National standard time remote recurrence method

Abstract

The invention provides a method for long-distance reappearance of the national standard time. First, calculate the star station clock difference between the reference station and each visible satellite and each user station and each visible satellite, and calculate the star station clock difference. According to the final fitting result, each user station will make a corresponding difference with the star station clock error of the visible satellite common to the reference station, and each user station will respectively remove the gross error The mean value of the difference data is taken as the time difference between the reference time of each user station and the national standard time of the base station; the time difference value is returned to each user station correspondingly, thereby controlling the output of the local atomic clock to synchronize it with the national standard time. The invention can make up for the lack of 1-5ns real-time timing precision in the current timing system, and provide real-time and continuous real-time timing with 2ns precision.

Description

technical field [0001] The invention belongs to the technical field of satellite timing, and relates to a method for remote time reappearance. Background technique [0002] The National Time Service Center undertakes the generation, maintenance and broadcasting tasks of my country's standard time. Its timekeeping system is an indispensable basic project and social public welfare facility for the country. It has established a national standard time UTC (NTSC) synchronized with UTC for my country. In addition, the National Time Service Center is also providing the established national standard time UTC (NTSC) to users from all walks of life through diversified means to serve the development of my country's national economy. [0003] At present, the National Time Service Center has established the following time service methods for users with different time and frequency accuracy requirements, and their main performance indicators are shown in Table 1. [0004] Table 1. Accurac...

AI Technical Summary

Problems solved by technology

For example, in the range of 1ns to 10ns, the one-way timing accuracy of the satellite navigation system cannot meet the needs of users, while the performance of methods such as satellite common viewing, satellite two-way comparison, and optical fiber time-frequency transmission can meet the requirements, but they are only suitable for point-to-point comparisons. demand, and the cost is much higher than that of one-way time service and other methods. In addition, the generation of satellite common-view and satellite two-way comparison results lags behind, which also restricts the needs of some users. Therefore, a cost-effective and widely used method is needed. To meet the needs of users with precision below 10ns

At the same time, there are two problems with the satellite common view method: one is that the complete observation period is 16 minutes, and there are only 13 minutes of observation data, and there is a 3-minute observation gap, which does not meet the requirements of traceability; The result generation lags behind and does not meet the real-time requirements

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