Pseudo-range-assisted-carrier-phase-based beidou common-view time transmission method

Abstract

The invention, which belongs to the technical field of high-precision time synchronization, particularly relates to a pseudo-range-assisted-carrier-phase-based beidou common-view time transmission method. The method comprises: users at two places obtain pseudo range and carrier phase observation data and broadcast messages by a beidou receiver and data exchanging is carried out by an internent network; a pseudo-code ranging common-view clock difference and a carrier wave common-view clock difference are calculated respectively by using a beidou common-view algorithm; and then a real-time clock difference of the two places is obtained based on least square fitting and vondrak filtering. According to the method, no cycle-slip detection and ambiguity resolution are carried out; and thus compared with the existing common view algorithm with the pure carrier phase, the provided method is simple and real-time in-station clock difference resolution at the sub-ns order can be realized.

Description

technical field [0001] The invention belongs to the technical field of high-precision time synchronization, and in particular relates to a method for Beidou common-view time transfer based on pseudorange-assisted carrier phase. Background technique [0002] High-precision time has become an indispensable condition for the development of modern technology. Precision time plays a fundamental role in national economy and national defense construction, and has become an important strategic parameter and resource of the country. With the development of science and technology, the application range of high-precision time and frequency is becoming more and more extensive, from basic electric power, telecommunications, financial securities, to various engineering technologies, to modern space high-tech fields and other aspects. Especially for time-based measurement, a satellite navigation system that realizes distance, position and speed determination requires a high stable frequenc...

AI Technical Summary

Problems solved by technology

[0006] Disadvantages: only suitable for short baselines for time transfer, the time transfer accuracy is low, the accuracy is 5-8ns

[0009] Disadvantages: time comparison based on pseudo-range, the accuracy improvement is not obvious, and IGS post-correction is required, and time comparison cannot be performed in real time

[0012] Disadvantages: precise ephemeris and precise clock difference files are required, time comparison cannot be performed in real time, and phase ambiguity needs to be resolved, and the algorithm is complex

[0015] Disadvantages: satellites need to be rented, the link is complicated, and the user construction cost is high

[0018] Disadvantages: Phase ambiguity and cycle slip detection need to be resolved, ambiguity resolution and cycle slip detection algorithms are complex, and the accuracy of the solution directly affects the accuracy of time comparison

[0019] The methods of remote high-precision time comparison have their own advantages and disadvantages, and are suitable for different occasions. Some comparison methods have high precision, but are not suitable for real-time comparison. The comparison facilities or comparison algorithms are more complicated. Some comparison methods The equipment is simple and can perform real-time time comparison, but the accuracy of time transfer is low

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