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Device and method for underground long-distance transmission of Manchester code

A transmission device, long-distance technology, applied in transmission systems, wired transmission systems, line transmission components, etc., can solve problems such as distortion, signal attenuation, drift, etc., to reduce amplitude differences, reduce signal drift, and simplify The effect of the circuit

Active Publication Date: 2012-12-26
BEIHANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a long-distance underground transmission device and method of Manchester code, which is suitable for the harsh environment in the underground, solves the problem of serious signal attenuation, distortion, and drift in the long-distance underground transmission of single-ended signals, and can correctly decode

Method used

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  • Device and method for underground long-distance transmission of Manchester code
  • Device and method for underground long-distance transmission of Manchester code
  • Device and method for underground long-distance transmission of Manchester code

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Embodiment Construction

[0034] refer to figure 1 , a kind of Manchester code underground long-distance transmission device of the present invention is made up of Man code sending unit 12 and Man code receiving unit 14; Module 123 ; the Mann code receiving unit 14 includes an LC parallel resonance module 141 , a unipolar pulse generating module 142 , a Mann code decoding module 143 , and a communication module 144 .

[0035] refer to figure 2 The cable used in this embodiment is a 7000-meter three-core cable used by Daqing Petroleum Testing Service Branch for well logging. The DC power supply, ground and signal are respectively connected to the three core wires. The cable provided by the company is 7000 meters long The parameters of the corresponding equivalent resistance-capacitance network model 21 are as follows:

[0036] R 1 = R 2 =…=R 12 =18Ω,R 13 = 4.7Ω;

[0037] r 1 = r 2 =…=r 12 =1.8Ω, r 13 =0.47Ω;

[0038] C 1 =C 2 =…=C 11 =0.22μF,C 12 = 0.47μF.

[0039] refer to image 3 ,...

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Abstract

The invention discloses a device and a method for underground long-distance transmission of Manchester code (Man code), and belongs to the technical field of communication and the technical field of oil exploration. The device for the underground long-distance transmission of the Man code comprises a Man code sending unit and a Man code receiving unit. The Man code sending unit comprises a Man code encoding module, a bipolar pulse generating module and a push-pull driver module. The Man code receiving unit comprises an inductance-capacitance (LC) parallel resonant module, a unipolar pulse generating module, a Man code decoding module and a communication module. The Man code sending unit is used to compile data into a unipolar pulse and then generate a bipolar pulse, and the improved push-pull driver module is used to drive the bipolar pulse to be sent to a cable transmission unit. Appropriate inductance is selected in the Man code receiving unit and connected in parallel between a signal line of the receiving end of the cable transmission unit and a ground wire, LC parallel resonance is generated on the highest frequency component of Man code pulses, then the Man code unipolar pulse is generated, and the Man code unipolar pulse is decoded and transmitted to a host computer. The device and the method for the underground long-distance transmission of the Man code are suitable for an underground high temperature severe environment, the severe attenuation distortion drifting problem of single-ended signals in long-distance transmission can be resolved, and the unipolar pulse can be decoded correctly.

Description

【Technical field】 [0001] The invention belongs to the field of communication technology and petroleum exploration technology, in particular to a long-distance transmission device and method for a Manchester code (Manchester code for short) downhole, which is suitable for long-distance transmission of single-ended signals in a high-temperature and harsh environment underground. 【Background technique】 [0002] In oil exploration well logging, downhole instrument circuits need real-time data communication with ground systems, and relevant logging data can be transmitted to the ground in a timely and effective manner for processing. [0003] Manchester code (Manchester code for short) is often used as a coding method for downhole communication. Mann code is a code that combines the data in the transmitted bit stream with the timing signal, and is one of the commonly used code patterns for digital baseband transmission. Mann code uses a jump edge (rather than a level) to represe...

Claims

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Application Information

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IPC IPC(8): H04B3/04H04B3/23H03M5/12
Inventor 徐立军陈健军曹章胡金海刘兴斌
Owner BEIHANG UNIV
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