Systems and methods for inter-tool synchronization
AssigneeSchlumberger Technology Corporation
InventorsDesheng Zhang, Robert Tennent
Life of this patent
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Abstract
A method includes transmitting the hybrid timing signal, via a master clock, to the local clock of the tool, wherein the hybrid timing signal comprises one or more wide-band signal sections and one or more narrowband signal sections. The method also includes calculating an initial clock offset between the local clock of the tool and the master clock, based on a difference in the time of arrival and the hybrid timing signal at the local clock and a time of transmission of the hybrid timing signal and synchronizing the tool based on the initial clock offset.
Claims20
A method comprising:
- transmitting a hybrid timing signal, via a master clock, to a local clock of the tool, wherein the hybrid timing signal comprises one or more wide-band signal sections and one or more narrowband signal sections;
- calculating an initial clock offset between the local clock of the tool and the master clock based on a difference in a time of arrival of the hybrid timing signal at the local clock and a time of transmission of the hybrid timing signal;
- and
- synchronizing the tool based on the initial clock offset.
A non-transitory, computer-readable storage medium, comprising processor-executable routines that, when executed by a processor, cause the processor to perform operations comprising:
- transmitting a hybrid timing signal, via a master clock, to a local clock of the tool, wherein the hybrid timing signal comprises one or more wide-band signal sections and one or more narrowband signal sections;
- determining a time of arrival of the hybrid timing signal at the local clock based on a cross-correlation and a phase estimate, wherein the cross-correlation is generated between the wide-band signal section of the hybrid timing signal and a reference signal;
- determining a mean path delay of the hybrid timing signal;
- calculating an initial clock offset between the local clock of the tool and the master clock based on a difference in the time of arrival of the hybrid timing signal at the local clock and a time of transmission of the hybrid timing signal;
- and
- synchronizing the tool based on the initial clock offset.
A system, comprising:
- processing circuitry;
- and
- memory, accessible by the processing circuitry, the memory storing instructions that, when executed by the processing circuitry, cause the processing circuitry to perform operations comprising:
- transmitting a hybrid timing signal, via a master clock, to a local clock of the tool, wherein the hybrid timing signal comprises one or more wide-band signal sections and one or more narrowband signal sections;
- calculating an initial clock offset between the local clock of the tool and the master clock based on a difference in a time of arrival of the hybrid timing signal at the local clock and a time of transmission of the hybrid timing signal;
- and
- synchronizing the tool based on the initial clock offset.
Dependencies are inferred from the claim text.