Ground through communication system

Abstract

The invention discloses a through-the-earth communication system which comprises an earth coupling speaker and an earth coupling pick-up device, and stratum medium is arranged between the earth coupling speaker and the earth coupling pick-up device. A coder is arranged at a signal input end and is connected with a spread spectrum modulation and power amplifier which are connected with the earth coupling speaker, and the earth coupling speaker is positioned on the stratum or in the stratum at one side of a transmitting terminal. At the signal output end, the earth coupling speaker is positioned on the stratum or in the stratum at one end of a receiving terminal, the signal is received by the earth coupling pick-up device, the earth coupling pick-up device is connected with a low-noise amplification and frequency selection filter which is connected with a spread spectrum demodulator, and the reduction signal is output by the spread spectrum demodulator. The through-the-earth communication system has the advantages that the signal transmission distance can be prolonged in the stratum, the capacity of resisting disturbance is strong, and the like.

Description

technical field [0001] The invention belongs to the technical field of through-the-earth communication, in particular to a communication system for performing through-the-earth communication by using elastic waves. Background technique [0002] my country is one of the countries where coal mine accidents and other mine disasters occur frequently. Disasters such as explosion, flooding, roof fall, and fire cause huge loss of personnel and property every year. When many mine disasters occur, all means of contact between the underground and the ground will be lost. The ground personnel cannot know the location and situation of the underground personnel, and cannot formulate the most suitable rescue plan. This will inevitably greatly affect the efficiency of disaster relief. The low-frequency ground-penetrating communication system uses the earth medium as the propagation medium. Because the channel characteristics of this medium are not affected by underground disasters and acc...

AI Technical Summary

Problems solved by technology

[0005] Due to the complex structure of the formation medium, some formations absorb the elastic wave very obviously, so the attenuation of the elastic wave signal propagating in the formation is very large, which limits the propagation distance of the elastic wave

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