INVERSE TIMING METHOD, APPARATUS, AND APPLICATIONS
First Claim
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1. A timing method, comprising:
- establishing a running condition of a local node clock in each of one or more nodes, including generating a local timing schedule;
recording seismic data with the node while the timing schedule is running to generate a seismic record;
selecting a time of the seismic data recording with a discrete value of the timing schedule of the running node clock to establish a synchronization time;
associating a true time with the synchronization time; and
assigning the true time to the discrete value of the timing schedule of the running node clock,wherein the timing schedule of the running node clock prior to the discrete value of the timing schedule can be accurately associated the true time.
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Abstract
An ‘inverse timing’ method advantageously utilized for marine seismic applications involving one or more autonomous nodes involves the step of synchronizing the timing of newly recorded and/or prior recorded seismic data with a ‘true’ time whereby the synchronizing of timing is performed in a non-traditional ‘reverse’ manner rather than the traditional manner that is performed prior to recording the seismic survey data.
40 Citations
19 Claims
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1. A timing method, comprising:
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establishing a running condition of a local node clock in each of one or more nodes, including generating a local timing schedule; recording seismic data with the node while the timing schedule is running to generate a seismic record; selecting a time of the seismic data recording with a discrete value of the timing schedule of the running node clock to establish a synchronization time; associating a true time with the synchronization time; and assigning the true time to the discrete value of the timing schedule of the running node clock, wherein the timing schedule of the running node clock prior to the discrete value of the timing schedule can be accurately associated the true time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An inverse timing system, comprising:
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a true time source; a node operatively, wirelessly coupled to the true time source, wherein the node includes a local clock characterized as being in one of a non-running/sleep mode and a running mode and further characterized by a timing schedule and a time stamp in the running mode, further wherein the node includes a data recorder and a data record file operatively coupled to the timing schedule, wherein the data record file contains new recorded seismic data or does not contain new recorded seismic data; at least one of a transmitter, a receiver, and a transceiver operatively coupled to the true time source and the node, wherein the local node clock is in a running condition for a given time after the data record file contains new recorded seismic data prior to being in a synchronized running condition after the data record file contains new recorded seismic data.
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Specification