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Elastic wave through-the-earth signal diversity reception method

A diversity reception and elastic wave technology, applied in frequency diversity, diversity/multi-antenna systems, electrical components, etc., can solve the problems of not considering multi-mode signals and multi-transfer carrier signals, so as to suppress multipath fading and improve receiving gain , Improve the effect of SINR

Inactive Publication Date: 2010-09-08
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0007] The above-mentioned diversity reception techniques do not consider multi-mode signals and multi-transfer carrier signals. The present invention is just to solve the problem of elastic wave multi-mode multi-frequency diversity reception.

Method used

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  • Elastic wave through-the-earth signal diversity reception method
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  • Elastic wave through-the-earth signal diversity reception method

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Embodiment Construction

[0042] A method for diversity reception of elastic wave ground-penetrating signals, comprising a channel detection step and an information transmission step;

[0043] The channel sounding steps include:

[0044] (1) Select a frequency point and a sequence code, spread-spectrum modulate the detection signal based on the sequence code and frequency point onto a certain carrier, and amplify the carrier signal;

[0045] (2) According to the carrier signal amplified in step (1), it is converted into an elastic P wave by a loudspeaker (elastic wave transmitting antenna) and coupled to the earth channel for transmission;

[0046] (3) according to step (2) through the signal after the ground channel propagation, receive respectively with P wave pickup, SH wave pickup, SV wave pickup and R wave pickup, the weak elastic wave signal that each pickup obtains is converted into electric signal;

[0047] (4) According to the four electrical signals obtained in step (3), the migration freque...

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Abstract

The invention provides an elastic wave through-the-earth signal diversity reception method, and relates to diversity reception technology applied in the fields of exploration and through-the-earth communication. In the method, signals dispersed at each frequency point and in each transmission mode are organically fused together at an earth channel receiving end by adopting a way of multi-mode reception and multi-frequency point reception diversity, so the signal-to-noise (SNIR) of the receiving end is improved. When elastic waves are transmitted in an earth medium, the transmission mode of the elastic waves is changed, while frequency is shifted under the influence of the piezoelectric effect, waveguiding effect and resonant cavity effect of the earth medium. The method provided by the invention has the advantages of improving reception gain by collecting signal energy dispersed in each mode and at each frequency point, and suppressing the attenuation of the elastic waves in the earth medium by the diversity combination of multi-mode and multi-frequency information to finally fulfill the aim of improving the detection performance of a receiver.

Description

technical field [0001] The invention relates to the technical field of geological exploration and ground-penetrating communication, in particular to a diversity receiving method of elastic wave ground-penetrating signals. Background technique [0002] In the ground-penetrating communication system, the single-frequency elastic wave is used as the carrier, the information is carried by the spread-spectrum modulated wave, and the modulated wave is coupled to the earth in the form of P wave by the ground-coupled speaker. At the receiving end, it is found that the received signal at more frequency points is closely related to the intensity of the transmitted signal. At the same time, the received signal not only contains the same P wave component as the transmitting end, but also S wave and R wave signals that are closely related to the transmitting signal. After consulting the relevant theories of seismic wave propagation and geological exploration, it is found that there are d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/12H04B1/69
Inventor 郭银景吕文红郝建军王婷杨军丁庆安王正杰
Owner SHANDONG UNIV OF SCI & TECH
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