Sperm Whale Impulse Noise and Incoherent Narrowband CFAR Processing
Impulsive noise interference of a biological origin is common in underwater acoustic environments. Here we report on properties of impulsive noise produced by sperm whales, recorded in deep water off the coast of Manus Island. We analyze the noise as a function of frequency band, and find strong non...
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ftdtic:ADA411913 2023-05-15T18:26:49+02:00 Sperm Whale Impulse Noise and Incoherent Narrowband CFAR Processing Bertilone, Derek Killeen, Damien DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) MARITIME OPERATIONS DIV 2002-10 text/html http://www.dtic.mil/docs/citations/ADA411913 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA411913 en eng http://www.dtic.mil/docs/citations/ADA411913 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Acoustics Radiofrequency Wave Propagation *IMPULSE NOISE *UNDERWATER ACOUSTICS *WHALES SIMULATION DETECTION PERFORMANCE(ENGINEERING) PROCESSING THRESHOLD EFFECTS THEORY SIGNAL TO NOISE RATIO PROCESSING EQUIPMENT INCOHERENCE FREQUENCY BANDS MATHEMATICAL FILTERS NONLINEAR SYSTEMS SIGNALS INTERFERENCE NOISE AUSTRALIA DEEP WATER SONAR NARROWBAND RAYLEIGH WAVES FADING(ELECTROMAGNETIC WAVES) AQ F03-06-1400 FOREIGN REPORTS Text 2002 ftdtic 2016-02-21T05:15:21Z Impulsive noise interference of a biological origin is common in underwater acoustic environments. Here we report on properties of impulsive noise produced by sperm whales, recorded in deep water off the coast of Manus Island. We analyze the noise as a function of frequency band, and find strong non-Gaussian effects in the range 1-6 kHz. Sonar performance can be improved by utilizing nonlinear filtering techniques from non-Gaussian detection theory. We demonstrate this by measuring empirical gains for a constant false-alarm rate (CPAR) incoherent narrowband processor. We investigate both parametric locally optimum and nonparametric filtering of the time-domain data to enhance weak signal detection. Simulated Rayleigh fading signals were inserted into the noise data, and the detection threshold was found to be lowered by about 4 dB over conventional processing, for signal frequencies 1.5 kHz and 4.5 kHz and a false-alarm probability of 0.0001. Performance degradations can potentially occur at large signal-to-noise ratios, but these were mitigated using a simple technique for fusing the non-Gaussian processor with a conventional processor. Text Sperm whale Defense Technical Information Center: DTIC Technical Reports database |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
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English |
topic |
Acoustics Radiofrequency Wave Propagation *IMPULSE NOISE *UNDERWATER ACOUSTICS *WHALES SIMULATION DETECTION PERFORMANCE(ENGINEERING) PROCESSING THRESHOLD EFFECTS THEORY SIGNAL TO NOISE RATIO PROCESSING EQUIPMENT INCOHERENCE FREQUENCY BANDS MATHEMATICAL FILTERS NONLINEAR SYSTEMS SIGNALS INTERFERENCE NOISE AUSTRALIA DEEP WATER SONAR NARROWBAND RAYLEIGH WAVES FADING(ELECTROMAGNETIC WAVES) AQ F03-06-1400 FOREIGN REPORTS |
spellingShingle |
Acoustics Radiofrequency Wave Propagation *IMPULSE NOISE *UNDERWATER ACOUSTICS *WHALES SIMULATION DETECTION PERFORMANCE(ENGINEERING) PROCESSING THRESHOLD EFFECTS THEORY SIGNAL TO NOISE RATIO PROCESSING EQUIPMENT INCOHERENCE FREQUENCY BANDS MATHEMATICAL FILTERS NONLINEAR SYSTEMS SIGNALS INTERFERENCE NOISE AUSTRALIA DEEP WATER SONAR NARROWBAND RAYLEIGH WAVES FADING(ELECTROMAGNETIC WAVES) AQ F03-06-1400 FOREIGN REPORTS Bertilone, Derek Killeen, Damien Sperm Whale Impulse Noise and Incoherent Narrowband CFAR Processing |
topic_facet |
Acoustics Radiofrequency Wave Propagation *IMPULSE NOISE *UNDERWATER ACOUSTICS *WHALES SIMULATION DETECTION PERFORMANCE(ENGINEERING) PROCESSING THRESHOLD EFFECTS THEORY SIGNAL TO NOISE RATIO PROCESSING EQUIPMENT INCOHERENCE FREQUENCY BANDS MATHEMATICAL FILTERS NONLINEAR SYSTEMS SIGNALS INTERFERENCE NOISE AUSTRALIA DEEP WATER SONAR NARROWBAND RAYLEIGH WAVES FADING(ELECTROMAGNETIC WAVES) AQ F03-06-1400 FOREIGN REPORTS |
description |
Impulsive noise interference of a biological origin is common in underwater acoustic environments. Here we report on properties of impulsive noise produced by sperm whales, recorded in deep water off the coast of Manus Island. We analyze the noise as a function of frequency band, and find strong non-Gaussian effects in the range 1-6 kHz. Sonar performance can be improved by utilizing nonlinear filtering techniques from non-Gaussian detection theory. We demonstrate this by measuring empirical gains for a constant false-alarm rate (CPAR) incoherent narrowband processor. We investigate both parametric locally optimum and nonparametric filtering of the time-domain data to enhance weak signal detection. Simulated Rayleigh fading signals were inserted into the noise data, and the detection threshold was found to be lowered by about 4 dB over conventional processing, for signal frequencies 1.5 kHz and 4.5 kHz and a false-alarm probability of 0.0001. Performance degradations can potentially occur at large signal-to-noise ratios, but these were mitigated using a simple technique for fusing the non-Gaussian processor with a conventional processor. |
author2 |
DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) MARITIME OPERATIONS DIV |
format |
Text |
author |
Bertilone, Derek Killeen, Damien |
author_facet |
Bertilone, Derek Killeen, Damien |
author_sort |
Bertilone, Derek |
title |
Sperm Whale Impulse Noise and Incoherent Narrowband CFAR Processing |
title_short |
Sperm Whale Impulse Noise and Incoherent Narrowband CFAR Processing |
title_full |
Sperm Whale Impulse Noise and Incoherent Narrowband CFAR Processing |
title_fullStr |
Sperm Whale Impulse Noise and Incoherent Narrowband CFAR Processing |
title_full_unstemmed |
Sperm Whale Impulse Noise and Incoherent Narrowband CFAR Processing |
title_sort |
sperm whale impulse noise and incoherent narrowband cfar processing |
publishDate |
2002 |
url |
http://www.dtic.mil/docs/citations/ADA411913 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA411913 |
genre |
Sperm whale |
genre_facet |
Sperm whale |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA411913 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766208783373041664 |