Independent device for determining absolute geographic...

G - Physics – 01 – S

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G01S 5/18 (2006.01)

Patent

CA 2592145

The invention relates to a device for autonomously determining its absolute geographic coordinates by a mobile changing with regard to immersion. The invention relates to mobiles operating while immersed and whose activity needs to be able to determine their absolute geographic coordinates. This is particularly the case of mobiles carrying out ground surveying operations, excavations or, more generally, exploration operations. By mobile, one also means a free diver, a manned vehicle or an automatic vehicle. The inventive device comprises on-board calculating means (31) associated with surface positioning means (32) of the GPS- or GALILEO-type receiver, with underwater positioning means (33) operating in conjunction, on the principle of homing, with a fixed immersed acoustic beacon (41), and with a set of sensors (36) enabling the mobile (42) to know its changing depth, its horizontality, and the difference between the followed direction and a fixed direction, for example, the magnetic north. The acquired data set is utilized by the calculating means for determining, at any moment, the absolute geographic position and the changing depth of the mobile (42), particularly when it changes with regard to immersion.

Dispositif de détermination autonome de ses coordonnées géographiques absolues, par un mobile évoluant en immersion. La présente invention concerne les mobiles évoluant en immersion et dont l'activité nécessite d'être en mesure de déterminer leurs coordonnées géographiques absolues. C'est en particulier le cas des mobiles effectuant des opérations de relevé de terrain, des fouilles ou plus généralement des opérations d'exploration. Par mobile on entend aussi bien un plongeur autonome, un véhicule habité ou encore un engin automatique. Le dispositif selon l'invention comporte des moyens de calcul embarqués (31) associés à des moyens de positionnement de «surface» (32), de type récepteur GPS ou GALILEO, à des moyens de positionnement sous-marins (33) fonctionnant en association, sur le principe du homing, avec une balise acoustique immergée fixe (41) et à un ensemble de senseurs (36) permettant au mobile (42) de connaître sa profondeur d'évolution, son horizontalité, et l'écart entre la direction suivie et une direction fixe, par exemple le nord magnétique. L'ensemble des données acquises est exploité par les moyens de calcul pour déterminer à tout instant la position géographique absolue et la profondeur d'évolution du mobile (42), en particulier lorsque celui-ci évolue en immersion.

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