&lt;title&gt;High-frequency/low-frequency synthetic aperture sonar&lt;/title&gt;

Sammelmann, Gary S.; Fernandez, Jose E.; Christoff, James T.; Vaizer, L.; Lathrop, John D.; Sheriff, Robert W.; Montgomery, Thomas C.

doi:10.1117/12.280850

Cited by 20 publications

(6 citation statements)

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“…Medium stability for synthetic aperture sonar system is a major issue, but has been proved to be not restraining factor for the application of this technique ( ). Most active synthetic aperture sonar systems are still in the research and development stage ([Douglas, B. L.;Lee, H. (1993); Neudorfer, M. et al (1996); Sammelmann, G. S. et al (1997); Nelson, M. A. (1998); Chatillon, J. et al (1999)]) but this technology is starting to emerge as a commercially advantageous technology ( [Hansen, R.E.…”

Section: Overview Of Current Systemsmentioning

confidence: 99%

Advances in Sonar Technology

Silva¹

2009

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The demand to explore the largest and also one of the richest part of our planet, the advances in signal processing promoted by an exponential growth in computation power and a thorough study of sound propagation in the underwater realm, lead to remarkable advances in sonar technology in the last years.Since the use of imaging system that rely on electromagnetic waves (optical, laser or radar) is restricted to only very shallow water environments, and given that the good propagation of sound waves in water is known from at least the writings of Leonardo da Vinci, the sonar (sound navigation and raging) systems are the most widespread solution for underwater remote sensing.Sonar systems can be divided into two major types: passive sonar systems that enable detection of a sound emitting target and active sonar systems that use the properties of a signal reflected on the targets for its detection and image formation.As system complexity increases, the study of the way sound is used to obtain reflectivity and bathymetry data from targets and submersed areas becomes fundamental in the performance prediction and development of innovative sonar systems.Because of the many similarities between sonar and radar, algorithms created for the latter found application in sonar systems which made use of the advances in signal processing to overcome the barriers of the problematic underwater propagation medium and to challenge the resolution limits. In particular, synthetic aperture methods, applied with so much success in radar imagery, were adapted to sonar systems. This in turn enabled a considerable increase in sonar image quality and system robustness. Target detection developments lead to the use of multiple transducer sensors and sophisticated beam forming techniques with also excellent results.High quality sonar imagery with reduced noise and enhanced resolution enables more complex applications. Leaving the traditional real of military applications, sonar civil applications arise for the study of biology ecology and related fields. Moreover integration and data fusion of different sensors is becoming more and more common, being it navigation data integration and enhancement for synthetic aperture, sonar systems with different propagation characteristics or optical image integration for the improvement of object detection.But, not unlike natural evolution, a technology that matured in the underwater environments is now being used to solve problems for robots that use the echoes from airacoustic signals to derive their sonar signals.The work on hand is a sum of knowledge of several authors that contributed in various different aspects of sonar technology. This book intends therefore to give a broad overview of the advances in sonar technology of the last years that resulted from the research effort of the authors in both sonar systems and its applications. It is destined to scientist and VIII engineers from a variety of backgrounds and, hopefully, even those that never had contact with sonar technology before will find an ...

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Section: Overview Of Current Systemsmentioning

confidence: 99%

Advances in Sonar Technology

Silva¹

2009

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“…Medium stability for synthetic aperture sonar system is a major issue, but has been proved to be not restraining factor for the application of this technique ( [Gough, P. T. et al (1989)]). Most active synthetic aperture sonar systems are still in the research and development stage ( [Douglas, B. L.;Lee, H. (1993); Neudorfer, M. et al (1996); Sammelmann, G. S. et al (1997); Nelson, M. A. (1998); Chatillon, J. et al (1999)]) but this technology is starting to emerge as a commercially advantageous technology ( [Hansen, R.E.…”

Section: Overview Of Current Systemsmentioning

confidence: 99%

Synthetic Aperture Techniques for Sonar Systems

Silva¹,

Cunha²,

Matos³

et al. 2009

Advances in Sonar Technology

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“…Before getting to the details of the CSS system, it would be beneficial to discuss the ways in which AUV platforms behave differently than towed platforms. Since 1996, the CSS LF/HF SAS system has been operated from a 21" diameter towed body with active control surfaces [2], [3]. The overall length of this body varied depending upon the mission configuration, but was on average approximately 25' long.…”

Section: Auv Vs Towed Sas Systemsmentioning

confidence: 99%

Motion compensation of AUV-based synthetic aperture sonar

Cook

Christoff

Fernandez

2003

Oceans 2003. Celebrating the Past ... Teaming Toward the Future (IEEE Cat. No.03CH37492)

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To date, ocean-going synthetic aperture sonar (SAS) systems have been deployed exclusively in a configuration where the sonar instrument is housed in a towed body that receives power from and exchanges information with the vessel to which it is attached. Meanwhile, recent years have witnessed the beginnings of maturity with respect to both SAS and autonomous underwater vehicle (AUV) technologies. In order to move away from the towed sonar paradigm, the Coastal Systems Station has recently taken delivery of and begun using the first AUV-based SAS. The AUV was manufactured by Bluefin Robotics and the sonar used on this vehicle is the existing CSS LF/HF SAS. This transition is not without its challenges, however, as the operation and dynamic behavior of an AUV is different from that of a towed body. In general, the AUV configuration makes the problem of unwanted platform motion more severe and more difficult to solve. This paper discusses motion compensation in the context of initial evaluations of the performance of the CSS AUV-based SAS system.

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<title>High-frequency/low-frequency synthetic aperture sonar</title>

Cited by 20 publications

References 0 publications

Advances in Sonar Technology

Advances in Sonar Technology

Synthetic Aperture Techniques for Sonar Systems

Motion compensation of AUV-based synthetic aperture sonar

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