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Communications, Radar and Signal Processing, IEE Proceedings F

Issue 7 • December 1983

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Displaying Results 1 - 13 of 13
  • Propagation and scattering in MF/HF groundwave radar

    Publication Year: 1983, Page(s):579 - 590
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1551 KB)

    Vertically polarised MF/HF groundwave radar has been used over the frequency range 2¿¿30 MHz for sea-state sensing, surface-current measurement and ship tracking. The paper reviews the propagation factors and noise environment which control the performance of such systems. The various definitions of antenna gain, propagation loss and sea backscattering coefficient are discussed and related to phys... View full abstract»

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  • Scattering from a random layer with applications to snow, vegetation and sea ice

    Publication Year: 1983, Page(s):591 - 600
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1059 KB)

    Two approaches for computing scattering from a random layer with an irregular interface are shown using the radiative-transfer principle. One approach is applied to a random layer to develop a scattering model for snow and sea ice, while the other is used to generate a scattering model for vegetation. It is noted that to model the scattering characteristics of a special medium, it is necessary to ... View full abstract»

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  • Statistical theory of scattering and propagation over a random surface

    Publication Year: 1983, Page(s):601 - 622
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2670 KB)

    First, a systematic theory is developed for a deterministic surface upon introduction of a surface Green function defined on a reference plane of the rough surface and determined by an equivalent surface impedance. The surface impedance is obtained by an exact transformation of a given boundary equation on the real boundary surface onto the reference plane and is given explicitly in an operator fo... View full abstract»

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  • Natural focusing and catastrophes

    Publication Year: 1983, Page(s):623 - 629
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1200 KB)

    Contrived focusing is achieved by the disturbance of waves by man-made devices such as lenses or antenna dishes, and the theory of the process is well established. Natural focusing or caustics, on the other hand, are produced in waves subjected to natural, or nonspecial, disturbance such as propagation through an irregular medium or reflection from an irregular surface. The appropriate theory of s... View full abstract»

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  • Duct propagation modelling for the integrated-refractive-effects prediction system (IREPS)

    Publication Year: 1983, Page(s):630 - 642
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1578 KB)

    This paper reviews IREPS and some of its major products, and follows with a description of a recent effort to improve IREPS signal-prediction capabilities in tropospheric ducting environments. The IREPS products discussed are the altitude-versus-range coverage display, the path-loss-versus-range display, and a new historical propagation-conditions summary display derived from a computer-based refr... View full abstract»

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  • Radiosonde errors and spurious surface-based ducts

    Publication Year: 1983, Page(s):643 - 648
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (845 KB)

    Substantially more frequent occurrences of surface-based super-refractive and ducting layers have been noted in daytime than in night-time refractive climatological data derived from standard United States radiosondes. Evidence is presented which indicates that the diurnal bias in these data is largely fictitious. Although the problem is fundamentally a consequence of vulnerability of the carbon h... View full abstract»

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  • Consideration of the usefulness of microwave propagation prediction methods on air-to-ground paths

    Publication Year: 1983, Page(s):649 - 656
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1193 KB)

    Air-to-ground propagation paths are used by many microwave equipments such as sensors, counter-measures and communications. Prediction methods for the coverage of these equipments have been studied elsewhere using powerful numerical modelling techniques. A fundamental consideration is the availability of sufficient and accurate atmospheric data. A review of the possible measurement techniques is g... View full abstract»

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  • Propagation due to tropospheric inhomogeneities

    Publication Year: 1983, Page(s):657 - 664
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1074 KB)

    Above about 30 MHz the only tropospheric-propagation mechanism giving a significant field strength far beyond the radio-horizon is the scattering of radiowaves by tropospheric inhomogeneities. This mechanism has been extensively studied and has given rise to discussions between theoreticians, especially during the years 1950 to 1965. From that time, studies have been continued at a lower rate, and... View full abstract»

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  • Review of slant path propagation mechanisms and their relevance to systems performance

    Publication Year: 1983, Page(s):665 - 678
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2234 KB)

    The purpose of the paper is to present a broad overview of propagation effects for frequencies predominantly within the 30 MHz to optical range, but excluding detailed discussion of depolarisation mechanisms which have been reviewed elsewhere. Emphasis is placed on atmospheric effects of direct relevance to systems design and operation, particularly for satellite communication systems. The topics ... View full abstract»

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  • Tropospheric effects on line-of-sight links at 36 GHz and 55 GHz

    Publication Year: 1983, Page(s):679 - 687
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1068 KB)

    Experimental results obtained on two line-of-sight links at 36 GHz and 55 GHz operating on a 4 km path across central London are summarised. Measurements confirm the predicted low-frequency enhancement of the spectral density of the log amplitude scintillations in the region of the 60 GHz oxygen absorption peak and the results indicate that large horizontal-scale sizes have a strong influence on t... View full abstract»

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  • Millimetre-wave propagation along railway lines

    Publication Year: 1983, Page(s):688 - 694
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1504 KB)

    The operation of modern railway systems requires a high degree of safety and reliability. This can be accomplished by using millimetre waves for communication and control. Besides high-data-rate relaying, this approach enables the transmission of highly concentrated radio beams; thus a `radio tube¿¿ can be shaped and limited to the railway track only. There are two frequency ranges of interest: th... View full abstract»

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  • Performance of an interferometer angle-measuring receiver against non line-of-sight transmitters

    Publication Year: 1983, Page(s):695 - 700
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (629 KB)

    Experiments have been conducted using a microwave interferometer to measure the direction of arrival of signals when the propagation path is obstructed by bare or wooded ridges. A number of paths with different ranges and scattering angles have been investigated. The receiver and transmitter sites were surveyed to provide accurate position information, relative to terrain features, and calibration... View full abstract»

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  • Mobile radio propagation in rural areas at 168, 455 and 896 MHz

    Publication Year: 1983, Page(s):701 - 706
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (762 KB)

    An extensive series of field trials has been carried out in an undulating rural area in the vicinity of Bath at frequencies between 168 and 896 MHz. A strong correlation is evident between the results at all frequencies with the propagation losses tending to increase with an increase in carrier frequency. Although range is an important factor in determining propagation loss, terrain variations als... View full abstract»

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Aims & Scope

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

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