A Wireless Transmission Subsystem for Very Low Frequency Through-the-Earth Communication

Abstract

The invention discloses a wireless transmission subsystem for VLF through-the-earth communication, comprising a transmitter and a receiver. The transmitter first adaptively encodes and modulates speech codes and short messages or data to obtain a VLF modulated output signal, and sends the VLF modulated output signal to a flexible transmitting antenna for transmission after power amplification andautomatic tuning. The flexible transmitting antenna is configured to generate and transmit a VLF signal of a predetermined carrier frequency. In the receiver, a highly sensitive receiving antenna anda variable-gain low-noise amplifying unit form a weak signal detecting circuit to receive the VLF signal from the transmitter. The VLF signal is subjected to adaptive interference suppression processing, then is subjected to demodulation and channel error correction decoding, and finally is sent to an external interface through voice decoding and the like. In summary, the wireless transmission subsystem enhances the energy of weak signals, achieves normal communication requirements, improves the stability of through-the-earth communication, and provides a new way for mine disaster communication.

Description

technical field [0001] The invention relates to the technical field of through-the-earth communication, in particular to a wireless transmission subsystem of very low frequency through-the-earth communication. Background technique [0002] my country is one of the countries with frequent accidents in coal mines and other types of mines. Generally speaking, my country's coal mine production is following an extensive economic growth path with high investment, high energy consumption, low output, and low return. Safety issues are particularly prominent , Mining accidents often occur. [0003] Mining is the basic industry of national economic and social development, but the occurrence of mine accidents will cause heavy loss of personnel and property. There are many reasons for the accident, one of the main reasons is that the safety facilities are not in place, and the safety equipment funds invested by enterprises are insufficient, especially the basic safety facilities of some...

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Problems solved by technology

[0004] However, when a disaster occurs, the wired communication channel usually used for communication may have been destroyed, which hinders the timely rescue work, resulting in a reduction in the possibility of the trapped people surviving and a heavy loss of property.

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