Underground positioning method based on signal relative field strength

Abstract

The invention discloses an underground positioning method based on signal relative field strength. The method provided by the invention can realize accurate positioning of underground work staff and moving targets using a specific positioning device through a positioning server and positioning reference point equipment, and has the advantages of simple and efficient positioning process, high electromagnetic interference resistance and high robustness. A positioning system using the positioning method has the characteristics of high positioning accuracy, low cost, simple structure of system equipment, easiness in implementation, and the like, is convenient for dispatching management of safety production management personnel, and can provide accurate staff position information for rescuers when a mine disaster occurs, thereby improving the rescuing efficiency and rescue probability of trapped workers.

Description

technical field [0001] The invention relates to a method for detecting and calculating an underground position, and the method relates to the fields of radio communication, distance measurement and positioning technology and the like. Background technique [0002] Downhole positioning is an important measure for safe production. Over the years people have adopted various methods to detect the position of underground personnel. Commonly used positioning methods are: Received Signal Strength Indication (RSSI), measurement of angle of arrival (Angle Of Arrival, AOA), measurement of time of arrival (Time Of Arrival, TOA), measurement of time difference of arrival (Time Difference Of Arrival, TDOA) And radio frequency identification technology (RFID, Radio Frequency Identification) and other methods. [0003] At present, the actual use is mainly based on radio frequency identification technology (RFID). RFID uses radio frequency to carry out non-contact two-way communication to...

AI Technical Summary

Problems solved by technology

[0004] 1. The positioning accuracy is limited by the distribution density of the readers, and can only achieve regional positioning, and cannot achieve accurate positioning with an error of a few meters;

[0005] 2. Limited by the reading and writing speed of RFID, it cannot handle the situation that many people pass through the card reading system at the same time, and it is easy to miss reading

However, the transmission loss model of wireless signals is greatly affected by the environment, so the general RSSI positioning system often has to rely on increasing the density of anchor nodes and using a global optimization algorithm to control the positioning error in one direction, but the underground environment is mostly a linear environment composed of tunnels. Field strength data in other directions on the plane cannot be obtained, and the positioning error is relatively large, so a more accurate RSSI positioning method that is more suitable for the underground roadway environment is needed

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