| 摘要 |
A method of deriving a calibration filter for electromagnetic data is provided. The method comprises providing a source (21, 22) of electromagneti c radiation and subsequently measuring components of the source electromagneti c field (23, 24, 25) at a receiver when the source is sufficiently close to th e receiver that the down-going signal dominates over the up-going signal reflected from features below the receiver. Such a measurement can be used i n 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 surv ey.
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