A correction of synthetic aperture sonar image using the redundant phase center technique and phase gradient autofocus

Jungsoo Ryue; Kyungmin Baik

doi:10.7776/ASK.2021.40.6.546

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2021 Vol.40, Issue 6 Preview Page Next Page

Review Article

A correction of synthetic aperture sonar image using the redundant phase center technique and phase gradient autofocus Redundant phase center 기법과 phase gradient autofocus를 이용한 합성개구소나 영상 보정

30 November 2021. pp. 546-554

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Abstract

In the signal processing of synthetic aperture sonar, it is subject that the platform in which the sensor array is installed moves along the straight line path. In practical operation in underwater, however, the sensor platform will have trajectory disturbances, diverting from the line path. It causes phase errors in measured signals and then produces deteriorated SAS images. In this study, in order to develop towed SAS, as tools to remove the phase errors associated with the trajectory disturbances of the towfish, motion compensation technique using Redundant Phase Center (RPC) and also Phase Gradient Autofocus (PGA) method is investigated. The performances of these two approaches are examined by means of a simulation for SAS system having a sway disturbance.

Keywords

Synthetic Aperture Sonar (SAS)

Redundant Phase Center (RPC)

Phase Gradient Autofocus (PGA)

Motion compensation

수중 탐지를 위한 합성개구소나(Synthetic Aperture Sonar, SAS) 신호처리에서는 탑재플랫폼이 직선경로를 따라 주행한다고 가정한다. 그러나 실제로는 플랫폼의 복잡한 운동에 따른 궤적 교란으로 인해 SAS 영상에 번짐과 같은 왜곡이 발생한다. 본 연구에서는 예인형 SAS 개발을 위해 궤적 교란에 의한 SAS 영상 왜곡을 개선하기 위한 방법으로서, Redundant Phase Center (RPC)을 이용한 예인체 운동 추정 및 영상 보정, 그리고 자동 초점 기법인 Phase Gradient Autofocus (PGA) 기법에 대해 검토하였다. 그리고 시뮬레이션을 통해, sway로 인해 왜곡된 SAS 영상에 이 기법들을 적용하고 그 성능 및 유효성에 대해 살펴보았다.

키워드

합성개구소나(Synthetic Aperture Sonar, SAS)

Redundant Phase Center (RPC)

Phase Gradient Autofocus (PGA)

운동 보정

References

D. W. Hawkins, Synthetic aperture imaging algorithms: with application to wide bandwidth sonar (Ph.D. Thesis, University of Canterbury, New Zealand, 1996).

H. J. Callow, Signal processing for synthetic aperture image enhancement (Ph.D. Thesis, University of Canterbury, New Zealand, 2003).

D. R. Wilkinson, Efficient image reconstruction technique for a multiple-receiver synthetic aperture sonar (M.Eng. Thesis, University of Canterbury, New Zealand, 2001).

W. W. Bonifant, Jr, Interferometic synthetic aperture sonar processing (M.Sc. Thesis, Georgia Institute of Technology, US, 1999).

D. A. Cook, Synthetic aperture sonar motion estimation and compensation (M.Sc. Thesis, Georgia Institute of Technology, US, 2007).

C. V. Jakowatz, D. E. Wahl, P. H. Eichel, D. C. Ghiglia, and P. A. Thompson, Spotlight-Mode Synthetic Aperture Rador: A Signal Processing Approach (Springer, New York, 1996), pp. 251-271. 10.1007/978-1-4613-1333-5

S. M. Kim and S. H. Byun, "A quantitative analysis of synthetic aperture sonar image distortion according to sanar platform motion parameters" (in Korean), J. Acoust. Soc. Kr. 40, 382-390 (2021) .

M. P. Hayes and P. T. Gough, "Broad-band synthetic aperture sonar," IEEE J. Ocean. Eng. 17, 80-94 (1992). 10.1109/48.126957

Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 40
No :6
Pages :546-554
Received Date : 2021-08-31
Revised Date : 2021-09-27
Accepted Date : 2021-10-07
DOI :https://doi.org/10.7776/ASK.2021.40.6.546

The Journal of the Acoustical Society of Korea ISSN:1225-4428(Print) 2287-3775(Online) 한국음향학회지

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