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IEEE International Conference on Radar

7-10 May 1990

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Displaying Results 1 - 25 of 114
  • Record of the IEEE 1990 International Radar Conference (Cat. No.90CH2882-9)

    Publication Year: 1990
    Request permission for commercial reuse | PDF file iconPDF (61 KB)
    Freely Available from IEEE
  • Interception of LPI radar signals

    Publication Year: 1990, Page(s):108 - 111
    Cited by:  Papers (14)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The interception problem is reviewed, an LPI radar design is examined and the performance of intercept receivers of the future is considered. The receiver needed to intercept LPI signals must respond across a broad band and provide noncoherent integration capabilities over times comparable to the coherent (or noncoherent) integration times used by radars. One useful receiver design is the rapidly ... View full abstract»

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  • Experimental study of polarization influence on angles intensity

    Publication Year: 1990, Page(s):362 - 364
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    Good weather angels are echoes detected by a radar when in the searched volume of air space no real objects exist. Experimental work is presented to show how the polarization state affects the intensity of good weather angels. Experimental data have been collected from the L-band long-range Polish primary surveillance radars (PSRs) (AVIA C) by registration of plots from the extractor and ... View full abstract»

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  • Radar detection sensitivity as a function of target dimensionality

    Publication Year: 1990, Page(s):106 - 107
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB)

    Preliminary experiments have been conducted comparing the detection sensitivities of zero-dimensional (0-D) and two-dimensional (2-D) displays, and of 2-D and three-dimensional (3-D) images. The 0-D scenes were created by adding a signal of known strength to a randomly selected pixel in a field of ground clutter. The clutter was from farmland, and was obtained in ground-to-ground imaging experimen... View full abstract»

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  • Adaptive suppression of changing clutter and interference with unknown spectral statistics in the sense of minimum residue noise power

    Publication Year: 1990, Page(s):356 - 361
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    An adaptive technique for generating filter weight for the rejection of clutter and interference with unknown spectral statistics is presented. The adaptive processor generates the average weight vector in the sense of the minimum residue noise power based on the injected noise-level vector in the weight control algorithm. This can be utilized to identify and reject an unknown sequence of the clut... View full abstract»

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  • Radar altimeter for surface analysis in planetary applications

    Publication Year: 1990, Page(s):28 - 33
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    A new-concept radar altimeter for the ESA-NASA joint mission named Rosetta has been studied. The goal of that mission is to approach and land on a comet nucleus, take a sample of the comet nucleus, and bring it to the Earth. The success of the mission is strongly related to a safe landing on a suitable site. A radar altimeter should perform the main operations during the landing phase giving infor... View full abstract»

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  • Angle measurement in the presence of mainbeam interference

    Publication Year: 1990, Page(s):444 - 450
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    The estimation of the angle of arrival of a desired signal in the presence of mainbeam interference is discussed. Adaptive antenna arrays are incorporated to form adapted sum and difference beams in which the interference signals are suppressed. Monopulse error curves are then obtained, providing the necessary distortion correction curves across the entire mainbeam tracking angle region. New Crame... View full abstract»

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  • Alternative solutions for Hilbert filtering in a pulse compression radar

    Publication Year: 1990, Page(s):86 - 89
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    Hilbert filtering and pulse compression may be combined into one module by modifying the pulse compression. Three methods for doing this have been devised, and their relative merits investigated. The first of these results in the most straightforward implementation, the second is more efficient in terms of required hardware, and the third is most suitable for adaptive applications (i.e. applicatio... View full abstract»

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  • Direction-of-arrival estimation for narrow band coherent and incoherent sources in the presence of unknown noise fields

    Publication Year: 1990, Page(s):102 - 105
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    A solution is presented to the general multiple source location problem in which the sources are incoherent, partially coherent, or coherent narrowband plane waves contaminated by unknown noise at the sensor terminal. The method provides the required source azimuth and elevation angle estimates, and the array's geometry is diversified. The method is based on computing the difference of the subarra... View full abstract»

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  • A distributed CFAR processor with data fusion for correlated targets in homogeneous clutter

    Publication Year: 1990, Page(s):501 - 506
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    A distributed constant false alarm rate (CFAR) detector with data fusion when a clutter power transition and partially correlated Rayleigh targets are present in the range resolution cells is discussed. It is shown that by appropriately selecting the fusion rule at the data fusion center, the detection performance may be less sensitive to the degree of correlation among the received pulses. Analyt... View full abstract»

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  • Phase-stability detection of stationary targets

    Publication Year: 1990, Page(s):558 - 562
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    The SAR (synthetic aperture radar) detection of stationary targets hidden in highly cluttered environments by using phase stability is studied. The theoretical performance of such a detection scheme is evaluated using simplified target and clutter models. Detection is based on a model where targets contain a concentration of phase-stable scatterers, and clutter is made up of phase-unstable scatter... View full abstract»

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  • Empirical models for detection prediction in K-distribution radar sea clutter

    Publication Year: 1990, Page(s):189 - 194
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    Simple empirical models are described which enable the radar designer to determine single-scan detection probabilities from the signal-to-clutter ratio and false alarm probability, for the compound K-distribution clutter model. The method to apply these results is discussed in detail, and the variability of the clutter rejection coefficient is briefly reviewed. Results covering the follow... View full abstract»

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  • On adaptive implementation of optimum MTI in severely nonhomogeneous environments

