Common view principle-based unilateral time transmission method

Abstract

The invention relates to a common view principle-based unilateral time transmission method. The method is characterized in that the common view principle and a virtual reference station principle are applied to the time transmission of a forwarding satellite navigation system, wherein the main reason for influencing the time transmission accuracy is ephemeris error and ionospheric additional time delay correction error when the tropospheric refraction time delay correction is performed at a client; and the ionospheric error and the ephemeris error are corrected by using virtual reference station technology and common view technology so as to realize the time transmission accuracy of 2ns. The invention provides the common view principle-based unilateral time transmission method, which can improve the time transmission method, improve the time transmission accuracy and provide time synchronization required for synchronously and precisely measuring the synchronization between ground stations of the satellite navigation system, between rail system external field stations and between time keeping laboratories.

Description

technical field [0001] The invention relates to a timing method, in particular to a one-way timing method based on the common-view principle. Background technique [0002] Time is currently the physical quantity with the highest precision. A significant metrological feature of time is that it can directly transmit national standards, and time service is an important part of it. Time service is to transmit the local time (generally the national standard time) through certain means, and adopt the broadcast method for multiple users. The number of users in the time service system is not limited. It is very important that all users are synchronized with the time of the time service master station. time transfer method. [0003] The current timing methods can be divided into land-based and satellite-based. The land-based timing methods mainly include short-wave timing, low-frequency time code timing, and long-wave timing. The transmitter station is on the ground, generally cover...

AI Technical Summary

Problems solved by technology

[0005] Precision time applications are based on atomic clocks and time service. At present, the second-level stability of atomic clocks has exceeded 1E-12, but the highest accuracy of the time service system is only on the order of 10 ns, which is far behind the accuracy of atomic clocks. There is an urgent need for current The timing method is improved

There are many occasions, such as synchronization between ground stations of satellite navigation system, precise orbit determination system, synchronization between time-keeping laboratories, etc., all need time synchronization better than 2ns, but because the timing accuracy cannot meet the needs, these applications use GNSS common view and satellite two-way time transfer technology, these methods increase the cost and burden of users, and can only achieve synchronization between several users, and the scalability is insufficient

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