Adaptive filtering with reference accelerometer for cancellation of tool-mode signal in MWD applications
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United States of America Patent
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Oct 22, 2002
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N/A
app pub date -
Nov 14, 2000
filing date -
Nov 14, 2000
priority date (Note) -
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Abstract
A method for eliminating the tool mode signal from a received combined signal including both tool mode and formation mode components, uses a signal from a reference receiver that is consists primarily of the tool mode signal. A transfer function is derived relating the time reversed combined signal and the time reversed reference signal and used to predict the tool mode portion of the combined signal. Subtracting the predicted tool mode portion of the combined signal from the combined signal gives an estimate of the formation mode component.
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