    Publication Year: 1990, Page(s):351 - 355
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The problem of achieving the optimum MTI (moving target indicator) detection performance in strong clutter of unknown spectrum when the set of data available for the estimation of clutter statistics is small due to a severely nonhomogeneous environment is studied. A new adaptive implementation, called the Doppler domain localized generalized likelihood ratio processor (DDL-GLR), is proposed, and i... View full abstract»

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  • Modeling and performance of HF/OTH radar target classification systems

    Publication Year: 1990, Page(s):579 - 584
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    The effects of a class of multipath propagation channels on the performance of a radar target classification system are considered. A Rician frequency-selective fading channel model is used to characterize the effects of the multipath propagation medium and evaluate the performances of radar target classification systems. The performances of classification algorithms that use relative amplitude, r... View full abstract»

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  • Broad-band DOA estimation and beamforming in multipath environment

    Publication Year: 1990, Page(s):532 - 537
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    It is shown that the effective dimension of the signal subspace collapses in the presence of multipath and may be recovered with subarray averaging. The F-norm (Frobenius norm) of the cross-correlation matrix is proposed as a measure of the correlation between the impinging signals, and an upper bound on this norm, which depicts all the essential features of the true F-norm, is derived. Using this... View full abstract»

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  • Selection of parameters in the design of a naval fire control radar

    Publication Year: 1990, Page(s):22 - 27
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    The rationale and trade-off considerations involved in the definition of a new generation of high-performance tracking radar are described. The radar is the primary sensor for control of surface-to-air missiles, anti-aircraft or dual-purpose guns, and close-in weapons and is designed for all sizes of ships from 150 tons up. Operational requirements are outlined broadly and optimization investigati... View full abstract»

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  • Effect of glint errors on steady-state tracking accuracies of maneuvering targets

    Publication Year: 1990, Page(s):439 - 443
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    The effect of glint errors on target tracking accuracies is studied by various analytical means. The glint error is modeled as a first-order Markov process, characterized by a correlation time (τ) and a position error variance. The target motion is described by one of two dynamic models: the exponentially correlated velocity model and the exponentially correlated acceleration model. For both m... View full abstract»

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  • A synthetic aperture radar calibration transponder at C-band

    Publication Year: 1990, Page(s):81 - 85
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    Part of Australia's contribution to the European Space Agency's ERS-1 synthetic aperture radar experiment is the development of an active transponder to assist in the calibration of radar images. The architecture and experimental evaluation of a C-band zero-delay transponder are described in detail. The self-calibration loop of the system has been shown to provide and maintain 60 dB of ac... View full abstract»

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  • Long term integration using a phased array radar

    Publication Year: 1990, Page(s):313 - 315
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    A simple processing algorithm for performing long-term integration is developed and evaluated. The key step in the procedure is to make multiple ambiguous velocity estimates and use these velocity estimates to compensate for all possible target motions. Using simulation techniques, the probabilities of false alarm and detection are evaluated View full abstract»

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  • Radar vision

    Publication Year: 1990, Page(s):585 - 588
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The novel idea called radar vision is introduced. The goal of radar vision is to make radar into an intelligent remote-sensing device that is capable of cognition of the surrounding environment. The attributes of radar as an electromagnetic sensor are reviewed, and the possibility of radar learning from the environment is discussed. The issues of time and knowledge processing and the incorporation... View full abstract»

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  • Rendezvous radar for the orbital maneuvering vehicle

    Publication Year: 1990, Page(s):38 - 43
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    The rendezvous radar set (RRS) under development will be a key subsystem aboard NASA's new orbital maneuvering vehicle (OMV). The RRS is an X-band all solid-state, monopulse tracking, frequency-hopping, pulse-Doppler radar system. Targets of 1 m2 are detected at ranges greater than 4.5 nautical miles, and larger targets are detected at up to 10 nautical miles. The target is the... View full abstract»

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  • Separated covariance filtering

    Publication Year: 1990, Page(s):456 - 460
    Cited by:  Papers (4)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A separated covariance filter (SCF) for estimating position and velocity given noisy measurements is discussed. The SCF calculates the state errors due to measurement errors and those due to target acceleration separately. The SCF overcomes two difficulties with the standard Kalman filter technique: (1) selection of the process noise covariance; and (2) interpreting the Kalman state covariance. Th... View full abstract»

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  • Software development for airborne radar

    Publication Year: 1990, Page(s):96 - 101
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    Some aspects for development of software in a modern multimode airborne nose radar are described. First, an overview of where software is used in the radar units is presented. The development phases-system design, functional design, detailed design, function verification, and system verification-are then used as the starting point for the discussion. Methods, tools, and the most important document... View full abstract»

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  • Modeling the spectral structure of ducted sea clutter

    Publication Year: 1990, Page(s):201 - 206
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    A model has been developed to explain unusual sea clutter Doppler frequency spectral characteristics that were observed from search radars operating in ducting conditions. Sea returns from arctic coastal sites exhibit extreme mean Doppler frequency shifts, with the magnitudes of the means varying from one ocean area to another. The spectrum bandwidth for the individual returns was very narrow, eve... View full abstract»

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  • Experimental investigation of broad-band microstrip antennas

    Publication Year: 1990, Page(s):496 - 500
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    An experimental investigation of broadband microstrip antennas on a PTFE substrate with permittivity εr=2.1 and thickness h=1.6 mm is presented. A 17% bandwidth improvement is achieved by modifying the feed on the substrate with coaxial-fed disk antennas. Experiments carried out on circularly shaped modified patches showed a further bandwidth improvement of 80% over conven... View full abstract»

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