Method and system for clock synchronization based on multi-base station positioning

A technology for clock synchronization and cross-checking, applied in synchronization devices, wireless communications, electrical components, etc., can solve the problems of high cost of hard clocks, inability to eliminate central frequency errors, poor flexibility, etc., to expand or reduce system size, correct Data error, the effect of easy modification

Active Publication Date: 2021-04-06
SOUTHEAST UNIV
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  • Abstract
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Problems solved by technology

However, due to the high cost and poor flexibility of hard clock synchronization, and the error in the transmission process of the central frequency cannot be eliminated

Method used

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  • Method and system for clock synchronization based on multi-base station positioning
  • Method and system for clock synchronization based on multi-base station positioning
  • Method and system for clock synchronization based on multi-base station positioning

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Embodiment Construction

[0047] Hereinafter, the embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0048] The basic idea of ​​the present invention is to ensure the normal communication by designing the working sequence, design the communication protocol to ensure the data transmission, design the clock synchronization equation between the base stations to obtain the synchronization parameters, use the synchronization parameter design scheme to correct the positioning data, and eliminate the positioning deviation caused by the asynchronous clock .

[0049] Specifically, in the present invention, the working cycle sequence design is as follows:

[0050] as attached figure 1 As shown, a complete duty cycle includes three communication task types: activation signal, positioning signal and feedback signal. The activation signal marks the beginning of a new working cycle, each slave base station waits for the positioning signal after receiving...

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Abstract

The invention discloses a multi-base station positioning-based cross-check clock synchronization method and system. In the multi-base station positioning system, a master base station and multiple slave base stations are used to perform multi-base station positioning for users. In the method of the present invention, the master base station performs work sequence control to ensure normal communication, and at the same time acquires the time stamps of sending and receiving between base stations for clock synchronization, constructs equations based on multiple sets of sending and receiving time stamp information to obtain synchronization parameters, and corrects the positioning data. This improves positioning accuracy. Among them, the correlation between each data plays the role of mutual verification. The present invention uses a cross-checking method to efficiently solve the problem of clock out-of-sync between base stations, correct positioning data errors caused by clock out-of-sync, make synchronization and positioning parallel, improve the overall efficiency of the system, and migrate the system to positioning algorithms Strong.

Description

technical field [0001] The invention belongs to the technical field of wireless positioning, and relates to a clock calibration technology of a positioning system, in particular to a high-precision cross-checking clock synchronization method and system based on multi-base station positioning. Background technique [0002] Clock synchronization technology is a key issue in multi-base station real-time positioning systems, and the mainstream methods are divided into hard clock synchronization and soft clock synchronization. In actual situations, the clock frequency of different chips will drift due to different factors such as the aging degree of crystal oscillator, frequency characteristics, temperature, etc. In addition, due to the different power-on times of the chips, the absolute time axis between different chips will also deviate. [0003] The hard clock synchronization system includes a synchronization signal, a clock frequency generator and a base station signal. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W56/00
CPCH04W56/0015
Inventor 王闻今严格罗易凡侯宏卫房天昊吴驰
Owner SOUTHEAST UNIV
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