Synthetic aperture sonar for seabed imaging: relative merits of narrow-band and wide-band approached

Châtillon, Jacques; Bouhier, Marie Edith; Zakharia, Manell E.

doi:10.1109/48.126958

Cited by 56 publications

(25 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ACID sonar uses time delay correction in order to focus the array, in contrast to the phase corrections used by synthetic aperture radar processing. This is necessary due to the wideband nature of the ACID sonar compared with the narrowband operation [7] of synthetic aperture radars. For each range interval, the returns are summed according to the synthetic aperture length at that range and according to the quadratic delay of the signals.,The number of operations performed per second by the synthetic aperture processing system are given by (3), and the memory requirement is given by (4).…”

Section: Synthetic Aperture Processingmentioning

confidence: 98%

Real-time synthetic aperture sonar imaging using a parallel architecture

Riyait

Lawlor

Adams

et al. 1995

IEEE Trans. on Image Process.

View full text Add to dashboard Cite

This paper describes a parallel architecture that has been developed to perform real-time synthetic aperture sonar imaging as part of the Acoustical Imaging Development (ACID) project. The project has successfully developed a synthetic aperture sonar system for producing high resolution images of the sea floor and that has been tested during a series of sea trials in May 1993 off the south coast of France. This paper describes the synthetic aperture processing system developed by the University of Newcastle upon Tyne and its use of transputer modules and associated devices in order to obtain real-time imaging performance, the software structure of the processing system and the load balancing techniques that have been developed in order to provide efficient processing. The use of a parallel distributed architecture has also allowed a processing system that can readily be extended to deliver greater computational power in the future. Images produced by the synthetic aperture processor from data collected from around the Toulon coastal region are presented. These images highlight the improvement in azimuth resolution that can be obtained from synthetic aperture processing over conventional sidescan sonars.

show abstract

Section: Synthetic Aperture Processingmentioning

confidence: 98%

Real-time synthetic aperture sonar imaging using a parallel architecture

Riyait

Lawlor

Adams

et al. 1995

IEEE Trans. on Image Process.

View full text Add to dashboard Cite

show abstract

“…Application fields may be found in radar imaging of the earth [1], sonar imaging of the ocean bed [2], seismic imaging of the earth's crust [3] as well as in medical application based on ultrasound imaging systems [4].…”

Section: Introductionmentioning

confidence: 99%

3D reflectivity reconstruction by means of spatially distributed Kalman Filters

Schwarzenberg

Mayer

Ruiter

et al. 2008

2008 IEEE International Conference on Multisensor Fusion and Integration for Intelligent Systems

View full text Add to dashboard Cite

Abstract-In seismic, radar, and sonar imaging the exact determination of the reflectivity distribution is usually intractable so that approximations have to be applied. A method called synthetic aperture focusing technique (SAFT) is typically used for such applications as it provides a fast and simple method to reconstruct (3D) images. Nevertheless, this approach has several drawbacks such as causing image artifacts as well as offering no possibility to model system-specific uncertainties.In this paper, a statistical approach is derived, which models the region of interest as a probability density function (PDF) representing spatial reflectivity occurrences. To process the nonlinear measurements, the exact PDF is approximated by well-placed Extended Kalman Filters allowing for efficient and robust data processing.The performance of the proposed method is demonstrated for a 3D ultrasound computer tomograph and comparisons are carried out with the SAFT image reconstruction.

show abstract

“…It is an accurate formal description of the image generation. With some exceptions e.g., [4], this point of view has not received much attention in sonar literature.…”

Section: Range)mentioning

confidence: 96%

“…In narrowband systems, the beam pattern is evaluated at the stationaFj phase points. Using wideband signals, a wideband directivity pattern can be defined based on the angular energy distribution of the array [4]. Equation (10) is a consequence of (7) and describes both cases.…”

Section: Sas Ima(g1ng Examplesmentioning

confidence: 99%

Space-time analysis and iterative focusing for synthetic aperture sonar

Ochieng-Ogolla

Proceedings of 3rd IEEE International Conference on Image Processing

View full text Add to dashboard Cite

In this paper, we describe a space-time analysis for synthetic aperture sonar (SAS) employing Green's functions (GF), and show that it's basically an inverse problem. Iterative focusing is proposed based on this viewpoint. In order to mitigate difficulties of slow convergence and computational costs inherent in iterative methods (IM), an acceleration technique is used. Applications to SAS imaging is demonstrated through reconstructions from simulated data, with emphasis on high resolution and iimage quality.

show abstract

Synthetic aperture sonar for seabed imaging: relative merits of narrow-band and wide-band approached

Cited by 56 publications

References 9 publications

Real-time synthetic aperture sonar imaging using a parallel architecture

Real-time synthetic aperture sonar imaging using a parallel architecture

3D reflectivity reconstruction by means of spatially distributed Kalman Filters

Space-time analysis and iterative focusing for synthetic aperture sonar

Contact Info

Product

Resources

About