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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
  • 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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  • 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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  • Phased array radar and the detection of `low observables'

    Publication Year: 1990, Page(s):491 - 495
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    Solid-state active phased array radar is examined in the context of the widely reported developments in the reduction of the radar cross sections of military targets. It is shown that this form of radar makes the optimum use of power and aperture and is an increasingly attractive approach for the detection of small targets. The possibilities for the generation of high powers with solid-state phase... View full abstract»

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  • The research of multi-targets robust tracking filter

    Publication Year: 1990, Page(s):629 - 632
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    The structure and design method of a multitarget robust tracking filter based on the results of previous work is discussed. This filter mainly solves robust tracking for maneuverable targets. This filter consists of fuzzy set estimator and self-tuning estimator. These designs are respectively based on the concepts of fuzzy set theory and the second innovations sequence. Practical application shows... View full abstract»

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  • Propagation compensation by waveform predistortion

    Publication Year: 1990, Page(s):238 - 242
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    Certain modifications of the Cobra Dane radar are considered, particularly modernization of the waveform generator. For wideband waveforms, the dispersive effects of the ionosphere become increasingly significant. The technique of predistorting the transmitted waveform so that a linear chirp is received after two-way passage is one way to overcome that dispersion. This approach is maintained for t... View full abstract»

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  • A maneuvering target tracking system with correlated measurement noises

    Publication Year: 1990, Page(s):451 - 455
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The maneuvering target tracking problem with correlated measurement noises is considered. Using the multiple model estimator method to accommodate the maneuvering effect, an efficient algorithm is derived to decorrelate the measurement noise in the system. It is found that significant improvement of the system performance can be obtained from the decorrelation process. A tuning algorithm is propos... 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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  • Multiple target tracking using hidden Markov models

    Publication Year: 1990, Page(s):625 - 628
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The application of hidden Markov models (HMM) to the problem of tracking multiple targets is discussed. The tracker generates multiple discrete Viterbi tracks and automatically accounts for track iteration, termination, and ambiguous measurements. The tracker is not smoothing-based, as are most existing systems such as Kalman and PDA (probabilistic data association) trackers, but is discrete in th... View full abstract»

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  • Measurement of the performance of moving target indication radars

    Publication Year: 1990, Page(s):170 - 175
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (960 KB)

    A quadrahedral reflector that provides ideal moving target Doppler shifted radar returns so that field measurements can determine the actual clutter rejection of the radar has been developed. The development of the measurement technique, results of measurements performed on the US Customs aerostat radar located at Ft. Huachuca, Arizona, and results of measurement on the US Customs aerostat radar l... View full abstract»

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  • A new method of motion compensation for ISAR

    Publication Year: 1990, Page(s):234 - 237
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    A detailed consideration of the accuracy requirement for the compensation for the inverse synthetic aperture radar is presented. A new scheme of the motion compensation is submitted, in which the overall target, not any particular target scatter, is tracked to do the motion compensation. Some experimental results are given. The results indicate that this scheme of motion compensation is effective ... View full abstract»

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  • Conceptual design of a 1-MW CW X-band transmitter for planetary radar

    Publication Year: 1990, Page(s):147 - 152
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A proposed conceptual design for increasing the output power of an existing X-band planetary radar transmitter from 365 kW to 1 MW CW is discussed. The basic transmitter system requirements as dictated by the specifications for the radar are discussed. The characteristics and expected performance of the high-power klystron are considered, and the transmitter power amplifier system is disc... View full abstract»

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  • Optimal polarimetric detection of radar target in a slowly fluctuating environment of clutter

    Publication Year: 1990, Page(s):211 - 216
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    It is shown that it is possible to improve the radar detection performance by using appropriate signal processing on two orthogonal polarization states. A CFAR (constant false alarm rate) polarimetric detection system based on the study of the polarization difference between clutter and target is proposed. Considering that the polarization state of the clutter echoes fluctuates slowly from cell to... 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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  • Radar imaging based on iterative algorithms

