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Ixsea

Exail

Didier Charlot

Fabien Napolitano

Catherine Truffert

Xavier Lalanne

Frederic Jean

Disclosed is a bathymetric system including a multi-beam emitting and receiving device attached to a carrier vehicle, configured, in a first recurrence, to measure the amplitude of a first plurality of beams reflected off the seabed, and a computer to determine three-dimensional spatial coordinates of a first scan swath. In a second recurrence, the device emits a second incident beam and measures the amplitude of a second plurality of beams reflected off the seabed, the computer determines the three-dimensional spatial coordinates of a second scan swath, so that at least one probe point of the first scan swath is redundant with a probe point of the second scan swath, and the computer calculates an altitude variation of the carrier vehicle using altitude variations of the at least one redundant probe point between the first recurrence and the second recurrence.

Bathymetric system and bathymetry method corrected for altitude errors

An acoustic positioning device includes an acoustic emitter and receiver. The device emits a sequence of at least one first acoustic signal (S) and one second acoustic signal (S), separated by a time interval T, and to receive and measure the arrival phase &#x3c6;of Sand the arrival phase &#x3c6;of S. The device measures a relative displacement between the acoustic emitter and the acoustic receiver and determines the approximate difference (R&#x2212;R)between the distance Rtraveled by Sbetween the acoustic emitter and receiver, and the distance Rtraveled by Sbetween the acoustic emitter and the acoustic receiver, and calculates the relative displacement (R&#x2212;R) between the acoustic emitter and the acoustic receiver as a function of the approximate difference (R&#x2212;R), of the time interval T and of the arrival phases &#x3c6;, &#x3c6;respectively of Sand of S

Acoustic positioning system and method

A synthetic antenna sonar system, includes:

Sonar imaging system with a synthetic aperture

The invention concerns a method for acquiring and processing magnetometric data for representing on an at least two-dimensional map magnetometric characteristics of a geographical zone including a step of measuring the intensity of a magnetic field () on a geographical zone producing a set of magnetometric data of intensity B(s), a step of computing 2D interpolation (), a step of computing reduction at the poles () and a step of computing an analytical signal (). The invention is characterized in that it includes sectioning the map of magnetic disturbances into a matrix of pixels, a step of locally updating in real time the map of magnetic anomalies, a step of locally updating in real time the map of 2D interpolation by applying the 2D interpolation calculation in the neighborhood of the updated pixel, a step of locally updating in real time the 2D map of reduction at the poles and a step of locally updating in real time the 2D map of the analytical signal.

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Le Relecq-kurhuon, France

Didier Charlot