Method for improving satellite time synchronism pulse keeping performance

A time synchronization, satellite technology, applied in the direction of automatic power control, radio transmission system, electrical components, etc., can solve the phase deviation between the 1PPS signal and the satellite 1PPS signal without controlling from the source, and the large phase deviation between the 1PPS signal and the satellite 1PPS signal , satellite time synchronization pulse low performance and other issues, to achieve low cost, easy to implement, increase the effect of holding time

Inactive Publication Date: 2007-02-07
HUAWEI TECH CO LTD
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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 t

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  • Method for improving satellite time synchronism pulse keeping performance
  • Method for improving satellite time synchronism pulse keeping performance
  • Method for improving satellite time synchronism pulse keeping performance

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[0042] In order to make the technical problems, technical solutions, and advantages to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0043] The present invention is a method for improving the performance of satellite time synchronization pulse retention. Its basic idea is to use the characteristic of fixed output frequency of constant temperature crystal oscillator in a short time, aiming at figure 1 A small number of software algorithms are added to the hardware in the frequency divider to solve the problem of phase difference accumulation between local 1PPS and satellite 1PPS from the source through the modulus correction technology of the frequency divider, reduce the rate of phase difference increase, and reduce the unit time under the same phase difference tolerance Increase the number of local 1PPS phase correction times and increase the local 1PPS ho...

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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...

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Application Information

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IPC IPC(8): H04B7/185
CPCH04B7/2125H03L7/00
Inventor 马全红张孝铁
Owner HUAWEI TECH CO LTD
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