steps; CPU based on the average speed, adjusts the mode of frequency divider. The invention can reduce the phase difference increase speed, and reduce the phase difference correct times of local IPPS, to improve the kept time of local 1PPS.

Description

Technical field [0001] The present invention relates to satellite timing technology in the field of wireless communication, in particular to a method for improving the performance of satellite time synchronization pulse retention. Background technique [0002] Satellite navigation systems that are currently widely used are: Global Positioning System (GPS), Global Navigation Satellite System (GLONASS) and Beidou Navigation System. They all use navigation satellites for time and distance measurement, and can perform omnidirectional real-time three-dimensional navigation and positioning in sea, land, and air. Because of their high accuracy, all-weather, and wide coverage, satellite navigation systems play a very important role in precision navigation, command and dispatch. [0003] Specifically, the main purpose of satellite navigation systems is navigation positioning and timing. As long as users equipped with satellite receivers can receive signals from space satellites in all wea...

AI Technical Summary

Problems solved by technology

[0008] After the above scheme is corrected by the phase of the frequency divider, although the local 1PPS can be aligned with the satellite 1PPS signal to a certain extent, the phase deviation between the local 1PPS signal and the satellite 1PPS signal per unit time of the above scheme is relatively large, which is only in the local When the phase deviation between the 1PPS signal and the satellite 1PPS signal is too large to the preset phase correction threshold, the local 1PPS signal is forced to be corrected so that the local 1PPS signal and the satellite 1PPS signal are in phase, and the local 1PPS is not controlled from the source The phase deviation between the signal and the satellite 1PPS signal

It can be seen that the performance of the above scheme for maintaining the satellite time synchronization pulse is still low

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