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Aerospace and Electronic Systems, IEEE Transactions on

Issue 3 • Date 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)
    Save to Project icon | Request Permissions | 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 (3)
    Save to Project icon | Request Permissions | 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 (5)
    Save to Project icon | Request Permissions | 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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  • Characterizing radar emissions using a robust countermeasure receiver

    Publication Year: 1992 , Page(s): 741 - 755
    Save to Project icon | Request Permissions | 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»

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  • Current distribution control for parallel connected converters. I

    Publication Year: 1992 , Page(s): 829 - 840
    Cited by:  Papers (95)
    Save to Project icon | Request Permissions | 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»

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  • Reduced-order multiple model adaptive controller for flexible spacestructure

    Publication Year: 1992 , Page(s): 756 - 767
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (872 KB)  

    The robustness of a moving-bank multiple model adaptive estimator/controller to order reduction in the controller design model is examined. It is shown that the adaptive mechanism and bank-moving logic are not confounded by the effects of unmodeled higher order modes of a large flexible spacestructure. Control characteristics are achieved that are essentially equivalent to those of an artificially... View full abstract»

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  • Radiometric detection of spread-spectrum signals in noise of uncertain power

    Publication Year: 1992 , Page(s): 654 - 660
    Cited by:  Papers (132)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (520 KB)  

    The standard analysis of the radiometric detectability of a spread-spectrum signal assumes a background of stationary, white Gaussian noise whose power spectral density can be measured very accurately. This assumption yields a fairly high probability of interception, even for signals of short duration. By explicitly considering the effect of uncertain knowledge of the noise power density, it is de... View full abstract»

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  • Convergence analysis for inexact mechanization of Kalman filtering

    Publication Year: 1992 , Page(s): 612 - 621
    Save to Project icon | Request Permissions | 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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  • Interrelationships among performance characteristics, capacitance, and sequence impedances of single-phase motors

    Publication Year: 1992 , Page(s): 908 - 909
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | 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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  • A multioutput LLC-type parallel resonant converter

    Publication Year: 1992 , Page(s): 697 - 707
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | 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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  • Radar receiver optimization for a continuously scanning antenna

    Publication Year: 1992 , Page(s): 861 - 868
    Save to Project icon | Request Permissions | 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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  • 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)
    Save to Project icon | Request Permissions | 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»

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  • Current distribution control for parallel connected converters. II

    Publication Year: 1992 , Page(s): 841 - 851
    Cited by:  Papers (21)
    Save to Project icon | Request Permissions | 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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  • Monopulse-radar angle tracking in noise or noise jamming

    Publication Year: 1992 , Page(s): 622 - 638
    Cited by:  Papers (20)  |  Patents (1)
    Save to Project icon | Request Permissions | 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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  • The effect of gyro nonorthogonality error on gyrocompassing

    Publication Year: 1992 , Page(s): 890 - 893
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | 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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  • Modification of the SAR step transform algorithm

    Publication Year: 1992 , Page(s): 666 - 674
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | 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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  • Bandwidth performance of linear adaptive arrays with tapped delay-line processing

    Publication Year: 1992 , Page(s): 901 - 908
    Cited by:  Papers (26)
    Save to Project icon | Request Permissions | 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»

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  • Performance of diversely polarized antenna arrays for correlated signals

    Publication Year: 1992 , Page(s): 869 - 879
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | 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»

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

    Publication Year: 1992 , Page(s): 884 - 886
    Save to Project icon | Request Permissions | 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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  • A persymmetric multiband GLR algorithm

    Publication Year: 1992 , Page(s): 806 - 816
    Cited by:  Papers (19)  |  Patents (1)
    Save to Project icon | Request Permissions | 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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  • An experimental investigation of three eigen DF techniques

    Publication Year: 1992 , Page(s): 852 - 860
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | 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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  • Distributed detection by a large team of sensors in tandem

    Publication Year: 1992 , Page(s): 639 - 653
    Cited by:  Papers (36)
    Save to Project icon | Request Permissions | 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»

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  • Multisignal time delay detection and tracking

    Publication Year: 1992 , Page(s): 675 - 696
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | 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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  • Optimal data fusion of correlated local decisions in multiple sensor detection systems

    Publication Year: 1992 , Page(s): 916 - 920
    Cited by:  Papers (66)  |  Patents (1)
    Save to Project icon | Request Permissions | 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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  • An improved multiple target angle tracking algorithm

    Publication Year: 1992 , Page(s): 797 - 805
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | 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»

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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