초록 ▼

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 s

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.

대표청구항 ▼

[ We claim:] [1.] A receiver for wellbore telemetry or control signals, said receiver comprising:an input connector to connect to a signal transmission channel between a surface location and a location within a drillstring in the vicinity of a drill bit;a demodulator for converting signals received

[ We claim:] [1.] A receiver for wellbore telemetry or control signals, said receiver comprising:an input connector to connect to a signal transmission channel between a surface location and a location within a drillstring in the vicinity of a drill bit;a demodulator for converting signals received while drilling into binary data for further processing;said demodulator including a generator for generating a plurality of possible analog signals, said possible signals being representations of signals expected to be received while drilling via said transmission channel, and a comparator connected to said generator and connected to said input connector for selecting from said plurality of possible analog signals one signal with the highest probability of representing a signal received via said transmission channel while drilling and thereby demodulating said received signal.