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Wireless data acquisition network

  • US 8,520,587 B2
  • Filed: 11/08/2005
  • Issued: 08/27/2013
  • Est. Priority Date: 07/28/2005
  • Status: Expired due to Fees
First Claim
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1. A seismic data acquisition device for oil exploration on ground comprising a wireless network including:

  • a set of nodes having each a first satellite positioning system for determining a first position of each node and at least one seismic sensor for acquiring seismic sensor data, the seismic sensors being disposed on or into the ground to capture echoes of waves emitted by seismic sources to construct a map of a subsurface of the ground,a concentrator to centralize said seismic sensor data, the concentrator being distinct from the nodes and having a second satellite positioning system for determining a second position of the concentrator, the concentrator is configured to calculate, based on the first positions of the first satellite positioning systems of the nodes and on the second position of the second satellite positioning system of the concentrator, the distance of each node relative to the concentrator and the direction of each node relative to the concentrator,wherein the first satellite positioning systems of the nodes and the second satellite positioning system of the concentrator bring a common time reference to the concentrator and to the nodes, and each node has means for time-stamping its seismic sensor data relative to the common time reference,the concentrator is also configured to send wirelessly commands for nodes of the network and configured to receive wirelessly said seismic sensor data,wherein each node has a sender and a receiver configured to receive wirelessly and pass wirelessly the commands to another node and configured to receive wirelessly said seismic sensor data from another node, send wirelessly and relay wirelessly said seismic sensor data to another node,wherein the concentrator is configured to control, based on said calculated distance relative to the concentrator, on said calculated direction of each node relative to the concentrator and on said common time reference, the routing of the commands from the concentrator to a node of the network through at least one other node of the network in allocated time slots, and is configured to control, based on said calculated distance relative to the concentrator, on said calculated direction of each node relative to the concentrator and on said common time reference, the routing of seismic sensor data from a node of the network through at least one other node of the network to the concentrator in allocated time slots,wherein the concentrator is configured to serve as a local geographic reference for the set of nodes,wherein the concentrator is configured to allocate, based on said calculated distance relative to the concentrator, on said calculated direction of each node relative to the concentrator and on said common time reference, to each node;

    said time slots during which the receiver of the node must receive the seismic sensor data originating from one or more other nodes of the network and the commands coming from the concentrator or one or more other nodes of the network,said time slots during which the node is switched to a standby mode, in which the sender of the node does not send, in which the receiver of the node does not receive and in which a memory of the node stores the commands received wirelessly from the concentrator or one or more other nodes of the network and the seismic sensor data received wirelessly from one or more other nodes of the network,said time slots during which the sender of the node must send the seismic sensor data and the commands to one or more other nodes of the network.

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