System and method for depth determination of an impulse acoustic source by cepstral analysis
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsDonato M. Russo, Ronald Buratti
Life of this patent
Estimating the term…
Abstract
A system and method for making an accurate estimate of the activation depth for an impulse acoustic source includes recording sounds produced by the activation of the underwater impulse acoustic source over a time period sufficient to capture reverberation, performing a cepstral scan of the recording to determine a quefrequency corresponding to the impulse from the underwater impulse acoustic source and deriving a depth estimate from the quefrequency corresponding to the impulse from the underwater impulse acoustic source.
Claims8
A method for estimating the depth at which an underwater impulse acoustic source is activated, comprising:
- hydroacoustically recording sounds produced by activation of an underwater impulse acoustic source over a time period sufficient to capture reverberation;
- performing a plurality of cepstral scans of the recording and averaging the plurality of cepstral scans to determine an average quefrequency corresponding to the impulse from the underwater impulse acoustic source;
- and
- deriving a depth estimate from the average quefrequency corresponding to the impulse from the underwater impulse acoustic source.
A system for estimating the depth at which an underwater impulse acoustic source is activated, comprising:
- means for hydroacoustically recording sounds produced by activation of an underwater impulse acoustic source over a time period sufficient to capture a reverberation;
- means for performing a plurality of cepstral scans of the recording to determine an average quefrequency corresponding to the impulse from the underwater impulse acoustic source;
- and
- means for deriving a depth estimate from the average quefrequency corresponding to the impulse from the underwater impulse acoustic source.
A system for estimating the depth at which an underwater impulse acoustic source is activated, comprising:
- a sonobuoy receiver to receive sonobuoy hydroacoustic data comprising sounds produced by activation of an underwater impulse acoustic source;
- a digital recorder to record the sounds produced by activation of the underwater impulse acoustic source and reverberations therefrom;
- a signal processor for performing a plurality of cepstral scans of the recorded sounds to determine a quefrequency corresponding to the impulse from the underwater impulse acoustic source and for averaging the plurality of cepstral scans to determine an average quefrequency to derive a depth estimate from the average quefrequency corresponding to the impulse from the underwater impulse acoustic source;
- and
- a display for indicating the depth estimate from the average quefrequency corresponding to the impulse from the underwater impulse acoustic source.
Dependencies are inferred from the claim text.