Method and system of transmission using a standard...

G - Physics – 01 – V

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

Patent

CA 2321151

Transmission method for connecting together a central control and seismic recording station, local intermediate control and concentration stations and local seismic data acquisition, processing and transmission units. It comprises using a transmission network working according to a particular transmission protocol in order to interconnect the central station and the intermediate stations for example, previous measurement of the data transit time on the transmission channels between the central station and acquisition units, pretriggering of seismic data acquisition by acquisition units, the holding time interval in relation to the time of reception of reference signal being fixed and greater than the transit time, and applying to reference signal, in the intermediate station, an adjusted compensation delay to take account of the effective transfer time fluctuations linked with its passage through multitask control means of the intermediate stations and transmission network in order to respect the holding time interval. All the acquisition units can thus be perfectly synchronized. The system can be applied for transmission of a TB concomitant with the triggering of a seismic source for example.

- Méthode de transmission pour relier entre elles, une station centrale de commande et d'enregistrement sismique, des stations locales intermédiaires de contrôle et de concentration et des unités locales d'acquisition, de traitement et de transmission de données sismiques. - Elle comporte l'utilisation d'un réseau de transmission fonctionnant suivant un protocole de transmission particulier, pour interconnecter la station centrale et les stations intermédiaires par exemple, la mesure préalable du temps de transit des données sur les voies de transmission entre la station centrale et les unités d'acquisition, le prédéclenchement de l'acquisition des données sismiques par les unités d'acquisition , l'intervalle de temps de garde par rapport à l'instant de réception du signal de référence étant fixe et supérieur au temps de transit et l'application au signal de référence dans la station intermédiaire, d'un retard de compensation ajusté pour tenir compte des fluctuations du temps de transfert effectif liées à son passage par des moyens de contrôle multi-tâches des stations intermédiaires et le réseau de transmission, pour respecter l'intervalle de temps de garde. De cette façon, on arrive à synchroniser parfaitement toutes les unités d'acquisition. - Application par exemple à la transmission d'un TB concomitant au déclenchement d'une source sismique.

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