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A method and system for generating 2n sequence pseudo-random electromagnetic prospecting signals

A pseudo-random signal and signal generation technology, applied in the field of geophysical exploration, can solve the problems of cumbersome, inconvenient coding, and no pseudo-random coding, etc., and achieve the effect of increasing the scope of application and reducing the complexity and difficulty.

Active Publication Date: 2021-03-16
SHANDONG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the past, when generating 2n-sequence pseudo-random signals, they were still generated in the form of complex codes, especially for some multi-frequency 2n-sequence pseudo-random signals with different frequency ranges and different numbers of main frequency components, such as very The 13-frequency wave 2n sequence pseudo-random signal in the standard frequency band, that is, when generating a 2n sequence signal with a specific frequency combination corresponding to different exploration requirements, is often cumbersome, needs to be re-encoded and is not convenient, and there is no base number that is a multiple of 4, 8, etc. frequency generated pseudorandom code

Method used

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  • A method and system for generating 2n sequence pseudo-random electromagnetic prospecting signals
  • A method and system for generating 2n sequence pseudo-random electromagnetic prospecting signals
  • A method and system for generating 2n sequence pseudo-random electromagnetic prospecting signals

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Embodiment 1

[0042] This embodiment discloses a method for generating a 2n sequence pseudo-random electromagnetic prospecting signal, which is described by taking the generation of a 2n sequence odd-order wave as an example, and the generation of a 2n sequence even-order wave pseudo-random signal is also applicable. The methods include:

[0043] Step 1: Obtain the lowest and highest frequency of the main frequency, and the required frequency increase multiple, construct a series of periodic square waves with different frequencies and the same phase, and use the periodic square wave as the basic unit, wherein the increase multiple is 2 n .

[0044] Among them, the frequency range of the main frequency of the periodic square wave is related to the exploration depth. The lowest and highest frequencies of the main frequency can be selected according to the depth requirements to be detected (such as deep layers, shallow layers or other specific detection depths), and can be selected according t...

Embodiment 2

[0071] The purpose of this embodiment is to provide a 2n sequence pseudo-random electromagnetic survey signal generation system, including:

[0072] The demand acquisition module acquires the minimum or maximum frequency of the main frequency, and the frequency increase multiple of the demand, wherein the increase multiple is 2 n , n is a natural number;

[0073] The square wave construction module constructs a series of periodic square waves with different frequencies and the same phase according to the lowest or highest frequency and the multiplier;

[0074] The square wave superposition module superimposes the above-mentioned periodic square waves with different frequencies and the same phase to obtain a mixed signal;

[0075] The square wave correction module corrects the amplitude of the mixed signal to make it consistent with the amplitude of the periodic square wave to obtain a 2n sequence pseudo-random signal.

Embodiment 3

[0077] The purpose of this embodiment is to provide a computer-readable storage medium in which a plurality of instructions are stored, and the instructions are suitable for being loaded and executed by a processor of a terminal device:

[0078] Obtain the lowest or highest frequency of the main frequency, and the required frequency increase multiple, and construct a series of periodic square waves with different frequencies and the same phase, wherein the increase multiple is 2 n , n is a natural number;

[0079] The above-mentioned periodic square waves with different frequencies and the same phase are superimposed to obtain a mixed signal;

[0080] Correct the amplitude of the mixed signal to make it consistent with the amplitude of the periodic square wave, and obtain a 2n sequence pseudo-random signal.

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Abstract

The invention discloses a 2n sequence pseudorandom electromagnetic exploration signal generation method and system, and the method comprises the steps: obtaining the lowest or highest frequency of a main frequency and a required frequency increase multiple, and constructing a series of periodic square waves with different frequencies and the same phase, the increase multiple being 2n, and n beinga natural number; superposing the periodic square waves with different frequencies and the same phase to obtain a mixed signal; and correcting the amplitude of the mixed signal to enable the amplitudeto be consistent with the amplitude of the periodic square wave so as to obtain a 2n-sequence pseudo-random signal. According to the invention, the 2n pseudo-random signals with specific frequency combination can be generated, and the generation efficiency is greatly improved.

Description

technical field [0001] The invention relates to the field of geophysical prospecting, in particular to a method and system for generating 2n sequence pseudo-random electromagnetic prospecting signals. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] The 2n sequence pseudo-random electromagnetic signal has been widely used in artificial source electromagnetic prospecting due to the characteristics of the logarithmic uniform distribution of the frequency spectrum. For a standard 2n sequence pseudo-random signal, there are only -1, 0, 1 in the signal, so it is also called a signal generated by three-element self-closed addition. In practical applications, in order to avoid the no-load phenomenon during power supply , the odd 2n sequence pseudo-random signal is mainly used for exploration. At this time, there will only be -1, 1 values ​​in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/08
CPCG01V3/083
Inventor 杨洋何继善李帝铨瓮晶波孙怀凤
Owner SHANDONG UNIV
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