Wireless exploration seismic system
First Claim
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1. A method for use in seismic data acquisition, comprising the steps of:
- disposing, in series, a plurality of seismic data acquisition modules that are operative to wirelessly communicate acquired seismic data, wherein said acquisition modules define a wireless serial data transfer path for relaying data from upstream acquisition modules to downstream acquisition modules and a data collection unit;
assigning a first acquisition module in said serial data transfer path a first multiplexing signature sequence, wherein in successive transmission periods, the first acquisition module advances sequentially through a first plurality of multiplexing signatures of the first multiplexing sequence; and
assigning a second acquisition module in said serial data transfer path a second multiplexing signature sequence, wherein in successive transmission periods, the second acquisition module advances sequentially through a second plurality of multiplexing signatures of the second multiplexing sequence;
wherein the first acquisition module and the second acquisition module are spatially distributed with respect to said wireless serial data transfer path, and wherein said first acquisition module advances from a first multiplexing signature to a second multiplexing signature within said first multiplexing signature sequence at substantially the same time as said second acquisition modules advances from a third multiplexing signature to a fourth multiplexing signature within said second multiplexing signature sequence.
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Abstract
Systems and methods for seismic data acquisition employing a dynamic multiplexing technique. The dynamic multiplexing technique may include advancing one or more modules in a seismic array through a multiplexing signature sequence in successive transmission periods. The multiplexing signature sequence may be random or pseudo-random. A shared multiplexing signature sequence may be used at all the modules in the seismic array. As such, modules belonging to a common collision domain may operate out of phase with respect to the shared multiplexing signature sequence.
21 Citations
17 Claims
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1. A method for use in seismic data acquisition, comprising the steps of:
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disposing, in series, a plurality of seismic data acquisition modules that are operative to wirelessly communicate acquired seismic data, wherein said acquisition modules define a wireless serial data transfer path for relaying data from upstream acquisition modules to downstream acquisition modules and a data collection unit; assigning a first acquisition module in said serial data transfer path a first multiplexing signature sequence, wherein in successive transmission periods, the first acquisition module advances sequentially through a first plurality of multiplexing signatures of the first multiplexing sequence; and assigning a second acquisition module in said serial data transfer path a second multiplexing signature sequence, wherein in successive transmission periods, the second acquisition module advances sequentially through a second plurality of multiplexing signatures of the second multiplexing sequence; wherein the first acquisition module and the second acquisition module are spatially distributed with respect to said wireless serial data transfer path, and wherein said first acquisition module advances from a first multiplexing signature to a second multiplexing signature within said first multiplexing signature sequence at substantially the same time as said second acquisition modules advances from a third multiplexing signature to a fourth multiplexing signature within said second multiplexing signature sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 15, 16)
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10. A method for use in seismic data acquisition, comprising:
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disposing a plurality of seismic data acquisition modules in an array, wherein each seismic data acquisition module is operative to wirelessly communicate with at least one other seismic data acquisition module in said array to define at least a first serial data transmission path; assigning each of said plurality of seismic data acquisition modules in said first serial data transmission path a multiplexing signature sequence for use in transmitting said seismic data; during a first common transmission period, transmitting seismic data from a first data acquisition module in said first serial data transmission path using a first multiplexing signature and transmitting seismic data from a second seismic data acquisition module in said first serial data transmission path using a second multiplexing signature, wherein at least a portion of the transmitting from the first data acquisition module during the first common transmission period and at least a portion of the transmitting from the second data acquisition module during the first common transmission period occur simultaneously; and advancing said first and second seismic data acquisition modules in their respective multiplexing signature sequences at substantially the same time such that said first seismic data acquisition module is assigned a third multiplexing signature and said second seismic data acquisition module is assigned a fourth multiplexing signature, wherein said third multiplexing signature is different than said first multiplexing signature and said fourth multiplexing signature, and said fourth multiplexing signature is different than said second multiplexing signature and said third multiplexing signature; during the second common transmission period, transmitting seismic data from said first data acquisition module using said third multiplexing signature and transmitting seismic data from said second seismic data acquisition module using said fourth multiplexing signature, wherein at least a portion of the transmitting from said first data acquisition module during the second common transmission period and at least a portion of the transmitting from the second data acquisition module during the second common transmission period occur simultaneously. - View Dependent Claims (11, 12, 13, 14)
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17. A method for use in seismic data acquisition, comprising the steps of:
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disposing, in series, a plurality of seismic data acquisition modules that are operative to wirelessly communicate acquired seismic data, wherein each of said acquisition modules receives data from only one upstream acquisition module and transmits data to only one downstream acquisition module thereby defining a serial data transfer path; first transmitting seismic data from a first acquisition module in said wireless serial data path to a first downstream acquisition module in said wireless serial data path; and second transmitting seismic data from a second acquisition module in said wireless serial data path to a second downstream acquisition module in said wireless serial data path; wherein at least a portion of the first transmitting and second transmitting occur simultaneously, and wherein interference between said first and second transmitting is avoided by using a unique multiplexing signature at the said first acquisition module and said second acquisition module, respectively.
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Specification