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IEE Colloquium on Recent Developments in Radar and Sonar Imaging Systems: What Next?

12 Dec 1995

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Displaying Results 1 - 10 of 10
  • Improving acoustical fishing aids for small fishing vessels

    Publication Year: 1995, Page(s):2/1 - 2/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    This paper discusses the problem of integrating data from the acoustical displays of pelagic trawlers in order to position the net so that the catch is maximised. The associated secondary problem of reducing the number of visual display units (VDUs) in the wheelhouse is also discussed where relevant. In order to help the skipper, an echosounder is used to ascertain the vertical depth of water bene... View full abstract»

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  • Reconstruction of sonar images using computerised tomography

    Publication Year: 1995, Page(s):4/1 - 4/9
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (896 KB)

    A trials programme undertaken by the Defence Research Agency, Bincleaves, has collected high resolution sonar echoes from objects placed on a turntable. The availability of all round views of the objects allows a tomographic image to be reconstructed. The trials procedure is described and examples of echo data from a rock and a representative cylindrical ground mine presented. The way an image may... View full abstract»

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  • Radar and sonar imaging-a tutorial introduction

    Publication Year: 1995, Page(s):1/1 - 1/7
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    Aperture synthesis is one of the most important techniques in radar and sonar imaging. Applied to radar and sonar, the techniques of aperture synthesis have interesting similarities and differences. Many of the differences are associated with the much lower velocity of propagation in the sonar case, but also, variations in temperature and salinity of seawater cause reflection and bending of the ra... View full abstract»

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  • Recent developments in ground-based, polarimetric synthetic aperture radar imaging at the University of Sheffield

    Publication Year: 1995, Page(s):8/1 - 8/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (312 KB)

    The authors describe various aspects of a programme of research directed towards the development of a ground-based polarimetric synthetic aperture radar (GB-SAR). The system will be of value in providing a better understanding of the vast amounts of image data being generated by current and future airborne and spaceborne SAR platforms. This attribute arises from the ability of the system to produc... View full abstract»

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  • Spaceborne SAR autofocus

    Publication Year: 1995, Page(s):11/1 - 1111
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (856 KB)

    Low Earth orbit provides an ideal operating environment for synthetic aperture radar (SAR) imaging due to well-defined platform motion. Airborne SAR platforms do not benefit from this luxury and suffer unpredictable motions causing image defocusing. Autofocus is a widely acknowledged technique for correcting these motions, causing the image to be properly focused. Accurate position and velocity in... View full abstract»

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  • Towards estimates of zooplankton abundance and size distribution using sonar

    Publication Year: 1995, Page(s):3/1 - 3/2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (152 KB)

    To provide a system capable of insonifying zooplankton continuously and routinely at high speed, concurrently with other environmental parameters, we are developing a novel multifrequency system operating over a range of 200 kHz to 2 MHz, integrated within the existing IOSDL SeaSoar vehicle which currently carries a CTD, fluorometer, light and nitrate sensors. The frequency range will cover sizes ... View full abstract»

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  • Pixel based sonar imaging

    Publication Year: 1995, Page(s):5/1 - 5/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (332 KB)

    Many existing commercial sonar systems for sub-sea application are design specific with only one application or deployment mode employing a specific array configuration. The imaging concept moves away from the traditional beamsteering and multi-beam techniques by a digital focused beamforming operation (DFB) for pixel based imaging in any co-ordinate system. The sonar itself is considered simply a... View full abstract»

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  • The DRA despeckling algorithm

    Publication Year: 1995, Page(s):9/1 - 9/6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (704 KB)

    We present an algorithm that is able to smooth out the speckle from many different kinds of SAR images and which does not suffer from the drawbacks of multilooking. The algorithm is able to preserve the detail and resolution of the original image while producing a smooth, real valued output. In many cases the quality of the smoothed image is sufficiently high that it may be used with standard opti... View full abstract»

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  • An analytical correlation and comparison of high resolution side-scan sonar imagery and multi-beam bathymetry

    Publication Year: 1995, Page(s):6/1 - 6/7
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (532 KB)

    Deep towed side-scan sonar vehicles acquire high quality imagery of the seafloor morphology with very high spatial resolution but poor overall locational accuracy. Correlation and comparison of the side-scan sonar data (TOBI) with bathymetry data is highly desirable to enhance seafloor modelling, and to derive further geological interpretations which were previously hidden or confused. It also imp... View full abstract»

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  • High resolution SAR clutter textural analysis

    Publication Year: 1995, Page(s):10/1 - 10/9
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (748 KB)

    Coherent images of natural scenes formed using synthetic aperture radar (SAR) often possess textural properties associated with the clutter. Due to an improvement in the Defence Research Agency (DRA) X-band SAR, very high resolution imagery is now available for analysis. This increase in resolution has visibly modified the textural properties of observed clutter forcing a re-examination of the sta... View full abstract»

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