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Optimized Sampling of AEM Transients
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, First European Airborne Electromagnetics Conference, Sep 2015, Volume 2015, p.1 - 5
Abstract
This paper focuses on the sampling of the electromagnetic transient as acquired by airborne TDEM systems.
Typically, the sampling of the electromagnetic transient is done using a fixed number of gates whose width grows logarithmically (log-gating). The log-gating has two main benefits: improving the S/N ratio at late times, when the electromagnetic signal has amplitudes equal or lower than the natural background noise, and at same time ensuring a good resolution at the early times.
We propose a new sampling method, adapting the gating on the base of the slope variations in the EM transient.
Using synthetic models, we show that the adaptive-gating scheme improves both accuracy and precision of the estimated parameters of the inverse models.