Sercel Inc.

Fabien Le Moine

Sophie Lostanlen-Nouy

Florent Guichard

Daniel Pennec

Hubert Dieulangard

Gwenael Housin

It is proposed a method for collecting, in a collecting device distinct from a central unit, data coming from a plurality of seismic acquisition units. The method includes a step of assigning at least one device as a sink unit. For a given sink unit, the method also includes the following steps for data specific to at least one seismic acquisition unit not assigned as a sink unit: transmitting the specific data from the at least one seismic acquisition unit to the given sink unit, via a radio path established in a radio multi-hop network built at least with the given sink unit and the plurality of seismic acquisition units; and transmitting the specific data from the given sink unit to the collecting device, via a link.

Method for collecting, in a harvester equipment distinct from a central unit, data coming from a plurality of seismic acquisition units

It is proposed a method for providing synchronization in a data acquisition system including a plurality of acquisition units. A given acquisition unit of the plurality carries out the following steps: receiving a packet from another device of the data acquisition system; extracting a synchronization accuracy information and a reference clock information from the received packet; obtaining a first reference clock as a function of the extracted reference clock information; if the extracted synchronization accuracy information indicates a better synchronization accuracy than a current synchronization accuracy information associated to the given acquisition unit: taking the obtained first reference clock as a selected reference clock and updating the current synchronization accuracy information to indicate a lower synchronization accuracy than the extracted synchronization accuracy information.

Method for providing synchronization in a data acquisition system

Networks of data acquisition modules may include wireless and cabled networks. The data acquisition modules may include no antennas, one antenna, or two antennas. The antennas may be removable from a port on the data acquisition node allowing a common module design between the wireless and cabled networks. A rigid shell with arms may be constructed to house the antennas and a cable connector. The rigid shell may protect the antennas during transport, installation, and use of the data acquisition modules. For example, when driving a module into the ground, the rigid shell may prevent damage to the antennas.

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Bain de Bretagne, France

Fabien Le Moine