Ultra wideband stratum communication system

A communication system and ultra-wideband technology, applied in the field of communication systems, can solve the problems of low power efficiency, large communication signal attenuation, and can only reach a few hundred meters, achieve high power feeding efficiency, increase the maximum distance, and long communication distance Effect

Inactive Publication Date: 2011-02-16
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This rock formation communication system can carry out digital or vocoder voice communication through electrodes nailed on the rock formation, but because it uses a conventional digital modulation method, it generates a continuous waveform signal with approximately constant amplitude, and sends it after being amplified by a linear power amplifier. Its power efficiency is low, so its communication transmission distance and communication reliability are difficult to meet practical requirements, so it has not been put into practical application so far
The fundamental reason is that the reliable communication distance of this kind of rock formation communication machine is too small, and the communication signal attenuates greatly in the rock formation. As the distance increases, the signal quickly becomes very weak, which is limited by the intrinsic safety requirements of downhole equipment. , the maximum allowable transmission power cannot be too large, so the communication distance can generally only reach a few hundred meters

Method used

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Examples

Experimental program
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Embodiment 1

[0031] refer to figure 1 , The ultra-broadband rock formation communication system provided by the present invention is composed of two transceivers connected with user terminals, a pair of common electrodes for sending and receiving, and a switching switch for sending and receiving. The first user terminal is connected to the first transceiver as one party, and the second user terminal is connected to the second transceiver as the other party, and a pair of electrodes nailed to the rock formation is used to send and receive signals on both sides , using the rock formation as the transmission medium to form a current field wireless communication channel for communication.

[0032] refer to figure 2, each transceiver includes a sending device and a receiving device. The transmitting device includes a channel coding unit, a spreading unit, a waveform shaping unit and a power amplifier; the receiving device includes a low-noise amplifier, a low-pass filter, a stage-spaced dire...

Embodiment 2

[0050] The system structure and communication process are exactly the same as those in Embodiment 1, but the technical parameters of each unit should be modified as follows, and the contents not listed are completely the same as in Embodiment 1.

[0051] The channel coding unit is exactly the same as in embodiment 1, and the bit rate of the encoded digital information is still R b = 1.25, 10, 80, 640, 1280 bits / second.

[0052] The spreading unit adopts M-ary spreading, M=16, k=4; the symbol rate corresponding to the above five kinds of information rates is still R s = 0.3125, 2.5, 20, 160, 320 baud / s; but the spreading chip rate is modified to R c =10240 code chips / second, corresponding spreading code code length N=R c / R s = 32768, 4096, 512, 64, 32; the proportion of 0-value chips in the ternary spreading code is changed to r 0 =15 / 16, all the other are identical with embodiment 1. Wave shaping unit, rectangular pulse width T p = 42 microseconds, the gap T between posit...

Embodiment 3

[0058] The system structure and communication process are exactly the same as those in Embodiment 1, but the technical parameters of each unit need to be modified as follows, and the contents not listed are exactly the same as in Embodiment 1.

[0059] The channel coding unit is exactly the same as in embodiment 1, and the bit rate of the encoded digital information is still R b = 1.25, 10, 80, 640, 1280 bits / second.

[0060] The spreading unit adopts M-ary spreading, M=4, k=2; the symbol rate corresponding to the above five kinds of information rates is R s = 0.625, 5, 40, 320, 640 baud / s; but the spreading chip rate is R c =7680 chips / second, corresponding spreading code code length N=R c / R s =12288,1536,192,24,12; the proportion of 0-value chips in the ternary spreading code is r 0 =11 / 12.

[0061] Wave shaping unit, rectangular pulse width T p = 54 microseconds, the gap T between positive and negative pulses g = 16 microseconds; 2T p +T g =124 microseconds, satis...

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Abstract

The invention discloses an ultra wideband stratum communication system which is mainly used for solving the problem that no reliable communication means can be taken when a serious accident occurs in a mine well. The ultra wideband stratum communication system comprises two transceivers, a pair of transmitting and receiving common electrodes and a transmitting and receiving changeover switch, a wireless channel is formed through the electrodes by using a stratum as a transmission medium so as to further form a time division duplex communication system. Each transceiver comprises transmitting equipment and receiving equipment, wherein the transmitting equipment comprise a channel coding unit, an M-element spectrum spreading unit and an E-class power amplifier; the receiving equipment comprise a low noise amplifier, a level-isolating straight-coupling capacitor, an AGC (Automatic Gain Control) amplifier, an A/D (Analog to Digital) converter and a dispreading, demodulating and channel decoding unit. A ternary pseudo random code with chip value of -1 or 0 or 1 is taken as an M-element spectrum spreading code, and a push-pull power amplifier with an output transformer is used as the E-class power amplifier. The invention has the advantages of small signal duty ratio, high peak-to-average power ratio, good error code characteristics and long transmission distance, and can provide a reliable communication means for mine well disaster relief.

Description

technical field [0001] The invention relates to a communication system, in particular to an ultra-broadband rock formation communication system, which can be used for underground emergency communication. Background technique [0002] Once a serious accident occurs in a coal mine, it may cause water leakage, power outage, landslide tunnel blockage, communication cable damage, etc., and the existing communication methods may not be applicable. The normal progress and actual implementation effect. In this case, it is a unique means of emergency communication to use the rock formation communication system, which uses the current field formed by the dipole electrodes and the rock formation as the transmission medium to form a wireless channel for communication. [0003] The existing rock formation communication systems mainly include the utility model patent "Portable Rock Stratum Communication Machine" (application number: 200820030023.7) applied by Xi'an Coal Research Institut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/69H04B13/00
CPCH04B13/02
Inventor 易克初刘祖军田红心田斌王勇超王杰令
Owner XIDIAN UNIV
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