Wireless measurement-while-drilling system polarization channel coding and decoding method based on Gray code structure

A technology of wireless measurement while drilling and encoding and decoding methods, which is applied in the directions of measurement, using linear codes for error correction/detection, and using block codes for error correction/detection, etc. It can solve the problem that ground instrument receivers are difficult to correctly restore downhole information.

Active Publication Date: 2019-11-01
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to adopt a wireless measurement-while-drilling system based on the Gray code structure in view of the technical defects that there are strong noise interference signal

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  • Wireless measurement-while-drilling system polarization channel coding and decoding method based on Gray code structure
  • Wireless measurement-while-drilling system polarization channel coding and decoding method based on Gray code structure
  • Wireless measurement-while-drilling system polarization channel coding and decoding method based on Gray code structure

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[0032] In order to have a clearer understanding of the technical features, objectives and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0033] Such as figure 1 Shown is a schematic diagram of a polarization channel coding method for a wireless measurement-while-drilling system based on the Gray code structure of the present invention. The method constructs a polarization channel coding method according to the structure of the Gray code; then according to this polarization channel coding method Design a continuous elimination list (SCL) decoding algorithm; finally apply the polarization channel coding method constructed by the Gray code structure to the coding module of the downhole instrument of the wireless measurement while drilling system, and apply this special SCL algorithm to the wireless The decoding module of the surface instrument of the MWD system.

[0034...

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Abstract

The invention discloses a wireless measurement-while-drilling system polarization channel coding method based on a Gray code structure, and the method comprises the steps: constructing a polarizationchannel coding method according to the structure of a Gray code, and the coding method being used in a channel coding module of an underground instrument of a wireless measurement while drilling system; designing a continuous cancellation list (SCL) decoding algorithm according to a channel coding method of an underground instrument, and then applying the algorithm to a decoding module of a groundinstrument of a wireless measurement while drilling system to recover underground sent data. The method has the advantages that the constructed polarization channel coding method has a Gray code structure and has better error code performance than a common polarization code, so that the potential of the polarization code is further excited, the bit error rate of the wireless measurement-while-drilling system is effectively reduced, and the reliability of the system is improved.

Description

technical field [0001] The invention relates to the technical field of measurement-while-drilling of oil, natural gas, coal mines, etc., in particular to a polarization channel coding method of a wireless measurement-while-drilling system based on a Gray code structure. Background technique [0002] The data transmission methods of the wireless measurement-while-drilling system include mud pulse, electromagnetic wave and sound wave. The wireless measurement-while-drilling system is divided into two parts: downhole instruments and surface instruments. The downhole instruments mainly include sensor modules, channel coding, modulation modules and power amplifiers; the surface instruments mainly include signal conditioning modules, signal processing modules, demodulation modules and decoding modules. module. The system mainly transmits downhole engineering parameters and geological parameters. The amount of data sent downhole is small, and the code length of the sent data is us...

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Application Information

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IPC IPC(8): H03M13/15E21B47/12
CPCE21B47/12H03M13/1505
Inventor 王家豪蒋哲栋卢春华陈振兴倪效勇张祥莉
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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