Processing of Z Gradiometer Magnetic Data using Linear Transforms and Analytic Signal
Résumé
For 25 years the fluxgate gradiometer has been in common use in magnetic archaeological prospecting. It constitutes a cheap and light solution well adapted for the detection of earth‐filled and burned features and of elements built with brick or magnetic stones. Among the different processing techniques that can be applied to the magnetic data, we chose to use linear transforms, which aim at locating and delineating precisely the buried features and at correcting for field inclination using no a priori information about causative bodies. We applied these transforms to fluxgate ΔZ gradiometer data, by calculation in the spectral domain for both synthetic and measured data. The advantages of this application depend on the characteristics of the features searched for and of their environment, and several transformed maps can be calculated by the interpreter in order to choose the most convenient for a given survey