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IEEE Transactions on Aerospace and Electronic Systems

Issue 3 • Date May 1991

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Displaying Results 1 - 18 of 18
  • Comments, with reply, on "Parallel resonant converter with LLC-type commutation

    Publication Year: 1991, Page(s):564 - 566
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (183 KB)

    In a recent paper by C.Q. Lee et al. (ibid., vol.25, no.6, p. 844-7, Nov. 1989), the authors analyzed a DC-DC converter that they termed the LLC-type PRC (parallel resonant converter). Its resonant network contains three active components-two inductances and a parallel capacitance-and as a consequence the converter might be expected to have third-order dynamics. But Lee et al. employed a matrix tr... View full abstract»

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  • Beamspace ML bearing estimation incorporating low-angle geometry

    Publication Year: 1991, Page(s):441 - 458
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1500 KB)

    A problem in low-angle radar tracking, namely, bearing estimation in the presence of a strong specular multipath component that arrives within the beamwidth of the direct path signal, is studied. Three-dimensional beamspace domain maximum likelihood (3D-BDML) is a computationally simple ML bearing estimation algorithm applicable in this scenario which operates in a 3-D beamspace. A variation of 3D... View full abstract»

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  • Acousto-optic spectrum analyzer techniques for monitoring CW

    Publication Year: 1991, Page(s):430 - 440
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    The issues associated with processing the outputs of an integrating acoustooptical spectrum analyzer (AOSA) to detect and identify the frequency and power of continuous wave (CW) signals are considered. The performance of the optimum detection strategy is presented, along with the Cramer-Rao bound on the performance of estimators of the frequency, and the performance of a simple peak-based frequen... View full abstract»

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  • Performance comparisons of modified SMI and GLR algorithms

    Publication Year: 1991, Page(s):487 - 491
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    Adaptive filtering for signal detection in colored interference of unknown statistics is addressed. The detection performance of a modified version of the well-known sample matrix inversion (SMI) algorithm, called the modified SMI (MSMI), is compared with that of the generalized likelihood ratio (GLR) algorithm in colored Gaussian interference. The performance sensitivity of the MSMI and GLR in co... View full abstract»

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  • Adaptive cell-averaging CFAR detection in distributed sensor networks

    Publication Year: 1991, Page(s):424 - 429
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    The problem of adaptive cell-averaging constant false-alarm rate (CFAR) detection is considered for two distributed sensor network topologies, namely the parallel and the tandem topologies. The compressed data transmitted amongst the detectors is assumed to be in the form of decisions. The overall systems are optimized to yield the maximum probability of detection for a fixed probability of false ... View full abstract»

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  • A localized adaptive MTD processor

    Publication Year: 1991, Page(s):532 - 539
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (700 KB)

    The problem of achieving the optimum moving target indicator (MTI) detection performance in strong clutter of unknown spectrum when the set of data available to 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 it... View full abstract»

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  • A minimax approach to the design of Doppler filters

    Publication Year: 1991, Page(s):481 - 486
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    The detection of a target in correlated clutter, thermal noise, and extraneous interference is considered. The amplitude, phase and Doppler frequency of the signal are not known a priori. A general criterion is presented which measures the performance of a suboptimal test relative to an optimal test. The criterion is encompassed into a design procedure used to design Doppler filters. The procedure... View full abstract»

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  • Monopulse tracking of Rayleigh targets: a simple approach

    Publication Year: 1991, Page(s):520 - 531
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    A simple derivation of the probability distribution of the monopulse ratio is presented. The derivation is based upon a conditional distribution and considers both Rayleigh targets and simple non-Rayleigh cases. The mean is obtained almost without calculation. The variance expression is given completely general noise and glint interpretation. Analytical expressions for angle error mean and spread,... View full abstract»

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  • High resolution exponential modeling of fully polarized radar returns

    Publication Year: 1991, Page(s):459 - 469
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    A method for modeling full polarization radar target is considered. The approach taken is to estimate a set of target features which describes the target as a set of attributed scattering centers. Each scattering center is characterized by its range, amplitude, and a polarization ellipse. An exponential model for the fully polarized radar return is described, and an algorithm for estimating the pa... View full abstract»

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  • Effect of errors on a contention-based TDMA protocol

    Publication Year: 1991, Page(s):492 - 506
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (892 KB)

    A hybrid contention-based time-division multiple access (TDMA) protocol was previously proposed for data transmission (D. Tsai et al., IEEE Trans. on Communications, COM-36, Feb. 1988, p.225-8). It provides satisfactory performance for an error-free channel. The effect of channel errors on the performance of this protocol is studied. To remain operational the protocol must be modified, and the mod... View full abstract»

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  • Terrain modeling for microwave landing system

    Publication Year: 1991, Page(s):540 - 549
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    A powerful analytical approach for evaluating the terrain effects on a microwave landing system (MLS) is presented. The approach combines a multiplate model with a powerful and exhaustive ray tracing technique and an accurate formulation for estimating the electromagnetic fields due to the antenna array in the presence of terrain. Both uniform theory of diffraction (UTD) and impedance UTD techniqu... View full abstract»

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  • Simple Kalman gains for filtering position and velocity measurements

    Publication Year: 1991, Page(s):566 - 571
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    An alternate set of equations is given for the exact computation of the Kalman gains under the conditions of no maneuvering input noise and measurements in position and velocity. They are simpler than the standard recursive equations, and are useful in applications where implementation of the standard Kalman filter is not possible due to real-time restrictions. When there is maneuvering input nois... View full abstract»

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  • Reconfigurable flight control via multiple model adaptive control methods

    Publication Year: 1991, Page(s):470 - 480
    Cited by:  Papers (139)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (856 KB)

    An aircraft flight control system with reconfigurable capabilities is considered. A multiple model adaptive controller (MMAC) is shown to provide effective reconfigurability when subjected to single and double failures of sensors and/or actuators. A command generator tracker/proportional-plus-integral/Kalman filter (CGT/PI/KF) form of controller was chosen for each of the elemental controllers wit... View full abstract»

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  • Compact equipment for on-board communications subsystem supervisory and control system

    Publication Year: 1991, Page(s):507 - 513
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    Onboard equipment for the communications subsystem supervisory and control (CSC) system of a next-generation multibeam high-capacity communications satellite is discussed. In order to keep the equipment as compact, lightweight, and low in power consumption as possible, an onboard data bus system using four kinds of LSIs was developed. It will be carried on-board the Japanese Engineering Test Satel... View full abstract»

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  • Radar target tracking-Viterbi versus IMM

    Publication Year: 1991, Page(s):550 - 563
    Cited by:  Papers (46)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    The performance of the Viterbi and the interacting multiple model (IMM) algorithms, applied to radar tracking and detection, are investigated and compared. Two different cases are considered. In the first case, target acceleration is identical to one of the system models while in the second case it is not. The performance of the algorithms depends monotonically on the maximal magnitude of the diff... View full abstract»

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  • Sequential ridge regression

    Publication Year: 1991, Page(s):571 - 574
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    A sequential algorithm which closely approximates ridge regression is introduced, and it is pointed out that the desired sequential ridge estimator can be obtained by properly choosing the free parameters of a startup technique for ordinary sequential least squares estimation. The derivation of this result is trivial; however, since no matrix inversions are needed for its implementation, this algo... View full abstract»

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  • Maneuvering target tracking using IMM method at high measurement frequency

    Publication Year: 1991, Page(s):514 - 519
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The problem of tracking a maneuvering target with a high measurement frequency is considered. The measurement noise is significantly correlated when the measurement frequency is high. A simple decorrelation process is proposed to enhance the interacting multiple model (IMM) algorithm to track a maneuvering target with correlated measurement noise. It is found that the decorrelation process may imp... View full abstract»

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  • Estimating the number of signals using reference noise samples

    Publication Year: 1991, Page(s):575 - 579
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    Criteria for estimating the number of signals in the case of small-sample populations are considered. The criteria introduced by M. Wax and T. Kailath (1985) do not work well in this case. Two new criteria based on information theoretic and eigenmode composition-based criteria are proposed, assuming a known noise covariance. Simulation results show a significant improvement in the performance of e... View full abstract»

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Aims & Scope

IEEE Transactions on Aerospace and Electronic Systems focuses on the organization, design, development, integration, and operation of complex systems for space, air, ocean, or ground environment.  These systems include, but are not limited to, navigation, avionics, spacecraft, aerospace power, radar, sonar, telemetry, defense, transportation, automated testing, and command and control. 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Lance Kaplan
Army Research Laboratory