Patent ID: 7747387

Claim:
An apparatus for determining a resistivity property of an earth formation, the apparatus comprising: at least three antennas, each of the antennas switchable between a transmit mode wherein an electromagnetic wave is generated in the earth formation and a receive mode wherein a signal is produced responsive to a generated electromagnetic wave; and a processor configured to: (A) switch a first antenna of the at least three antennas to the transmit mode and generate a first electromagnetic wave, (B) switch a second antenna of the at least three antennas to the receive mode and produce a first signal responsive to the first electromagnetic wave, (C) switch the first antenna to the receive mode and produce a second signal responsive to a second electromagnetic wave produced by an antenna other than the first antenna, (D) use the first signal to make a first estimate of the resistivity property and use the second signal to make a second estimate of the resistivity property, and (E) record the first and second estimates of the resistivity property on a suitable medium.