IEE Proceedings F - Radar and Signal Processing

Issue 2 • Apr 1990

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Displaying Results 1 - 13 of 13
  • Radar sea-clutter at low grazing angles

    Publication Year: 1990, Page(s):102 - 112
    Cited by:  Papers (43)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (732 KB)

    An analysis of sea-clutter data obtained in conditions typical of sea state 2 at X-, S-, L- bands, UHF and VHF is presented. Results show that sea-clutter exhibits very different spectral characteristics at higher frequencies compared to those at low frequencies. Experimental sea-clutter coefficients as a function of grazing angle at various frequency bands were obtained for upswell and cross-swel... View full abstract»

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  • Low-grazing-angle radar backscatter from the ocean surface

    Publication Year: 1990
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (400 KB)

    A series of simultaneous, low-grazing-angle (<0.1°) radar backscatter measurements were made with the L-, S- and C-band radars located on the Island of Roi-Namur, Kwajalein, MI. Using a variety of waveforms, coherent data were recorded in contiguous 1.26 km steps from 8 to 60 km ranges in sea state 3 and state 5 conditions. The author presents new, detailed spectral measurements at very low... View full abstract»

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  • Experimental study of nonstationary X- and Q-band radar backscattering from the sea surface

    Publication Year: 1990, Page(s):118 - 124
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    An experimental study of the spectral and polarisation characteristics of microwave radar return from breaking sea is presented. The measurements were made using an X- and Q-band coherent CW radar system. The transmitted electromagnetic wave was either vertically or horizontally polarised but both orthogonal components were received. Measurements were made from a platform at a grazing angle of 6&d... View full abstract»

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  • Influence of evaporation ducts on radar sea return

    Publication Year: 1990, Page(s):80 - 88
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (592 KB)

    Modelling of radar sea return is discussed with consideration of propagation conditions. Both the intensity and propagation direction of energy incident at the sea surface can be significantly affected by the refractive condition of the atmosphere. The authors describe and evaluate a model that incorporates both of these effects for the situation where the propagation conditions are characterised ... View full abstract»

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  • Oceanic precipitation rate climatology

    Publication Year: 1990, Page(s):125 - 132
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (836 KB)

    Precipitation is an important source of interference and obscuration to many types of sensors employed for ocean surveillance. Radar attenuation and backscatter due to rain become significant for radar wavelengths less than several centimetres and are sensitive functions of the rain rate. Rain frequency data are also important in the design of supersonic vehicles since rain erosion is related to r... View full abstract»

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  • Timely prediction of low-altitude radar performance in operational environments using in situ atmospheric refractivity data

    Publication Year: 1990, Page(s):89 - 94
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (536 KB)

    A shipboard radar decision aid that may be used to predict low-altitude radar performance and assist the radar operator in maximising system capabilities in the existing propagation environment is discussed. The system, developed for use aboard US Navy AEGIS-class ships, uses expendable rocketborne radiosondes to make high-resolution measurements of the atmosphere. A version of the Johns Hopkins U... View full abstract»

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  • Open ocean bird migration

    Publication Year: 1990, Page(s):133 - 137
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (440 KB)

    A large body of indirect evidence suggests that migrant birds may constitute a significant proportion of the coherent airborne radar echoes detected at sea. Shipboard and island-based radars frequently detect large numbers of small cross-section targets moving at angles to the wind. Calculated airspeeds of these echoes are between 25 and 100 km/h (7-28 ms-1). Radar ornithologists have c... View full abstract»

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  • Maritime surveillance radar. I. Radar scattering from the ocean surface

    Publication Year: 1990, Page(s):51 - 62
    Cited by:  Papers (77)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (848 KB)

    The successful optimisation of the detection performance of maritime surveillance radars requires a detailed knowledge and understanding of both forward and backscattering from the ocean surface. Such an understanding enables the development of suitable signal processing techniques. In part I the authors discuss radar scattering from an ocean environment. It is shown, through the analysis of full-... View full abstract»

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  • Sea surface effects on the radar return from a periscope

    Publication Year: 1990, Page(s):149 - 156
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (472 KB)

    A physically motivated model of the radar signal return from a submarine periscope in the sea is proposed. The periscope is modelled in terms of a metal cylinder, and the way in which this reflector combines with the rough sea surface is described. The results are given in terms of simple Swerling-type targets as far as possible, in order that the implications for radar performance can be easily e... View full abstract»

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  • Radar coverage assessment in nonstandard and ducting conditions: a geometrical optics approach

    Publication Year: 1990, Page(s):95 - 101
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (476 KB)

    The authors set out to show that geometrical optics (GO) is particularly suitable for the real-time accurate computation of radar coverages in nonstandard atmospheres. A somewhat unusual GO differential system is used for predicting both ray paths and complex propagated fields within regular media. Optimal reductions of that formalism are obtained according to symmetry properties of the atmosphere... View full abstract»

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  • Method for modelling sea surface clutter in complicated propagation environments

    Publication Year: 1990, Page(s):73 - 79
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (572 KB)

    An approach for predicting clutter levels in complicated propagation conditions using an advanced propagation model and one of several empirical clutter cross-section models is described. Incident power and grazing angle information is obtained using a parabolic equation/Fourier split-step technique to predict the distribution of energy in complicated, range-varying environments. Such environments... View full abstract»

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  • Progress in the interpretation of HF sea echo: HF radar as a remote sensing tool

    Publication Year: 1990, Page(s):139 - 147
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (564 KB)

    When HF radar systems are used for surveillance or tracking of ships or aircraft the strong signal from the ocean surface is termed clutter since it obscures the required signals. Clutter characteristics are related to the ocean ware spectrum leading to HF radar being used for remote sensing. The author describes work on the inversion of the Doppler spectrum of HF radar echoes from the ocean surfa... View full abstract»

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  • Maritime surveillance radar. II. Detection performance prediction in sea clutter

    Publication Year: 1990, Page(s):63 - 72
    Cited by:  Papers (13)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (740 KB)

    For pt.I see ibid., vol.137, pt.F, no.2, p.51-62 (1990). Techniques for detection performance prediction for maritime surveillance radars are described, with particular emphasis on the use of the compound K-distribution model for radar sea clutter. The authors briefly review the analytical methods for deriving theoretical detection performance limits using compound models for both clutter and targ... View full abstract»

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The latest version of this title is Radar, Sonar & Navigation, IET.

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