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US 8,913,463 B2Granted
Positioning system
AssigneeElectromagnetic Geoservices Asa
InventorAudun Sodal
Life of this patent
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Abstract
A passive listening acoustic system and method of use may include source means for providing continuous, pulsed, or pulse coded acoustic signals at two or more frequencies and at least two acoustic sensors or hydrophones which detect and record a signal for use within a Seabed Logging system to determine the position and/or orientation of instruments in the system.
Claims9
A Seabed Logging system comprising:
- an electromagnetic source towed by or coupled to a seagoing vessel;
- at least one electromagnetic receiver located remotely from the electromagnetic source on a structure located at least temporarily on the seabed wherein each of the at least one electromagnetic receiver includes one or more electromagnetic sensors;
- and
- a passive listening acoustic positioning system, the passive listening acoustic positioning system comprising:
- an acoustic source transmitting at least two characteristic continuous, pulsed, or pulse coded acoustic signals at two or more different frequencies;
- and
- passive listening acoustic sensors or hydrophones also on the structure located at least temporarily on the seabed at a fixed location, at least two of the passive listening acoustic sensors or hydrophones being located close to each electromagnetic sensor and remotely from the acoustic source.
4 more elements
Dependencies are inferred from the claim text.