Signal decoding method and device
A decoding method and signal technology, which are applied in the direction of electrical/magnetic detection for logging records, shaping network in transmitter/receiver, digital transmission system, etc., can solve the problem of weak useful signal and short transmission depth of EMMWD signal. , low signal frequency, etc.
Active Publication Date: 2017-12-01
BC P INC CHINA NAT PETROLEUM CORP +1
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[0004] Since the magnetotelluric channel composed of the formation and the drill string is a special channel, it attenuates the high-frequency signal in the transmission signal very severely, so that the signal frequency received by the ground is very low, and the useful signal contained in it is also very weak. Therefore, the signal transmission depth of EMMWD is short, which limits the depth of EMMWD's underground use
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[0030] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0031] figure 1 It is a flowchart of a signal decoding method provided by an embodiment of the present invention. See figure 1 , This embodiment includes:
[0032] 101. Perform an auto-correlation operation on the received signal to remove the noise signal in the signal to obtain a first signal.
[0033] 102. Perform zero-point tracking on the first signal, remove the zero-point drift of the first signal, and obtain a second signal.
[0034] 103. Adjust the signal amplitude of the second signal to obtain a third signal, and the signal amplitude of the third signal is within a preset range.
[0035] 104. Adjust the phase and frequency of the frame code of the local signal so that the local signal is frame-synchronized with the third signal, and the ...
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The invention discloses a signal decoding method and device, belonging to the technical field of well logging. The method includes: performing an autocorrelation operation on the received signal, removing a noise signal, and obtaining a first signal; performing zero point tracking on the first signal, removing zero point drift, and obtaining a second signal; adjusting the signal amplitude of the second signal, Obtain the third signal; adjust the phase and frequency of the local signal frame code, so that it is synchronized with the third signal frame, and use the frame start point as the frame start point of the third signal; adjust the local signal symbol, so that it is synchronized with the third signal bit, Use the starting point of the bit as the starting point of the third signal; start from the starting point of the third signal, obtain the signal within one cycle, perform correlation calculations on the signal within one cycle and the existing signal waveform set, and start from the existing signal waveform Centrally determine the waveform of the third signal to realize decoding. Even when the receiver receives a signal with weak signal strength or even a signal with a low signal-to-noise ratio, it can accurately decode the signal.
Description
Technical field [0001] The invention relates to the field of logging technology, in particular to a signal decoding method and device. Background technique [0002] MWD tools are measurement tools that use drilling fluid or electromagnetic channels as transmission media to continuously transmit measurement signals during the drilling process. The tool can measure geological and engineering parameters near the bit in real time. [0003] With the popularization and use of technologies such as gas drilling and underbalanced drilling, the EMMWD (Electromagnetic Measurement While Drilling) tool that uses the magnetotelluric channel composed of the drill string and the formation as the transmission medium has gradually attracted people’s attention. The signal transmission speed is high, the data can be transmitted without circulating drilling fluid, the measurement time is short, and the cost is low. [0004] Because the magnetotelluric channel composed of stratum and drill string is a sp...
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IPC IPC(8): H04B1/10H04L25/03H04L1/00G01V3/30
Inventor 彭烈新李林魏志刚张连成石荣
Owner BC P INC CHINA NAT PETROLEUM CORP