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IEE Proceedings - Radar, Sonar and Navigation

Issue 4 • Date Aug 1999

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Displaying Results 1 - 6 of 6
  • Underwater digital communication utilising parametric sonar with M-ary DPSK modulation

    Publication Year: 1999, Page(s):213 - 218
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (420 KB)

    A real time M-ary differential phase-shift keying (MDPSK) communication system utilising parametric sonar has been developed. The system employs a 50 kHz primary frequency and a 5 kHz difference frequency. It has been tested in the Gulf of Lion and at Cap Ferrat in the Mediterranean Sea. Experimental results indicate that the system can be used in shallow water to realise real time acoustic commun... View full abstract»

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  • Algorithms for position fixing using pulse arrival times

    Publication Year: 1999, Page(s):208 - 212
    Cited by:  Papers (7)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (272 KB)

    A general equation covering the calculation of position in synchronous, hyperbolic and bistatic fixing systems is derived. It is shown that the least-squares estimate of position for this quadratic problem is the solution of a system of linear equations depending on a parameter which satisfies a polynomial. For small errors, setting the parameter to zero gives a good approximation to the optimum s... View full abstract»

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  • Radar clutter attractor: implications for physics, signal processing and control

    Publication Year: 1999, Page(s):177 - 188
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (880 KB)

    A discussion is presented on the chaotic dynamics of sea clutter in the light of current knowledge about chaos theory. The discussion builds on experimental results reported by Haykin and Puthusserypady (see Chaos, vol.7, p.777-802, 1997, IEE 1997 Radar Conf., Edinburgh, Scotland, p.14-16, 1997, and Chaotic dynamics of sea clutters, Wiley, 1999) on the chaotic dynamics of sea clutter under varying... View full abstract»

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  • Resolution of ultra-wideband radar signals

    Publication Year: 1999, Page(s):189 - 194
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (336 KB)

    The paper considers the range resolution of ultra-wideband signals. The situation of targets, adjacent in range, of significantly different amplitude, as in the case of propagation in lossy media, is examined. Several examples, each taken from three general classes of waveform, are examined. In all cases, the comparison was restricted to equal energy of the signals in the time domain, relatively s... View full abstract»

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  • Autofocus and feature extraction in curvilinear SAR via a relaxation-based algorithm

    Publication Year: 1999, Page(s):201 - 207
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (356 KB)

    The paper presents a relaxation-based autofocus (AUTORELAX) algorithm that can be used to compensate for the aperture errors in curvilinear synthetic aperture radar (CLSAR) and to extract three-dimensional target features. A self-contained detailed derivation of the data model for the autofocus problem in CLSAR is presented. Experimental and simulation results show that AUTORELAX can be used to si... View full abstract»

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  • False alarm control and self-masking avoidance by a biparametric clutter map in a mixed interference environment

    Publication Year: 1999, Page(s):195 - 200
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (312 KB)

    In the context of airport surface traffic surveillance through high resolution radars, an appropriate model for clutter or target backscattering is the log-normal. Because of the spatial non-homogeneity of clutter, the detection problem is better approached by the use of clutter maps. A biparametric clutter map is proposed and its performance is investigated, considering the effect of A/D conversi... View full abstract»

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Aims & Scope

IEE Proceedings Radar, Sonar and Navigation covers the theory and practice of systems involving the processing of signals for radar, radio location, radio navigation and surveillance purposes.

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