Downhole Timing Recovery and Signal Detection
AssigneeXACT Downhole Telemetry Inc.
InventorJohn G McRory
Life of this patent
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Abstract
The present invention relates to telemetry apparatus and methods, and more particularly to acoustic telemetry apparatus and methods used in the oil and gas industry. More specifically, the invention relates to a method for enhancing a received signal transmitted by acoustic telemetry through a drill string by modifying the received signal by a multiplication of the received signal with a second waveform.
Claims17
A method for enhancing a received signal transmitted by acoustic telemetry through a drill string comprising the step of modifying the received signal by a multiplication of the received signal with a second waveform.
A method of enhancing a received chirp signal within a receiver wherein the received chirp signal has been transmitted by acoustic telemetry through a drill string, comprising the step of:
- applying a non-constant frequency local oscillator signal to the received chirp signal to selectively shift component frequencies of the received chirp signal by spreading the received chirp in the frequency domain while maintaining baud rate in order to create a processed signal having an increased time-bandwidth.
Dependencies are inferred from the claim text.