Azimuth ambiguities in broadside and squint mode synthetic aperture sonar

R. McHugh, S. Shaw, N. Taylor

Research output: Contribution to journalArticle

Abstract

Synthetic aperture sonar (SAS) mapping rates are limited by acoustic propagation speed in relation to feasible platform velocity and the desired swath coverage. Such limitations result in azimuth undersampling and the appearance of ambiguities in SAS imagery. The position, spreading and ambiguity to signal ratio (ASR) of image aliases caused by grating lobes are discussed from a geometric and a Doppler point of view. Simulation and experimentation for sidelooking SAS imaging show the variation in ASR with along track sampling, processed aperture, target range, and transmitted signal bandwidth. ASR is also shown to improve with increasing SAS squint angle considered up to 60° from broadside.

Original languageEnglish
Pages (from-to)113-119
Number of pages7
JournalIEE Proceedings - Radar, Sonar and Navigation
Volume146
Issue number2
DOIs
Publication statusPublished - 1999

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sonar
azimuth
sonar imagery
acoustics
sampling
simulation

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McHugh, R. ; Shaw, S. ; Taylor, N. / Azimuth ambiguities in broadside and squint mode synthetic aperture sonar. In: IEE Proceedings - Radar, Sonar and Navigation. 1999 ; Vol. 146, No. 2. pp. 113-119.
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Azimuth ambiguities in broadside and squint mode synthetic aperture sonar. / McHugh, R.; Shaw, S.; Taylor, N.

In: IEE Proceedings - Radar, Sonar and Navigation, Vol. 146, No. 2, 1999, p. 113-119.

Research output: Contribution to journalArticle

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T1 - Azimuth ambiguities in broadside and squint mode synthetic aperture sonar

AU - McHugh, R.

AU - Shaw, S.

AU - Taylor, N.

PY - 1999

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AB - Synthetic aperture sonar (SAS) mapping rates are limited by acoustic propagation speed in relation to feasible platform velocity and the desired swath coverage. Such limitations result in azimuth undersampling and the appearance of ambiguities in SAS imagery. The position, spreading and ambiguity to signal ratio (ASR) of image aliases caused by grating lobes are discussed from a geometric and a Doppler point of view. Simulation and experimentation for sidelooking SAS imaging show the variation in ASR with along track sampling, processed aperture, target range, and transmitted signal bandwidth. ASR is also shown to improve with increasing SAS squint angle considered up to 60° from broadside.

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DO - 10.1049/ip-rsn:19990260

M3 - Article

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JO - IEE Proceedings - Radar, Sonar and Navigation

JF - IEE Proceedings - Radar, Sonar and Navigation

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