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
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    Freely Available from IEEE
  • Cascaded MTI and coherent integration techniques with motion compensation

    Publication Year: 1990, Page(s):164 - 169
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    Displaced phase center antenna (DPCA) is a technique for improving clutter rejection in airborne radars which use Doppler processing. Andrews (1972) evaluated DPCA in systems that incorporate delay line cancelers. This study extends the earlier work to include coherent integration. An analytical structure is established for accommodating an arbitrary number (n) of cancelers and an arbitra... 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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  • Polarisation parameters from wide-band high resolution radar imagery

    Publication Year: 1990, Page(s):543 - 548
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    It is demonstrate that polarimetric high-resolution experiments are able to produce images of distinct scattering centers whose properties can be examined by means of the theory of optimal polarizations. The results are in excellent quantitative agreement with simulations based on the geometrical theory of diffraction (GTD). Polarimetric high-resolution experiments thus enable the investigation of... View full abstract»

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  • Review of the homodyne technique for coherent radar

    Publication Year: 1990, Page(s):159 - 163
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    The merits of using homodyne techniques for coherent radar are examined. The influence of various component deficiencies is discussed with relation to the choice between homodyne and heterodyne. The use of digital IQ signal generation and processing to correct for some of the problems of modulator and demodulator design by predistortion, offset correction, etc. is briefly addressed. A 5.3 GHz synt... 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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  • 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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  • 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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  • Radar imaging of noncooperating maneuvering aircraft

    Publication Year: 1990, Page(s):563 - 568
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The problem of performing automatic high resolution radar imaging of noncooperating maneuvering aircraft is investigated. In order to define the main features of the radar processor, a numerical model of the system which makes use of an electromagnetic model of the moving aircraft so that the actual, complete operating conditions can be simulated has been developed. The availability of such a nume... View full abstract»

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  • An experimental adaptive digital pulse compression subsystem for multi-function radar applications

    Publication Year: 1990, Page(s):153 - 158
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    An experimental adaptive digital pulse compression (ADPC) subsystem is described. This unit implements a complex correlation between a stored replica of the transmitted waveform and the signals received by the radar. Key to the adaptability of this unit is the use of high-speed VLSI digital ICs which permit bandwidths of up to 10 MHz, along with its ability to use a different waveform or pulse cod... 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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  • A new C-band SAR for ERS-1 underflights

    Publication Year: 1990, Page(s):223 - 227
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (692 KB)

    A high-resolution airborne C-band synthetic aperture radar (SAR) has been designed, built, and tested. The radar design based on digital technology to the largest possible extent, to make the system as adaptable as possible. This has resulted in a very flexible radar with variable resolution, swath width, and imaging geometry. Special attention was paid to system calibration when the syst... View full abstract»

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  • Ship detection in heavy sea clutter echoes and man-made radio noise environment for an on-shore HF ground wave frequency agile radar

    Publication Year: 1990, Page(s):34 - 37
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The spectral characteristics of sea clutter echoes and man-made noise disturbance in the HF band are analyzed. A new spectral method for ship detection in heavy sea clutter and man-made noise environment by an onshore ground wave radar is introduced. A T-R cell averaging detector with the assistance of a spectrum monitoring system operates on a frequency agile mode, and it can detect ships even if... View full abstract»

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  • EAGLE-a high accuracy 35 GHz tracking radar

    Publication Year: 1990, Page(s):461 - 466
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    The EAGLE tracking radar family is discussed. EAGLE is a fully coherent tracking radar operating in the 35-GHz band. The radar is unique in the way it combines pulse-to-pulse frequency agility and MTI filtering in a single transmission scheme. A brief comparison of different radar bands is given, and the EAGLE radar, along with its characteristics and techniques is discussed. Test results obtained... View full abstract»

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  • Measured scattering-matrix-data and a polarimetric CFAR-detector which works on this data

    Publication Year: 1990, Page(s):514 - 519
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Problems with a polarimetric radar which is able to measure the complete scattering matrix (SM) of a reflecting object are discussed. Emphasis is placed on polarimetric signal processing, in which the multichannel polarimetric target information is used to obtain improved results compared with signal processing of a nonpolarimetric radar. Measured SM data of different targets (rain and ground clut... View full abstract»

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  • Range ambiguous signature against sea clutter in an X-band multifunction radar

    Publication Year: 1990, Page(s):316 - 321
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    A multifunction X-band naval radar with an antenna that is mechanically scanned in azimuth and electronically scanned in both elevation and azimuth is discussed. Simulations that are mainly based on the cumulative detection probability are used to compare the performances of more or less range-ambiguous waveforms. It is demonstrated that range-ambiguous waveforms using medium pulse repeti... View full abstract»

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  • The Doppler spectrum for accelerating objects

    Publication Year: 1990, Page(s):385 - 390
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    The formalism for computing the Doppler spectrum for perfectly reflecting mirrors undergoing various types of accelerations is reviewed. This method is an amplification of work done by D. Censor and J. Cooper for one-dimensional waves. For sinusoidal waves, the formalism provides a computationally easy algorithm that enables determination of the Doppler spectrum. This method is exact and does not ... View full abstract»

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  • The exploratory development of a high power S-band solid state radar transmitter

    Publication Year: 1990, Page(s):135 - 140
    Cited by:  Papers (1)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    A solid-state power amplifier has been developed using 100 W S -band silicon bipolar transistors. The amplifier produces a nominal 400 W peak output power from 2.7 GHz to 3.0 GHz, at pulse widths up to 50 μs, at a 10% maximum duty cycle and 30% efficiency. A high-power planar hybrid combiner was also designed to combine 16 amplifiers to provide a nominal 5 kW RF output power. The isola... View full abstract»

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  • A conceptual SAR/altimeter radar with subsurface capabilities, for space missions

    Publication Year: 1990, Page(s):76 - 80
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    A conceptual radar system for planetary explorations is presented. This system's main features are the recognition of soil composition and surface geometrical characteristics, such as roughness and spatial correlation length, and subsurface sounding. These capabilites are provided to meet the two main requirements in space missions: the safety of the landing phase and the selection of an interesti... 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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  • Phase noise effects on turbulent weather radar spectrum parameter estimation

    Publication Year: 1990, Page(s):345 - 350
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    Accurate weather spectrum moment estimation is important in the use of weather radar for hazardous windshear detection. The effect of the stable local oscillator (STALO) instability (jitter) on the spectrum moment estimation algorithm is investigated. Uncertainty in the stable local oscillator will affect both the transmitted signal and the received signal since the STALO provides transmitted and ... View full abstract»

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  • Minimum power requirements of tracking

    Publication Year: 1990, Page(s):417 - 421
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    A methodology for relating the resources consumed by tracking a maneuvering target to the track accuracy achieved is described. This methodology accounts for beam shape loss, missed detections, and, in the case of a fire-control radar, reacquisition of the target when it has moved outside the beam. Normalized computational results for the minimum radar power required as a function of the track acc... View full abstract»

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  • 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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  • Comparison of a non-adaptive low-sidelobe array antenna with an adaptive phased array antenna

    Publication Year: 1990, Page(s):486 - 490
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    The question of what concept should be chosen for the case of an active, two-dimensional electronically scanning ground-based radar with many elements for jammer suppression in a dense jamming environment is discussed. The nonadaptive low sidelobe antenna is compared with the adaptive antenna. Although both antennas have the same performance for sidelobe jammers, the low-sidelobe (LS) antenna is v... 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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