| 摘要 |
A method for identifying properties of a downhole electromagnetic network in a downhole too string, comprising the step of providing an electromagnetic path intermediate a first location and a second location on the electromagnetic network. The method further comprises the step of providing a receiver at the second location. The receiver comprises a known reference. The analog signal comprises a set amplitude, a set range of frequencies, and a set rate of change between the frequencies. The method further comprises the steps of sending the analog signal, and passively modifying the signal. The analog signal is sent from the first location through the electromagnetic path, and the signal is modified by the properties of the electromagnetic path. The method further comprises the step of receiving a modified signal at the second location and comparing the known reference to the modified signal.
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