Method and apparatus for deriving a calibration filter for electromagnetic data
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United States of America Patent
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Nov 3, 2009
Grant Date -
Nov 13, 2008
app pub date -
Apr 1, 2005
filing date -
Apr 3, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of deriving a calibration filter for electromagnetic data is provided. The method comprises providing a source (21, 22) of electromagnetic radiation and subsequently measuring components of the source electromagnetic field (23, 24, 25) at a receiver when the source is sufficiently close to the receiver that the down-going signal dominates over the up-going signal reflected from features below the receiver. Such a measurement can be used in frequency domain analysis (26, 28, 29) to extract the down-going signal component and derive a calibration filter for the receiver. The method is repeated (27, 30) for each receiver used in an electromagnetic sounding survey.
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