Underground coal mine WiFi (Wireless Fidelity) staff positioning system and positioning method based on TOA (Time of Arrival)

Abstract

The invention discloses an underground coal mine WiFi (Wireless Fidelity) staff positioning system and positioning method based on TOA (Time of Arrival), belonging to the field of coal mine monitoring and communicating. An underground staff positioning module is a system structure adopting a WiFi integrated communication base station, a WiFi positioning substation and a WiFi staff positioning card. Signal transmission time between the staff positioning card and the communication base station and between the staff positioning card and the positioning substation is measured by one wired signal medium and two WiFi signal media, and an accurate distance value is obtained by calculating a hold-down timing error; and the position of the staff is obtained by utilizing the covering direction of a positioning antenna for receiving the signal, so that the accurate positioning of the location of the coal mine underground staff is realized. The underground coal mine WiFi staff positioning system is integrated to a coal mine underground WiFi integrated communication system for realizing the accurate positioning of the mine coal underground staff on the condition of not increasing the quantity and density of the devices, thereby realizing improving the positioning accuracy of the staff by the existing coal mine underground staff positioning system and solving a problem that the communication system is managed in a split manner.

Description

technical field [0001] The invention relates to a TOA-based coal mine underground Wi-Fi personnel positioning system and positioning method, and is specifically applied in the field of mine monitoring and communication. Background technique [0002] The "Notice of the State Administration of Work Safety and the National Coal Mine Safety Supervision Bureau on the Construction and Improvement of the "Six Major Systems" for Underground Coal Mine Safety and Avoidance" (An Jian Zong Meizhuang [2010] No. 146) requires the construction and improvement of the coal mine underground personnel positioning system. Give full play to the role of the underground personnel positioning system in personnel management and emergency rescue work. "Priority should be given to products with advanced technology, stable performance, and high positioning accuracy to ensure that the dynamic distribution of underground personnel and the number of personnel in the mining face are accurately grasped." ...

AI Technical Summary

Problems solved by technology

[0014] In the coal mine underground roadway, there are flammable gases such as methane and coal dust, the space is narrow and there are dampers, locomotives and other blocking objects, the roadway is inclined, there are turns and branches, the surface of the roadway is rough, etc., the transmission loss is large, and there will be many in the communication channel. Unfixed and unpredictable loss factors make it impossible to effectively estimate signal energy; at the same time, coal mine underground roadways are distributed in strips or strips, and the length of the roadway can reach tens of kilometers, while the width and height can only reach a few meters. It cannot be analyzed as a two-dimensional plane or three-dimensional space. Therefore, the above-mentioned combined energy estimation applied to the ground or the TOA positioning system and method that uses two-dimensional plane or three-dimensional space as the positioning environment are not suitable for direct application to the positioning of personnel in coal mines

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