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IEE Proceedings - Radar, Sonar and Navigation

Issue 2 • April 1999

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Displaying Results 1 - 7 of 7
  • Robustness of the likelihood ratio detector for moderately fluctuating radar targets

    Publication Year: 1999, Page(s):107 - 112
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (466 KB)

    The performance of the likelihood ratio detector (LRD) for moderately fluctuating targets (i.e. intermediate between Swerling II and Swerling I models) is evaluated for the case of poor knowledge of the target characteristics. In particular, the influence of incorrect assumptions in the design phase about the signal-to-interference ratio (SIR), the target correlation coefficient, the shape of the ... View full abstract»

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  • Analysis and simulation of land and rain clutter for PRC CW radar at X-band

    Publication Year: 1999, Page(s):101 - 106
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (424 KB)

    It is pointed out that rain, which can be treated as an object in the atmosphere, will cause a time spread of radar echo signals, as does the land when the radar grazing angle is low. For the pseudo-random code continuous wave (PRC CW) radar, the time-spread echo signals at a specified moment will be the superposition of some spread echo signals in a period of time before this specified moment. A ... View full abstract»

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  • Robust space-time adaptive processing (STAP) in non-Gaussian clutter environments

    Publication Year: 1999, Page(s):84 - 93
    Cited by:  Papers (21)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1384 KB)

    The problem of space-time adaptive processing (STAP) in non-Gaussian clutter is addressed. First, it is shown that actual ground clutter returns are heavy-tailed and their statistics can be accurately characterised by means of alpha-stable distributions. Then, a new class of adaptive beamforming techniques is developed, based on fractional lower-order moment theory. The proposed STAP methods adjus... View full abstract»

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  • High-range resolution for radar by oversampling and LMS pulse compression

    Publication Year: 1999, Page(s):95 - 100
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (428 KB)

    High range resolution for radar systems can be achieved in combination with pulse compression of polyphase coded signals without an increase in the signal bandwidth of the antenna and receiver system. The received signal is oversampled with an increased clock rate to also use some of the information in the spectral side lobes. The compression filter function is computed by the least mean square er... View full abstract»

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  • Fuzzy neural network approach for 2-D direction finding in multipath environments

    Publication Year: 1999, Page(s):78 - 83
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    A fuzzy neural network (FNN) approach for estimating the two-dimensional (2-D) direction of a radiating source in coherent multipath environments via a 2-D passive sensor array is presented. Outputs of the array are preprocessed by a judiciously constructed reference-point preprocessing scheme to produce proper inputs for an FNN. The FNN then uses these preprocessed outputs to produce the estimate... View full abstract»

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  • Adaptive beamforming system for radio-frequency interference rejection

    Publication Year: 1999, Page(s):73 - 77
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (380 KB)

    Results from an experimental antenna array that is processed adaptively to cancel external radio-frequency interference are presented. The eight-element array has been tested in a far-field anechoic chamber. The adaptive beamformer rejects sidelobe and main-lobe interference by up to 37 dB. A conventional Fourier beamformer rejects interference only in the sidelobes by between 13 and 30 dB dependi... View full abstract»

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  • Azimuth ambiguities in broadside and squint mode synthetic aperture sonar

    Publication Year: 1999, Page(s):113 - 119
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (620 KB)

    Synthetic aperture sonar (SAS) mapping rates are limited by the acoustic propagation speed in relation to the feasible platform velocity and the desired swath coverage. Such limitations result in azimuth undersampling and the appearance of ambiguities in SAS imagery. The position, spreading and ambiguity to signal ratio (ASR) of image aliases caused by grating lobes are discussed from a geometric ... 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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