Journal article
Coherent averaging of the passive fathometer response using short correlation time
The Journal of the Acoustical Society of America, Vol.130(6), pp.3633-3641
12/2011
DOI: 10.1121/1.3654026
PMID: 22225020
Abstract
The passive fathometer algorithm was applied to data from two drifting array experiments in the Mediterranean, Boundary 2003 and 2004. The passive fathometer response was computed with correlation times from 0.34 to 90s and, for correlation times less than a few seconds, the observed signal-to-noise ratio (SNR) agrees with a 1D model of SNR of the passive fathometer response in an ideal waveguide. In the 2004 experiment, the fathometer response showed the array depth varied periodically with an amplitude of 1m and a period of 7s consistent with wave driven motion of the array. This introduced a destructive interference, which prevents the SNR growing with increasing correlation time. A peak-tracking algorithm applied to the fathometer response of experimental data was used to remove this motion allowing the coherent passive fathometer response to be averaged over several minutes without destructive interference. Multirate adaptive beamforming, using 90s correlation time to form adaptive steer vectors which were applied to 0.34s data snapshots, increases the SNR of the passive fathometer response.
Details
- Title: Subtitle
- Coherent averaging of the passive fathometer response using short correlation time
- Creators
- James Traer - Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California 92093-0238Peter Gerstoft - Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California 92093-0238
- Resource Type
- Journal article
- Publication Details
- The Journal of the Acoustical Society of America, Vol.130(6), pp.3633-3641
- DOI
- 10.1121/1.3654026
- PMID
- 22225020
- NLM abbreviation
- J Acoust Soc Am
- ISSN
- 0001-4966
- eISSN
- 1520-8524
- Publisher
- American Institute of Physics
- Grant note
- N00014-08-1-0196 / ONR N00014-11-1-0320 / ONR
- Date published
- 12/2011
- Academic Unit
- Psychological and Brain Sciences; Iowa Neuroscience Institute
- Record Identifier
- 9984065369902771
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