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IEEE Transactions on Aerospace and Electronic Systems

Issue 4 • Date Jul 1990

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Displaying Results 1 - 14 of 14
  • Basic investigations on an angle measurement system using a laser

    Publication Year: 1990, Page(s):657 - 662
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    A novel, precise angle gauge is proposed. Incoming laser light is fed to the system through two separate condensing lenses. The phase difference between two rays is compensated by a phase modulator to hold a constant interference condition. The angle of the incoming light is measured by the modulation voltage. In comparison with conventional angle gauges, its advantages are high measurement accura... View full abstract»

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  • Simplified covariance matrix measurement in adaptive arrays

    Publication Year: 1990, Page(s):669 - 673
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    A procedure to measure the covariance matrix of an antenna array directly from the array sum port is described. The procedure involves specifically chosen sets of antenna weights that will allow the matrix components to appear at the array output. A parallel method of measuring the covariance matrix is also described. The accuracy requirements of the power measurements are examined analytically an... View full abstract»

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  • Identification and velocity computation of multiple moving objects in images

    Publication Year: 1990, Page(s):586 - 598
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (740 KB)

    Analysis for identifying and computing the velocity of multiple moving objects in sequences of images is presented. While previously published analyses addressed sequences with one or two moving objects, this analysis is extended to sequences with multiple moving objects. simulation is performed to demonstrate the applicability of this technique. Multiple moving objects appear in the spectral doma... View full abstract»

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  • Medium frequency broadcast of differential GPS data

    Publication Year: 1990, Page(s):607 - 617
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    The broadcast performance of DGPS (differential global positioning systems)/radio beacons is studied. It is found that a combination of receiver limiting and forward error corrections is very effective against the atmospheric noise which characterizes the MF band. This combination significantly reduces the probability of bit error and the average time between differential updates. The authors comp... View full abstract»

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  • Additional results on `reducing geometric dilution of precision using ridge regression'

    Publication Year: 1990, Page(s):677 - 681
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    R.J. Kelly (1990) presented preliminary results on the feasibility of using ridge regression to reduce the effects of geometric dilution of precision (GDOP) error inflation in position-fix navigation systems. Results indicate that the ridge technique will not reduce bias inflation due to the effects of GDOP in applications where bias-like measurement errors persist for time periods which greatly e... View full abstract»

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  • An analysis of modern versus classical homing guidance

    Publication Year: 1990, Page(s):599 - 606
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    Three terminal guidance laws incorporated in a generic interceptor are compared: first- and second-order modern guidance laws (MGLs), that are matched to the second-order autopilot of the interceptor, and proportional navigation (PN). The sensitivity of miss distance (MD) between the interceptor and a target to autopilot time constant, damping ratio, and update rate is shown. For the chosen interc... View full abstract»

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  • Optimal guidance for acceleration constrained missile and maneuvering target

    Publication Year: 1990, Page(s):618 - 624
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Explicit formulas of optimal guidance laws for an acceleration-constrained, arbitrary-order missile and maneuvering target are derived. These formulas are given in terms of the transfer function and acceleration constraint of the missile and the transfer function/shaping filter of the target. Optimal full-state feedback guidance law is synthesized against a target performing a barrel roll maneuver... View full abstract»

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  • Control system analysis of a hardware-in-the-loop simulation

    Publication Year: 1990, Page(s):666 - 669
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    A multivariable z-domain linear technique is presented for analyzing a simplified linear HWIL (hardware-in-the-loop) simulation model. Four complementary methods are given, consisting of singular value plots of the input LTF (loop transfer function), multivariable stability margins, closed-loop z-plane poles and zeros of the airframe, and the closed-loop system time response View full abstract»

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  • Continuous-time ECV and ECA track filters with colored measurement noise

    Publication Year: 1990, Page(s):663 - 666
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    Analytical solutions are presented for two continuous-time track filters with correlation in both the measurement errors and the target maneuvers. The measurement error model is a first-order Markov process, characterized by a correlation time (γ) and a position error variance (r). The target motion is described by one of two dynamic models: the exponentially correlated velocity (EC... View full abstract»

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  • Impact of target RCS fluctuations on radar measurement accuracy

    Publication Year: 1990, Page(s):685 - 686
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    The impact of target radar cross section (RCS) fluctuations on the thermal noise limited accuracy of radar measurements of range, range rate, and angle is evaluated for Swerling fluctuation models. The impact is expressed as a modification of the large-signal approximation to the standard deviation σ of measurement error View full abstract»

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  • Recursive 3-D motion estimation from a monocular image sequence

    Publication Year: 1990, Page(s):639 - 656
    Cited by:  Papers (140)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1452 KB)

    Consideration is given to the design and application of a recursive algorithm to a sequence of images of a moving object to estimate both its structure and kinematics. The object is assumed to be rigid, and its motion is assumed to be smooth in the sense that it can be modeled by retaining an arbitrary number of terms in the appropriate Taylor series expansions. Translational motion involves a sta... View full abstract»

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  • A new algorithm to optimize Barker code sidelobe suppression filters

    Publication Year: 1990, Page(s):673 - 677
    Cited by:  Papers (23)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The authors suggest a new algorithm for binary coding waveform sidelobe reduction after matched filtering and present a general method by which optimized sidelobe suppression filters for Barker codes can be obtained with a peak output sidelobe 2.62 dB lower than the results found in the literature (for 13-b Barker code). This optimization algorithm is also promising for other binary coding wavefor... View full abstract»

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  • On a decoupled multitarget tracking algorithm

    Publication Year: 1990, Page(s):681 - 685
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    An analysis is conducted of the optimality of a decoupled tracking filtering algorithm for addressing the problem of tracking multiple targets with correlated measurements and maneuvers. It is proved that the decoupled filters are, in general, suboptimal and are not in fact Kalman filters. However, it is shown also that if the standard Kalman filter is asymptotically stable, the decoupled filters ... View full abstract»

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  • Maneuver estimation using measurements of orientation

    Publication Year: 1990, Page(s):625 - 638
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1100 KB)

    An image-based algorithm which provides an estimate of the current radial acceleration of a target is studied. Since the data in a single image frame provide information only on the orientation of the target, a sequence of frames must be processed to detect maneuvers. The estimation problem is parameterized in terms of natural groupings of measurement errors, and the influence of these errors on 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. 

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Meet Our Editors

Editor-in-Chief
Lance Kaplan
Army Research Laboratory