A self-synchronous transmission device for 3D acoustic logging data based on blind oversampling
A technology of blind oversampling of logging data, applied in the field of self-synchronous transmission devices for 3D acoustic logging data, can solve the problems of limited number of circuit connections and limited internal space of the instrument, and achieve the effect of reducing circuit connections
Active Publication Date: 2019-04-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0004] At present, the geometric dimensions of 3D acoustic logging tools have special requirements. The internal space of cylindrical tools is very limited, and the number of wiring required is large, including power bus, LVDS command line, LVDS data line, LVDS clock line, reset Signal line, start acquisition command line, and the number of circuit connections between the acquisition circuit near the probe and the control circuit is limited
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[0029] For the convenience of description, the relevant technical terms appearing in the specific implementation are explained first:
[0030] MLVDS (Multipoint low Voltage Differential Signaling): multipoint low voltage differential signal;
[0031] TCP / IP (Transmission Control Protocol / Internet Protocol): network communication protocol;
[0032] Modbus: an industrial field bus protocol;
[0033] RS-485: A standard that defines the electrical characteristics of drivers and receivers in a balanced digital multipoint system;
[0034] DMA (Direct Memory Access): direct memory access;
[0035] BPRZ (Bipolar Return-to-Zero): bipolar return-to-zero system;
[0036] FPGA (Field-Programmable Gate Array): field programmable gate array;
[0037] RAM (Random-Access Memory): random access memory;
[0038] figure 1 It is a schematic diagram of the self-synchronous transmission device for three-dimensional acoustic logging data based on blind oversampling of the present invention.
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The invention discloses a self-synchronous transmission device for three-dimensional acoustic logging data based on blind oversampling, which realizes communication between a control circuit and an acquisition circuit through an MLVDS A-B exchange circuit. The control circuit sends the sampling parameter command to the acquisition circuit through the MLVDS circuit A, the acquisition circuit receives the sampling command through the MLVDS circuit B, and uploads the sampled data to the control circuit through the MLVDS circuit B, and the control circuit receives the sample through the MLVDS circuit B. The data is finally uploaded to the ground system. The core of the whole device lies in the MLVDS switching circuit. The MLVDS switching circuit realizes stable and reliable transmission of sampling commands and data between the control circuit and the acquisition circuit based on blind oversampling technology, which meets the data stability requirements of the 3D acoustic logging tool.
Description
technical field [0001] The invention belongs to the technical field of three-dimensional acoustic logging, and more specifically relates to a self-synchronous transmission device for three-dimensional acoustic logging data based on blind oversampling. Background technique [0002] 3D acoustic logging is a new generation of acoustic logging technology developed on the basis of cross-dipole acoustic logging technology. Comprehensive measurement of the waveforms of various frequency bands to obtain the three-dimensional acoustic wave characteristics of the formation, that is, the changes of compressional wave time difference, shear wave and Stoneley wave in the axial, radial and circumferential directions of the wellbore, and provide a complete description of the azimuth of the formation characteristics. [0003] Traditional acoustic logging only measures acoustic signals in specific frequency bands, and the amount of measured data is small, so the low-speed transmission method...
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IPC IPC(8): H04L7/00H04L7/04
CPCH04L7/0079H04L7/0091H04L7/041
Inventor 师奕兵张伟李焱骏邓伟石晓伟刘苏浪
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA