Method for real-time extraction of ocean bottom properties
First Claim
1. A method for extraction of ocean bottom parameters in real-time comprising the steps of:
- periodically determining environmental parameters;
periodically determining a sonar system state configuration;
periodically obtaining a reverberation energy envelope;
monitoring the environmental parameters and the current sonar system state configuration for changes;
creating an eigenray computation model in response to changes in the environmental parameters or changes in the sonar system state configuration;
generating a reference reverberation model using the eigenray computation model; and
characterizing ocean bottom parameters from the reverberation energy envelope by using the eigenray computation model and the reference reverberation model. PG,44
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Abstract
A method for characterizing ocean bottom properties in real-time by explong the multipath structure of reverberation to extract values for bottom loss and the bottom scattering coefficient. The bottom parameters are extracted from a measured reverberation energy envelope generated from the reverberation returns of one or more pings from a sonar system. The measured reverberation envelope is compared to a reference reverberation model to identify a period of time in which the measured reverberation energy envelope exhibits properties that allow the extraction of bottom parameters. The bottom parameters are then extracted by direct comparison of the measured reverberation to the reference reverberation model within the time period or by iteratively changing the value of bottom loss or bottom scatter coefficient and recalculating the reference reverberation for the identified time period until the reference reverberation matches the representative reverberation. The accuracy of the reference reverberation model is maintained by continuously monitoring the current sonar state configuration and the current environmental parameters including bottom depth, sound speed profile, and wind speed and rebuilding the model should either the sonar configuration or the environmental parameters change in a manner which would cause a change in the model.
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Citations
11 Claims
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1. A method for extraction of ocean bottom parameters in real-time comprising the steps of:
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periodically determining environmental parameters; periodically determining a sonar system state configuration; periodically obtaining a reverberation energy envelope; monitoring the environmental parameters and the current sonar system state configuration for changes; creating an eigenray computation model in response to changes in the environmental parameters or changes in the sonar system state configuration; generating a reference reverberation model using the eigenray computation model; and characterizing ocean bottom parameters from the reverberation energy envelope by using the eigenray computation model and the reference reverberation model. PG,44 - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification