Train positioning method, device and system in tunnel based on leaky cable

CN116828590BActive Publication Date: 2026-07-21BEIJING UNIV OF POSTS & TELECOMM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING UNIV OF POSTS & TELECOMM
Filing Date
2023-04-27
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing train positioning systems in tunnel scenarios have high maintenance and construction costs, limited positioning accuracy, and the broadcasting of 5G PRS will consume communication resources. Furthermore, existing positioning methods based on 5G signals have limited positioning accuracy and difficulty in determining integer ambiguity.

Method used

A train positioning method based on leaky cable in tunnels is adopted. The carrier phase and code phase information are extracted by receiving integrated communication and navigation signals from the leaky cable. A system of simultaneous equations for the carrier and code phases is constructed, and extended Kalman filtering is used to fix integer ambiguity. The positioning is then performed in combination with the leaky cable hole information.

Benefits of technology

It reduces the construction and maintenance costs of train positioning in tunnel scenarios, improves positioning accuracy and efficiency, and achieves centimeter-level high-precision positioning.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application provides a train positioning method, device and system based on a leaky cable in a tunnel, the method comprising: extracting corresponding carrier phase information and code phase information from a current obtained through-integrated signal for leaky cable positioning, the through-integrated signal being received by a receiver on a train running in the tunnel from the leaky cable; obtaining a number of a target slot closest to the receiver in the leaky cable, and constructing a carrier and code phase simultaneous equation set according to the carrier phase information, the code phase information and the number of the target slot; fixing the integer ambiguity of the carrier phase in the carrier and code phase simultaneous equation set and determining the position of the receiver based on the number of the target slot in the way of extended Kalman filtering, so as to realize the positioning of the train. The application can effectively reduce the construction and maintenance cost of train positioning in a tunnel scene, and effectively improve the precision and efficiency of train positioning in a tunnel.
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