Underground life calling system

Abstract

The invention discloses an underground life calling system which comprises a plurality of calling devices, wherein each calling device comprises a power drive module, a composite magnetic doublet antenna, a plurality of broadband magnetic sensors, a signal conditioning and collecting module, a calculation and control module and an uninterrupted power supply (UPS) module, the calculation and control module controls the composite magnetic doublet antenna to send out magnetic field signals through the power drive module, the broadband magnetic sensors receive the magnetic field signals sent out by the composite magnetic doublet antenna in other calling devices and the magnetic field signals are transmitted to the signal conditioning and collecting module to be through broadband signal processing, then transmitted to the calculation and control module to be through signal analysis and processing, and the UPS module is used for supplying power for the broadband magnetic sensors, the signal conditioning and collecting module, the calculation and control module and the UPS module. A full-duplex communication method is applied in the underground life calling system, the magnetic field signals are adopted in signal transmission, and impacts of rock stratum environment are avoided. The underground life calling system is wide in signal cover, safe and reliable, provided with back-up power supplies and capable of guaranteeing continuous calling for help.

Description

technical field [0001] The invention relates to a wireless communication system, in particular to an underground life calling system. Background technique [0002] At present, the method and technology of ground-penetrating wireless communication researched at home and abroad mainly use the wireless communication principle of electromagnetic waves to penetrate the ground, using very low frequency (VLF) (3k~30kHz) or ultra low frequency (ULF) (300~3k Hz) Electromagnetic waves communicate through the ground. [0003] In China, in 2000, a number of companies jointly developed the "Mine Multifunctional Mobile and Disaster Relief Communication System" that uses leaky cables as information channels, which belongs to semi-wireless communication; Ground communication system and method, which are equipped with transceivers and handheld terminals on the ground and underground, and a direct sequence spread spectrum direct communication system is set between the ground loop antenna and...

AI Technical Summary

Problems solved by technology

It can be seen that most of the existing electromagnetic wave ground-penetrating communication systems in China use ground electrodes to send and receive current signals, which is inconvenient to use in high-resistance surrounding rock areas, and the underground electric field interference is relatively large. If the current signal is too weak, the signal-to-noise ratio will be very low. However, if the current signal is too strong, it is easy to cause safety hazards, and the existing communication methods have small channel capacity and are subject to large electromagnetic interference.

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