Giat Industries

Philippe Arnaud

Loic Laine

A process and device for detecting objects, in particular mines, dispersed in an area of land. The process implements a plurality of acoustic transducers. After determination of an optimal operational frequency, a brief acoustic pulse is emitted into the ground and then successive temporal reversals of signals received by the transducers focus detection on a first object. At least two transducers for which the propagation times are roughly equal are located and at least one location direction, defined as the mean perpendicular of the segment joining the at least two transducers, is determined.

Method and device for detecting objects dispersed in an area of land

Exercise mine and programming and simulation device therefor

A process and a device for detecting objects, in particular mines, dispersed in an area of land, or for determining propagation characteristics of an acoustic wave in the ground of an area of land. This process employs a plurality of acoustic transducers and reference targets distributed along borders of the area. After determining an optimal working frequency, a cartography of the propagation characteristics in the ground of the area of land is made, for example, by carrying out several temporal reversals, one after the other, of the signals received by the transducers so as to focus detection on the different reference targets. Objects are detected with the aid of this cartography by focusing detection by temporal reversal on an object and by searching for at least two transducers which have the lowest propagation time for the signal.

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Orleans, France

Philippe Arnaud