A GNSS-based base station network time synchronization method

Abstract

The invention provides a GNSS (Global Navigation Satellite System)-based base station networking time synchronization method, which can realize time synchronization with large coverage and high synchronization precision. Compared with the traditional RTK-based time synchronization method, the GNSS-based base station networking time synchronization method provided by the invention has the advantages that nanosecond-level precise time synchronization of each station in any 20km area can be realized without constructing a reference station, and the GNSS-based base station networking time synchronization method has the characteristic of no central station and is high in survivability. According to the GNSS-based base station networking time synchronization method provided by the invention, theinformation interaction mode of each station networking and data interaction is adopted; high-precision time synchronization of regional stations with common-view satellite conditions can be kept; and for areas without the same observation satellites or areas with only a part of the same observation satellites, high-precision time synchronization can be realized, so that high-precision synchronization between adjacent stations is realized, and continuous coverage of the whole network is realized.

Description

technical field [0001] The invention belongs to the technical field of time synchronization, and in particular relates to a GNSS-based base station networking time synchronization method. Background technique [0002] In many technical fields at present, high-precision time synchronization is required (the time synchronization accuracy of two base stations within 10 kilometers is less than or equal to 3 ns), such as power network, mobile communication network and other systems, which cover a large area and often require global Realize time synchronization in the region. At the same time, in these systems, the synchronization accuracy between adjacent stations is very critical. For example, in order for the base stations of the mobile communication network to realize functions such as multi-base station coordination and IoT positioning, it is required that the time synchronization accuracy between base stations with overlapping mobile network signals be better than 10 nanose...

AI Technical Summary

Problems solved by technology

Satellite common-view technology can achieve wide-area coverage, but it has high requirements for base station hardware facilities. Generally, atomic clocks must be arranged at the site, which is costly; the principle of time synchronization network implemented by RTK is mainly based on the central station’s error in the transmission path of navigation signals. And satellite-related error correction, its coverage is local, and the cost of establishing a central station is often high; inter-station time synchronization based on PPP technology has a large coverage and high accuracy, but it needs to rely on third-party Enhanced data, high operating costs, uncontrolled reliability

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