By Topic

IEEE Transactions on Aerospace and Electronic Systems

Issue 3 • July 1992

Filter Results

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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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 (3)
    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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Target detection-sensitivity enhancement using high-resolution radar and 2-D and 3-D stereo target displays

    Publication Year: 1992, Page(s):886 - 890
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    A 1989 experiment in detection-sensitivity enhancement of an airplane target in a background of ground clutter is reported. The experiment showed an 11 dB improvement when a high-resolution radar target was displayed as a 2-D image rather than a blip or blob (0-dimensions). A further 7 dB was observed when the target was displayed in stereo (3-D). These extraordinary observations warrant independe... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Taxonomic performance evaluation for multitarget tracking systems

    Publication Year: 1992, Page(s):775 - 787
    Cited by:  Papers (8)
    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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A persymmetric multiband GLR algorithm

    Publication Year: 1992, Page(s):806 - 816
    Cited by:  Papers (42)  |  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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Current distribution control for parallel connected converters. I

    Publication Year: 1992, Page(s):829 - 840
    Cited by:  Papers (137)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    For pt.II, see ibid., vol.28, no.3, p.841-851 (1992). A master-slave control scheme for a uniform current distribution among converter modules in a parallel connected system is presented. In this technique, inner current loops are introduced to the system to achieve output current equalization. The current distribution error is used as a criterion for judging system performance. Using this control... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Robust dissipative compensators for flexible spacecraft control

    Publication Year: 1992, Page(s):768 - 774
    Cited by:  Papers (12)
    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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Calculation of geometric dilution of precision

    Publication Year: 1992, Page(s):893 - 895
    Cited by:  Papers (40)
    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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optimal data fusion of correlated local decisions in multiple sensor detection systems

    Publication Year: 1992, Page(s):916 - 920
    Cited by:  Papers (104)  |  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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance of diversely polarized antenna arrays for correlated signals

    Publication Year: 1992, Page(s):869 - 879
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    The performance of direction finding systems in a correlated signal environment utilizing diversely polarized antenna arrays is investigated. The Cramer-Rao bound (CRB) is used to evaluate the accuracy of the estimated directions of arrival (DOAs). Compact closed form formulas are presented for the CRB corresponding to the joint estimation of the DOAs, signal covariance matrix, signal polarization... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Monopulse-radar angle tracking in noise or noise jamming

    Publication Year: 1992, Page(s):622 - 638
    Cited by:  Papers (32)  |  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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multisignal time delay detection and tracking

    Publication Year: 1992, Page(s):675 - 696
    Cited by:  Papers (8)
    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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An improved multiple target angle tracking algorithm

    Publication Year: 1992, Page(s):797 - 805
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    An improved version of a multiple-target-angle tracking algorithm using sensor array outputs is presented. While retaining all the good features of the original algorithm, the improved version greatly reduces the error propagation due to the use of recursive approximations in updating target angle estimates. The assumption of a constant signal covariance matrix is no longer necessary. The improved... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Bandwidth performance of linear adaptive arrays with tapped delay-line processing

    Publication Year: 1992, Page(s):901 - 908
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    The nulling bandwidth of adaptive arrays with tapped delay-line processing is examined. Linear arrays with up to 10 elements are considered. It is shown how the number of taps in the delay lines and the amount of delay between taps affect the nulling bandwidth. For each size of array, the optimal number of delay-line taps and the optimal intertap delays are determined as functions of the required ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance analysis of bearing-only target location algorithms

    Publication Year: 1992, Page(s):817 - 828
    Cited by:  Papers (141)
    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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Current distribution control for parallel connected converters. II

    Publication Year: 1992, Page(s):841 - 851
    Cited by:  Papers (39)
    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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Characterizing radar emissions using a robust countermeasure receiver

    Publication Year: 1992, Page(s):741 - 755
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    The author presents a high-sensitivity signal processing approach for detecting and estimating the angle of arrival (AOA), frequency and pulse repetition frequency (PRF) of multiple radar emitters using broadband interferometers. Two time series are generated using information embedded in the sampled cross correlation of the signals obtained from three antenna elements (i.e. two base legs). The ph... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Land mobile satellite propagation experiments in Kyoto City

    Publication Year: 1992, Page(s):718 - 727
    Cited by:  Papers (9)
    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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Distributed detection by a large team of sensors in tandem

    Publication Year: 1992, Page(s):639 - 653
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1024 KB)

    The problem of decentralized binary hypothesis testing by a team consisting of N decision makers (DMs) in tandem is considered. Each DM receives an observation and transmits a binary message to its successor; the last DM has to decide which hypothesis is true. The necessary and sufficient condition for the probability of error to go asymptotically to zero as N→∞ is tha... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

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