Onshore CSEM > In frequency domain

Basic concept of AEM in frequency domain (FDAEM) relies on matched pairs of transmitters and receivers, each pair working for a specific frequency (i.e. the resonance frequency) to increase the system response (Hodges, 2010).

Then, it is relevant to note that Frequency domain systems rely on continuous measurement of Electromagnetic fields while emitting with transmitter(s). Continuous measurements imply the need to remove primary field (from transmitters) before any computations on the signal, and therefore measurement accuracy must remain high.