Patent ID: 6924645

Claim:
In an overall system in which a dipole electromagnetic transmitter is disposed within a given region along a path while transmitting a locating field, a portable locator comprising: (a) a receiver arrangement including at least first and second antennae positioned transverse to one another, said first and second antennae simultaneously sensing at least respective first and second orthogonal components of said locating field, said receiver arrangement producing respective first and second, at least substantially simultaneous, electrical signals, which first and second electrical signals are functions of said first and second orthogonal components sensed by said first and second antennae; and (b) an electronic processor for receiving said electrical signals at least substantially simultaneously and configured for responding to movement of the above ground portable locator, which movement causes variation in the electrical signals, as detected by the portable locator, and using a vector sum established from the electrical signals to determine the location of said transmitter within said region.