Gem-2A Broadband Airborne Em System

A helicopter towed broadband EM system capable of simultaneously transmitting and<br>receiving at several user-selected frequencies has been developed and is currently<br>operational in mineral and environmental programs. The system employs advanced<br>digitally controlled transmitter electronics providing flexible user selections for current<br>waveforms, as well as advanced built-in digital signal acquisition and processing<br>including real-time sine/cosine correlation for spectral analysis of the data. The system<br>architecture and performance are discussed in the context of conventional EM mapping,<br>advanced product derivations and the facilitation of new methodological approaches in<br>the application of airborne EM techniques.