Inverse beamforming sonar system and method
First Claim
1. A method for detecting and processing sonar signals comprising the steps of:
- receiving a sonar signal;
generating a plurality of normalized output beam levels from said received sonar signal, said step of generating normalized output beam levels further comprising, generating a covariance matrix from said received sonar signal, said step of generating a covariance matrix from a received sonar signal further comprising calculating a Fourier solution thereby producing a time series of the signal source data, and generating output beam levels from said covariance matrix;
deriving peaks from said normalized output beam levels;
identifying said peaks within predetermined selection criteria over time; and
displaying and recording said identified peaks.
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Abstract
An apparatus and method for detecting, processing, and tracking sonar sigs is provided. Plane wave energy from the sonar signal source is measured at multiple points using an array of plane wave energy receptors. These measurements are processed using an inverse beamformer to generate output beam levels. These output beam levels are then processed using the spectrum normalizer to yield spatially and spectrally normalized output beam levels. The normalized beam levels are then processed using an eight nearest-neighbor peak-picker to provide plane wave peaks. Finally, the plane wave peaks are processed by a three-dimensioned M of N tracker to identify peaks within a specified limit of frequency and angle change over time. The identified peaks may be displaced or recorded for further analysis.
31 Citations
7 Claims
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1. A method for detecting and processing sonar signals comprising the steps of:
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receiving a sonar signal; generating a plurality of normalized output beam levels from said received sonar signal, said step of generating normalized output beam levels further comprising, generating a covariance matrix from said received sonar signal, said step of generating a covariance matrix from a received sonar signal further comprising calculating a Fourier solution thereby producing a time series of the signal source data, and generating output beam levels from said covariance matrix; deriving peaks from said normalized output beam levels; identifying said peaks within predetermined selection criteria over time; and displaying and recording said identified peaks. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification
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- Resources
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Current AssigneeThe Government Of The United States As Represented By The Secretary Of The Navy
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Original Assigneethe united states of america as represented by the secretary of the navy
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InventorsDonald, James, Nuttall, Albert H., Wilson, James H.
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Primary Examiner(s)Pihulic, Daniel T.
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Application NumberUS07/952,400Time in Patent Office246 DaysField of Search367/124, 367/901, 367/118, 367/119US Class Current367/124CPC Class CodesG01S 3/8083 determining direction of so...Y10S 367/901 Noise or unwanted signal re...
