System for underground communication and staff monitoring based on TD-LTE technology

Abstract

The invention relates to a system for underground communication and staff monitoring based on a TD-LTE technology. The system comprises mobile terminals, a relay station, a communication base station, a location server, a switchboard, a core network device, host computers, and transmission lines. The mobile terminals and underground base station nodes and the location server are connected with each other through wireless interfaces, and trinity communication monitoring environment is formed. The switchboard gathers a plurality of underground base station nodes through optical fibers, and connects the gathered underground base station nodes with a ground base station. The ground base station accesses a public switched telephone network through the core network device. Main transmission channels of the system uses wired optical fibers. Wireless channel uses an orthogonal frequency-division multiple access technology and a multiple-input multiple-output modulation technology. An original underground monitoring positioning algorithm is improved by using a mixed measurement mode of signal transmits-receive time measurement and angular measurement. Information of underground staff positions is obtained by using a circle coordinate setting method. The improved system and algorithm effectively solves problems of difficulties of high quality communication and monitoring positioning under complex and harsh conditions in mines.

Description

technical field [0001] The invention relates to a communication monitoring system, in particular to an underground communication and personnel monitoring system based on TD-LTE technology, which belongs to the technical field of mobile communication. It is especially suitable for the measurement of communication and location information of underground coal mine workers. The communication monitoring system includes a mobile terminal, a relay station, a communication base station, a positioning server, a switch, a core network device, a host computer and a transmission line. Background technique [0002] In recent years, research on methods and methods of underground mobile communication and monitoring in coal mines has received extensive attention. The relatively backward traditional underground communication and monitoring methods can no longer meet the requirements of modernization. Most of the existing underground communication systems currently use induction communicatio...

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Problems solved by technology

[0006] In order to overcome the poor resistance to external damage and low extension of the existing underground wired communication positioning cable, it is easy to be broken or melted after an accident; the existing underground wireless communication system has simple structure and single function, low speed, high delay, and blind area The phenomenon is serious, the measurement accuracy of the personnel position monitoring algorithm is low, the measurement range is small, and the robustness is poor. Location Algorithm

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