Method and device for detecting objects dispersed in an area of

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

1995-12-04

1997-03-25

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

G01S 380

Patent

active

056151748

ABSTRACT:
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.

REFERENCES:
patent: 5337289 (1994-08-01), Fasching et al.
patent: 5357063 (1994-10-01), House et al.

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