Patent ID: 11930463
Assignee: CHINA UNIVERSITY OF MINING AND TECHNOLOGY
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A time service and positioning network system for an underground chain-shaped large space in a coal mine, configured to implement a positioning of a terminal to be positioned in an underground roadway of a target coal mine, comprising a mining switch, a mining gateway, a mining computer, and a positioning terminal, wherein the mining switch is connected with the mining gateway by an optical fiber, and the mining gateway is connected with the mining computer by a network cable, and the system further includes a time service and positioning network system;
the time service and positioning network system includes at least two ad-hoc network base stations, the ad-hoc network base stations are arranged at equal intervals along the underground roadway of the target coal mine in sequence, and an interval between each two adjacent ad-hoc network base stations is not greater than a sum of communication ranges of the two adjacent ad-hoc network base stations, and a communication range formed by all of the ad-hoc network base stations covers the underground roadway of the target coal mine;
an area between each two adjacent pitheads is divided into two area segments that are adjacent but not overlapped to each other along a direction of the roadway for the area between each two adjacent pitheads in the underground roadway of the target coal mine, and each area segment respectively belongs to a pithead that each area segment abutted to, and an area segment between an end part of the roadway and a pithead adjacent to the end part of the roadway belongs to the pithead, that is, each area segment corresponding to each pithead is obtained;
a starting base station is arranged at a position nearest to the pithead and a position at a fixed interval from the position nearest to the pithead for the each area segment corresponding to each pithead, the starting base stations are numbered base station 1, the ad-hoc network base stations between two adjacent base stations 1 are numbered in sequence in a direction from a position nearest to the base station 1 to a position farthest to the base station 1 until the communication ranges of the ad-hoc network base stations having a same number are intersected;
each ad-hoc network base station has a same structure, each ad-hoc network base station includes a time service module with a built-in adjustable crystal oscillator, and a wireless communication module, a backup power supply module, an optical fiber port, and at least one wired expansion interface respectively connected to the time service module, wherein the wireless communication module is connected with the backup power supply module; and
each ad-hoc network base station is connected with the terminal to be positioned by wireless communication signals, the ad-hoc network base stations are connected to each other by optical fibers, and each ad-hoc network base station is connected with the mining switch by the optical fiber.