    Publication Year: 1990, Page(s):573 - 578
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    A discrete model for radar imaging is developed, and, based on this model, the maximum entropy algorithm is adapted to radar imaging. Although such iterative algorithms are usually time-consuming, it is shown that, if the algorithms are appropriately simplified, it is possible to realize them even in real time. The efficiency of iterative algorithms is shown through computer simulations View full abstract»

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  • Impact of tracking requirements on space-based radar (SBR) design

    Publication Year: 1990, Page(s):621 - 624
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    The fundamental relationships necessary for the design of SBRs to perform both search and tracking functions are derived. The impact of tracking requirements including track update time, the number of beams required to establish a track and the number of targets kept in track is addressed. The effects of constellation size and background traffic identities are included. The derivation of these rel... View full abstract»

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  • Mismatched filter design for pulse compression

    Publication Year: 1990, Page(s):253 - 257
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    A mismatched filter design is introduced for periodic sequences where the receiver filter coefficients are optimized with the property that all sidelobes of the output signal are (identical) zero. Some results, especially for binary sequences are given, and it is shown that for each code length N>2 there exists at least one sequence (and a corresponding mismatched filter) that has a pe... View full abstract»

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  • 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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  • PHARUS: a polarimetric C-band SAR

    Publication Year: 1990, Page(s):228 - 233
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    A polarimetric SAR (synthetic aperture radar) system was designed in The Netherlands. The project is carried out in two steps. In this work, the first step, consisting of the preparatory studies including a SAR testbed, is described in detail. This SAR system will have limited capabilities, but will serve the purpose of acquiring experience with aircraft SAR and its technology. The system is built... View full abstract»

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  • ARSR-4: unique solutions to long-recognized radar problems

    Publication Year: 1990, Page(s):6 - 11
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    Forty L-band three dimensional radars will be deployed on the periphery of the United States for joint use by the United States Air Force and the Federal Aviation Administration. The unattended radar system is designed to scan a range of 250 nautical miles up to an altitude of 100000 feet with look-down capability from high sites. The radar must detect fast, small-radar cross-section airc... View full abstract»

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  • A hyper harmonic resolution by using the discrete prolate spheroidal wave functions

    Publication Year: 1990, Page(s):526 - 531
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Based on the harmonic analysis method, discrete spheroidal wave functions are used to achieve a very high spectral resolution. For an N samples vector of the measured signal, the classical Fourier transform discrimination capability is 1/N, while in the method proposed, for the same number of samples, the discrimination capability might attain the value of 2/P, with ... View full abstract»

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  • An automatic phase alignment system for transmitters

    Publication Year: 1990, Page(s):141 - 146
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    An automatic phase alignment concept that will adjust and maintain the correct phase balance within a radar transmitter configured with one or more pairs of parallel channels is proposed. Such a system would eliminate the maintenance of tight tolerances on the absolute lengths of individual components within the transmitter's parallel paths and will compensate for long-term variations in component... View full abstract»

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  • The use of a clutter map in the artillery locating radar ARTHUR

    Publication Year: 1990, Page(s):207 - 210
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    Since artillery shells and birds have similar radar cross sections, a clutter map is introduced to prevent the overloading of an artillery locating radar by bird echoes. A simple mathematical model for the function of the clutter map has been developed. The model is based on a stochastic description of the birds, including the distribution of cross sections, velocities, and bird densities. In para... 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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  • A phased array calibration technique using eigenstructure methods

    Publication Year: 1990, Page(s):304 - 308
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    An eigenstructure-based method for direction finding in the presence of angularly dependent sensor phase and gain perturbations is presented. One application for this technique is the calibration of a radar array degraded by mutual coupling effects. The method simultaneously computes an estimate of the angle of arrival of a single source and calibrates the array for that specific angle. A calibrat... View full abstract»

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