Delegation Generale Pour L'armement

Charles Bertolino

The invention relates to a method of screening an acoustic signal or a spectrum line of maximum energy transmitted by a &ldquo;target&rdquo; that can be submerged at sea, from among a multitude of acoustic signals coming from any noise generators radiating acoustic signals of the same type with higher energy than energy E, employing, for example, (1) a set of N submersible acoustic pickups identically parameterized in surveillance mode, designed to detect the presence of the signal or a desired spectrum line, with the set of N pickups defining any number of surveillance cells with two adjacent pickups, each pickup being associated with one or more target detection regions defined as the geographic areas within which the presence of the &ldquo;target&rdquo; is deemed detectable and outside which the &ldquo;target&rdquo; is deemed nondetectable, and (2) a maximum number Nmax of pickups relating to one or more &ldquo;special&rdquo; areas (selected from a set of elementary geographic areas) of a given surveillance cell able simultaneously to detect the &ldquo;target&rdquo;, wherein acoustic signal or line is detected by a number Nd of acoustic pickups in the set of N pickups and analyzed by a series of steps, principally: defining the conditions under which the noise generator is located and determining it relative to the special areas.

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Six-Fours, France

Charles Bertolino