Directional signal and noise sensors for borehole electromagnetic telemetry system
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United States of America Patent
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Sep 11, 2007
Issued Date -
N/A
app pub date -
Sep 29, 2003
filing date -
Aug 6, 2001
priority date (Note) -
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Abstract
An electromagnetic borehole telemetry system providing improved signal to noise ratio. Adaptive filters use noise channels as references to remove noise from the signal channel. Directional detectors provide a signal channel with reduced noise content and improved noise channels with reduced signal content. Directional detectors may be magnetometers aligned with the magnetic field, or antennas aligned with the electric field, of signal or noise sources. Alignment may be performed by beam steering of the outputs of a three-channel detector, which may detect both signal and noise.
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