Base station positioning method based on high-precision time synchronization network

Abstract

The invention discloses a base station positioning method based on a high-precision time synchronization network, and belongs to the field of navigation positioning. The method comprises the following steps: acquiring absolute time or relative time difference of transmission of radio waves between a terminal to be positioned and at least three base stations; obtaining spatial coordinate information of the base station in a preset coordinate; calculating a relative distance or a relative distance difference between the terminal to be positioned and the base station according to the absolute time or the relative time difference; according to the relative distance or the relative distance difference and the space coordinate information and a preset strategy, obtaining position information of a to-be-positioned terminal; and constructing an optical fiber tree topology structure network between the base stations. According to the method, the time synchronization error of a slave clock and a master clock is adjusted; the time synchronization of the slave clock and the master clock is realized, the time synchronization precision of the base station is improved, the subnanosecond level is reached, when the distance difference between the base station and the to-be-positioned mobile terminal is obtained through positioning calculation, the time value measurement is more accurate, the centimeter-level positioning error can be realized, and the positioning precision is greatly improved.

Description

technical field [0001] The invention belongs to the field of navigation and positioning, and in particular relates to a base station positioning method based on a high-precision time synchronization network. Background technique [0002] Location Based Services (LBS, Location Based Services) is a service that obtains terminal location information through wireless communication networks or other positioning systems, and then combines with geographic information systems to provide users with various location-related information. Today, outdoor location services based on GNSS (Global Navigation Satellite System) and other satellite positioning technologies have been widely used in practical applications such as vehicle navigation and shared bicycles, which have greatly improved the quality of life and created a huge commercial value. With the development of technologies such as the Internet of Things and the Internet of Vehicles, the demand for location-based services has show...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of limited time synchronization accuracy of existing base stations, which leads to low positioning accuracy of mobile device terminals, the present invention provides a base station positioning method based on a high-precision time synchronization network, in which the base station constructs a tree topology network through optical fibers, and the tree The type topology network includes root node clocks at all levels, the root node clock of each level is used as the master clock of the next level, and the root node clock of each lower level is used as the slave clock of the upper level; by adjusting the slave clock and The time synchronization error of the master clock realizes the time synchronization between the slave clock and the master clock, which greatly improves the time synchronization accuracy of the base station and reaches the sub-nanosecond level. When the positioning calculation obtains the distance difference between the base station and the mobile terminal to be positioned, the time The value measurement is more accurate, and centimeter-level positioning error can be realized, which greatly improves the positioning accuracy

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