Monitoring the dipole moment vector of an airborne electromagnetic survey system

摘要

A method for monitoring a primary field dipole moment in a TDEM geological surveying system, including measuring a sign and amplitude of a primary field generated by a transmitter loop and sensed by a receiver in each of a plurality of sensitive axes, and in dependence thereon calculating a vector which represents orientation of the primary field at the receiver location in a receiver frame of reference; and determining, in dependence on the vector an orientation of the primary field dipole moment in a receiver frame of reference.