Ocean acoustic tomography
First Claim
1. A method for collecting data in a large body of water, such as the ocean, comprising the steps of:
- deriving an offset time interval related to source data to be transmitted;
transmitting an acoustic signal from an acoustic source delayed from a preselected transmission time by the offset time interval;
determining a measured arrival time at which the acoustic signal is received at a receiver, the travel time of the acoustic signal between the source and the receiver being distinguishably larger than the offset time interval; and
deriving the source data from the measured arrival time.
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Abstract
An acoustic tomography telemetry system and method allowing spatially averaged ocean temperatures to be measured in real-time. The system includes autonomous acoustic sources mounted on subsurface moorings and receivers that are either suspended from drifting surface buoys or cabled to shore. The telemetry method largely eliminates, in real-time, corruption of acoustic travel times due to wander of the source'"'"'s mooring by shifting the start times of tomographic transmissions. Corrections to source wander are obtained without expending battery energy over and above that used in conventional tomography experiments. Standard techniques are used to correct clock errors at the source in real-time.
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Citations
20 Claims
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1. A method for collecting data in a large body of water, such as the ocean, comprising the steps of:
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deriving an offset time interval related to source data to be transmitted; transmitting an acoustic signal from an acoustic source delayed from a preselected transmission time by the offset time interval; determining a measured arrival time at which the acoustic signal is received at a receiver, the travel time of the acoustic signal between the source and the receiver being distinguishably larger than the offset time interval; and deriving the source data from the measured arrival time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for collecting ocean data, comprising the steps of:
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determining a three dimensional position offset between a tethered acoustic source and an anchor point for the source; deriving an offset time interval related to the three dimensional position offset; transmitting an acoustic signal from an acoustic source, the time of transmission of the acoustic signal being delayed from a preselected transmission time by the offset time interval; determining a measured arrival time of the acoustic signal at a free-floating buoy, the travel time of the acoustic signal between the tethered acoustic source and the free-floating buoy being distinguishably smaller than the offset time interval; and deriving data from the measured arrival time. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification