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IEEE Transactions on Aerospace and Electronic Systems

Issue 3 • July 1992

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Displaying Results 1 - 25 of 36
  • Correction to 'Lyapunov stability designs for switching regulator/low-pass filter system'

    Publication Year: 1992, Page(s):881 - 884
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (311 KB)

    It is noted that the results obtained in the above-titled paper (ibid., vol.25, no.5, p.602-610, Sept. 1989) are erroneous since the Lyapunov matrix equation was not solved correctly and completely. Also, erroneous conclusions resulted because a solution to the ten simultaneous equations which result from the evaluation of that equation was not obtained. These errors are corrected and the Lyapunov... View full abstract»

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  • Comment on "Eigenstructure assignment for linear systems" by A.N. Andry, et al. [Aerospace control]

    Publication Year: 1992, Page(s):920 - 921
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (175 KB)

    In the above-titled paper (see ibid., vol.AES-19, p.711-729, Sept. 1983), an achievability subspace is given and used for eigenstructure assignment of linear systems with gain output feedback. The commenter shows that the achievability subspace is not generally achievable.<> View full abstract»

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  • The effect of I,Q mismatch errors on adaptive cancellation

    Publication Year: 1992, Page(s):729 - 740
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    The effects of in-phase (I) and quadrature-phase (Q) amplitude errors and low-pass-filter (LPF) errors on adaptive cancellers are investigated. I,Q errors occur because of errors in the synthesis process of the mixers and LPFs designed to be identical for each input channel. These I,Q errors among the channels result in cancellation degradation. Tapped delay line transversal filters have been prop... View full abstract»

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  • Land mobile satellite propagation experiments in Kyoto City

    Publication Year: 1992, Page(s):718 - 727
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    In February of 1990, land mobile satellite propagation experiments were conducted in Kyoto City, Japan, using the Engineering Test Satellite V (ETS-V). The signal transmitted from the satellite was received and recorded at a mobile unit moving in different streets of the downtown area. The streets chosen have typical downtown medium and high rise buildings, electric utility poles, trees, etc., whi... View full abstract»

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  • Sensitivity analysis of DOA estimation algorithms to sensor errors

    Publication Year: 1992, Page(s):708 - 717
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    A unified statistical performance analysis using subspace perturbation expansions is applied to subspace-based algorithms for direction-of-arrival (DOA) estimation in the presence of sensor errors. In particular, the multiple signal classification (MUSIC), min-norm, state-space realization (TAM and DDA) and estimation of signal parameters via rotational invariance techniques (ESPRIT) algorithms ar... View full abstract»

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  • Monopulse-radar angle tracking in noise or noise jamming

    Publication Year: 1992, Page(s):622 - 638
    Cited by:  Papers (34)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1232 KB)

    In many monopulse radars, feedback in the angle-tracking servo system is taken to be directly proportional to the monopulse ratio. In those radars, monopulse measurements are conditioned on simultaneous occurrences of receiver sum-channel video exceeding a detection threshold: if a detection fails to occur, the measurement is ignored, and the angle-tracking servo is made to coast. Such conditionin... View full abstract»

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  • A multioutput LLC-type parallel resonant converter

    Publication Year: 1992, Page(s):697 - 707
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    When an LLC-type parallel resonant converter (LLC-PRC) operates above resonant frequency, the switching transistors can be turned off at zero voltage. Further study reveals that the LLC-PRC possesses the advantage of lower converter voltage gain as compared with the conventional PRC. Based on the analytic results derived, a complete set of design curves from which a systematic design procedure is ... View full abstract»

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  • Convergence analysis for inexact mechanization of Kalman filtering

    Publication Year: 1992, Page(s):612 - 621
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    A computational aspect of real-time estimation is considered, in which the estimation algorithm to be used has the standard optimal Kalman filtering structure, but the actual inverse matrix within the Kalman gain is replaced by an expedient approximation at each instant. In real-time applications, most Kalman filtering schemes are approximate to a degree as a consequence of numerical roundoff matr... View full abstract»

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  • Radar receiver optimization for a continuously scanning antenna

    Publication Year: 1992, Page(s):861 - 868
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    The optimum coherent radar receiver configuration is derived for a continuously scanning antenna on the basis of maximizing the available energy for a given processor complexity. Included in the analysis are the length of the coherent dwell, the size of the discrete Fourier transform and the degree of weighting used for Doppler filtering, and the use of overlapped processing windows. Gaussian shap... View full abstract»

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  • Experiments on aeronautical satellite communications using ETS-V satellite

    Publication Year: 1992, Page(s):788 - 796
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    The world's first aeronautical satellite communication experiments, conducted at L-band frequencies using a commercial aircraft, are described. An airborne antenna with electronically steerable beam and communication equipment was installed in a B-747F freighter flying over transoceanic flight routes. The satellite used in these experiments is the Engineering Test Satellite-Five (ETS-V). ... View full abstract»

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  • Multisignal time delay detection and tracking

    Publication Year: 1992, Page(s):675 - 696
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1456 KB)

    An optimum solution to the time delay detection and tracking problem for a single signal is extended to the multisignal problem where the number of signals present in the observed data (if any) is unknown. The number of signals present is determined, and the time delay of each detected signal is tracked. The number of possible global, or first level, hypotheses is large because of the exponential ... View full abstract»

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  • On the connection between maximum likelihood sensitivity analysis and nuisance parameter analysis

    Publication Year: 1992, Page(s):884 - 886
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    Sensitivity analysis provides a mean-square-error measure of how the maximum-likelihood (ML) estimates of parameters of interest would change with changes in parameters not being estimated (i.e., nuisance parameters). This type of sensitivity analysis alone does not provide confidence intervals that include the uncertainty in nuisance parameters, whereas nuisance parameter analysis does provide su... View full abstract»

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  • Performance analysis of bearing-only target location algorithms

    Publication Year: 1992, Page(s):817 - 828
    Cited by:  Papers (149)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    The performance of two well-known bearing-only location techniques, the maximum likelihood (ML) and the Stansfield estimators, is examined. Analytical expressions are obtained for the bias and the covariance matrix of the estimation error, which permit performance comparison for any case of interest. It is shown that the Stansfield algorithm provides biased estimates even for large numbers of meas... View full abstract»

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  • Target motion compensation by spectrum shifting in synthetic aperture radar

    Publication Year: 1992, Page(s):895 - 901
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    Target motion can severely distort the image in a conventional synthetic aperture radar (SAR) by causing targets having even small components of radial velocity to be lost or to appear with enormous along-track errors. The presence of moving targets in the image can be detected from the spectral characteristics of the data samples contained in the synthetic aperture sequences being processed. By i... View full abstract»

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  • An experimental investigation of three eigen DF techniques

    Publication Year: 1992, Page(s):852 - 860
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    The comparative direction-finding (DF) performance of multiple signal classification (MUSIC), ROOT-MUSIC, and estimation of signal parameters via rotational invariance techniques (ESPRIT) is considered. Data were collected from two target transmitters operating simultaneously. The objective of the experiment was to evaluate multipath resolution capability using measurement precision equivalent to ... View full abstract»

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  • Taxonomic performance evaluation for multitarget tracking systems

    Publication Year: 1992, Page(s):775 - 787
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    A scoring scheme based on an object track classification which facilitates performance evaluation for multiple-target tracking systems is derived and applied to specific test cases involving a comparison of operational and modified tracking system performance. The performance measures derived can be applied both to comparative evaluations of tracking system alternatives where relative performance ... View full abstract»

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  • Modification of the SAR step transform algorithm

    Publication Year: 1992, Page(s):666 - 674
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    When the basic step transform algorithm is used to compress synthetic-aperture radar (SAR) signals in azimuth, the linear FM rate and sampling rate must satisfy certain tight constraints. In practice, these constraints cannot be satisfied and errors are introduced into the compressed SAR image. A modification is described of the basic step transform which incorporates interpolation and resampling ... View full abstract»

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  • A persymmetric multiband GLR algorithm

    Publication Year: 1992, Page(s):806 - 816
    Cited by:  Papers (49)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    By exploring the covariance structure information to reduce the uncertainty in adaptive processing, a persymmetric generalized likelihood ratio algorithm (PGLR) is developed together with the closed-form expressions of probabilities of detection and false alarm. This multiband algorithm, which requires less computation, can significantly outperform the corresponding unstructured multiband GLR algo... View full abstract»

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  • The effect of gyro nonorthogonality error on gyrocompassing

    Publication Year: 1992, Page(s):890 - 893
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The effect of the gyro nonorthogonality on the two-step gyrocompassing process is analyzed. It is shown that the azimuth misalignment resulting from gyro nonorthogonality depends on the platform direction with respect to geographic frame. Gyrocompassing error is explicitly expressed in terms of gyro nonorthogonality and gyro parameters. A compensation scheme to eliminate the gyrocompassing error, ... View full abstract»

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  • Current distribution control for parallel connected converters. II

    Publication Year: 1992, Page(s):841 - 851
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    For pt.I, see ibid., vol.28, no.3, p.829-840 (1992). In the central-limit control (CLC), the multiloop controls are employed to regulate the output voltage and track the central weighted current, thus equalizing the output current of each converter module (CM). The current distribution error (CDE) between the output current of each CM is used as a criterion in judging system performance. The predi... View full abstract»

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  • Interrelationships among performance characteristics, capacitance, and sequence impedances of single-phase motors

    Publication Year: 1992, Page(s):908 - 909
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    The author presents a clear, concise method of analysis of the performance of the single-phase induction motor with a capacitor in one winding. Using familiar symmetrical component notation, the developed equations permit rapid calculation of average electromagnetic torque, power factor, line current, and efficiency in terms of capacitance and motor sequence impedances, at any speed. The effect of... View full abstract»

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  • Calculation of geometric dilution of precision

    Publication Year: 1992, Page(s):893 - 895
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    A very simple closed-form formula for the calculation of the geometric dilution of precision (GDOP) in Global Positioning System (GPS) navigation and in Global Navigation Satellite System (GLONASS) navigation is presented, which requires less than 40 multiplications View full abstract»

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  • Optimal data fusion of correlated local decisions in multiple sensor detection systems

    Publication Year: 1992, Page(s):916 - 920
    Cited by:  Papers (111)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    Z. Chair and P.R. Varshney (1986) solved the data fusion problem for fixed binary local detectors with statistically independent decisions. Their solution is generalized by using the Bahadur-Lazarsfeld expansion of probability density functions. The optimal data fusion rule is developed for correlation local binary decisions, in terms of the conditional correlation coefficients of all orders. It i... View full abstract»

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  • Robust dissipative compensators for flexible spacecraft control

    Publication Year: 1992, Page(s):768 - 774
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    The problem of controller design for flexible spacecraft is addressed. Model-based compensators, which rely on the knowledge of the system parameters to tune the state estimator, are first considered, and are shown to have high sensitivity to parameter uncertainties. Three types of dissipative controllers, which use collocated actuators and sensors, are next considered. These controllers guarantee... View full abstract»

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  • Analysis of CA-CFAR processors for linear-law detection

    Publication Year: 1992, Page(s):661 - 665
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A method for evaluating the performance of cell-averaging constant false alarm rate (CA-CFAR) processors which use the amplitude of echo signals rather than their squared amplitude is presented. Results for the case of Rayleigh clutter/noise statistics are given. Detection probabilities are evaluated for the case of a Rayleigh fluctuating target embedded in Rayleigh clutter/noise for linear-law CA... 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. 

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Meet Our Editors

Editor-in-Chief
Lance Kaplan
Army Research Laboratory