Synchronization method and system for elements of a seismic...

G - Physics – 01 – V

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G01V 1/22 (2006.01) G01V 1/26 (2006.01)

Patent

CA 2345870

Method and system for transferring synchronization data between a central control and seismic recording station and dependent stations in all the cases where the time of transmission through the connection channels between the elements may be liable to too great fluctuations. In its principle, the solution retained essentially consists in providing the communicating stations: a central station (CCU) and intermediate local control and concentration stations (RRS), themselves connected to local acquisition units (RTU), with a common time reference or clock (H) (that can for example be provided by a satellite positioning network of a well-known type such as the GPS system, or based on the carrier frequency of a Hertzian transmitter) which is picked up by specialized receivers associated with the elements of the seismic device, and in using this common reference to calculate the real transmission time and to locally readjust seismic acquisition units (RTU). Application: transmission of a TB concomitant with the triggering of a seismic source (S) for example.

Méthode et système pour transférer des données de synchronisation entre une station centrale de commande et d'enregistrement sismique et des stations dépendantes dans tous les cas où le temps de transmission sur les voies de liaison entre les éléments est susceptible de fluctuations trop importantes. Dans son principe, la solution retenue consiste essentiellement à munir les stations communiquantes : une station centrale et des stations locales intermédiaires de contrôle et de concentration, elles-mêmes reliée à des unités locales d'acquisition d'une référence temporelle commune ou horloge (qui peut être par exemple fournie par un réseau de positionnement par satellite d'un type connu tel que le système GPS ou basée sur la fréquence porteuse d'un émetteur hertzien) qui est captée par des récepteurs spécialisés associés aux éléments du dispositif sismique, et à utiliser cette référence commune pour calculer le temps de transmission vrai et recaler localement les unités d'acquisition sismique. Application par exemple à la transmission d'un TB concomitant au déclenchement d'une source sismique.

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