Signal recognition system for wellbore telemetry

Details Signal recognition system for wellbore telemetry Signal recognition system for wellbore telemetry

1997-04-09

1999-09-21

Horabik, Michael

Communications: electrical

Wellbore telemetering or control

3408564, 367 81, 175 40, G01V 300

Patent

active

059559667

ABSTRACT:
Methods and apparatus are described for recognizing wellbore telemetry signals, wherein a received analog telemetry signal is compared to a number of possible analog signals. The probability of representing the received signal is determined for each of the possible analog signals. By selecting the signal with the highest probability, the received signal is demodulated. For calculating the probability, Bayes' method or any equivalent thereof is used. In variants, this probabilistic method is used to determine the synchronization point of the telemetry signal and for controlling the noise removal therefrom. The method and apparatus show increased accuracy in recognizing and demodulating the received signals.

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patent: 4468665 (1984-08-01), Thawley et al.
patent: 4903245 (1990-02-01), Close et al.
patent: 5157392 (1992-10-01), Zimmer

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