Abstract
Through-the-earth positioning technology plays a vital role in mine rescue. To achieve through-the-earth positioning in the complex earth that contains geomagnetic noise, water, and rocks, we design a magnetic induction through-the-earth positioning scheme that includes positioning methods and a noise reduction method. The positioning scheme achieves three-dimensional through-the-earth positioning with high precision and long distance. Using the directional characteristics of the magnetic field vector distributed by the transmitter coil horizontally placed underground, we design two positioning methods to determine the horizontal two-dimensional position and vertical dimensional position of the transmitter, respectively. Taking advantage of the extremely narrow bandwidth of the sinusoidal signal in the spectrum, we design a noise reduction method to reduce the influence of noise on positioning accuracy. The simulation results show that the positioning error of the positioning method based on the signal direction is less than that of the positioning methods based on the equations, path loss, and the optimization algorithm, and the noise reduction performance of the frequency-point amplitude acquisition method is better than that of the bandpass filter. The simulation results also show that the positioning scheme proposed in this paper can penetrate 1000 meters of the earth to achieve high-precision through-the-earth positioning with errors of less than 2 meters.
Highlights
When the mine disaster occurs, traditional communication methods such as wired and cellular wireless communications will be interrupted
Aiming at the above problems in the existing positioning methods, we propose a high-precision magnetic induction through-the-earth positioning scheme achieving 3D positioning in this paper
Since this paper has proved that the vertical positioning method based on the signal direction has a smaller positioning error than the vertical positioning methods based on path loss and the optimization algorithm, we will not compare the latter two
Summary
When the mine disaster occurs, traditional communication methods such as wired and cellular wireless communications will be interrupted. Song et al first rotate the single-axis coil of the receiver in the horizontal and vertical dimensions At this time, the signal strength of the three-axis transmitter will change. Aiming at the above problems in the existing positioning methods, we propose a high-precision magnetic induction through-the-earth positioning scheme achieving 3D positioning in this paper. The receiver on the ground consists of three mutually orthogonal inductive core coils On this hardware scheme, we design a horizontal positioning method and a vertical positioning method based on the directional characteristics of the positioning signal vectors, which determine the orientation of the underground transmitter in the horizontal two-dimension and vertical dimension, respectively. Since the directions of the vectors are not affected by the conductivity of the earth media, the positioning methods in this paper eliminate the positioning errors caused by the path loss.
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