IEEE Transactions on Aerospace and Electronic Systems

Issue 4 • Oct. 1999

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Displaying Results 1 - 25 of 37
  • Author index

    Publication Year: 1999, Page(s):1480 - 1485
    Cited by:  Papers (1)
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  • Subject index

    Publication Year: 1999, Page(s):1485 - 1503
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  • Impact angle control for planar engagements

    Publication Year: 1999, Page(s):1439 - 1444
    Cited by:  Papers (109)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (328 KB)

    A new and practical terminal guidance law is presented for impact angle control for two-dimensional active homing engagement scenarios. Impact angle control is required to enhance terminal effectiveness of antitank and antiship missile systems in particular. The proposed guidance law is developed to cope with missile velocity reduction due to aerodynamic drag and target maneuver. In actual applica... View full abstract»

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  • Performance of a dual channel matched filter system

    Publication Year: 1999, Page(s):1429 - 1438
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (548 KB)

    We analyze the signal-to-interference plus noise ratio (SINR) performance of a dual channel matched filter system under the assumption that the input interference plus noise signal for one channel is uncorrelated with the input signal for the other channel. We develop an exact expression for the normalized SINR as a function of random variables with known distributions and then, using a Taylor ser... View full abstract»

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  • Multiband coherent radar detection against compound-Gaussian clutter

    Publication Year: 1999, Page(s):1266 - 1282
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (888 KB)

    A Multiband GLRT-LQ (Generalized Likelihood Ratio Test-Linear Quadratic), MBGLRT-LQ, detector is derived for the coherent radar target detection against a compound-Gaussian clutter background. This scheme is an extension to the multiband case of the Asymptotically Optimum Detector (AOD), also derived under the name of GLRT-LQ in. The proposed multiband version of the algorithm shows two main advan... View full abstract»

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  • Multipath interferometry technique for airborne array calibration

    Publication Year: 1999, Page(s):1369 - 1382
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (908 KB)

    A new technique is developed to compensate multiple-wavelength distortion in airborne antenna arrays. This approach exploits the phase information in microwave reflections from arbitrary terrain. To handle reflections incident over a broad angle, a range-Doppler preprocessor is used in each element channel to resolve wavefronts incident simultaneously from different directions. The phase informati... View full abstract»

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  • Pade approximations to Rician statistical functions

    Publication Year: 1999, Page(s):1421 - 1428
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (440 KB)

    Approximations are derived for the statistical functions that characterize the matched filter output amplitude given a non-fluctuating point target and an arbitrary clutter model. The approximations are the inverse Hankel transform of a Pade approximation to their associated characteristic functions (CF) and can be used to calculate receiver operating characteristics (ROCs) View full abstract»

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  • Estimation of the parameters of the K-distribution using higher order and fractional moments [radar clutter]

    Publication Year: 1999, Page(s):1453 - 1457
    Cited by:  Papers (63)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (260 KB)

    We propose a method for estimating the parameters of the K-distribution in a manner which significantly reduces computational requirements when compared with existing approaches. Additionally, the method yields parameter estimates with lower variance when compared with standard techniques View full abstract»

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  • Performance bounds for hot and cold clutter mitigation

    Publication Year: 1999, Page(s):1253 - 1265
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (848 KB)

    A new method is presented for describing the theoretical interference space-time covariance matrix that will be observed in an adaptive airborne radar system under specific topographical conditions. Both hot clutter that is induced by interfering sources and cold clutter that results from the radar transmitter are considered. This method incorporates phenomenology observed under site specific cond... View full abstract»

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  • Overview of multiple satellite communication networks

    Publication Year: 1999, Page(s):1362 - 1368
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (488 KB)

    Recently interest in packet communications has stimulated an interest in constellations of low altitude satellites. Such a configuration would have less propagation delay and be cheaper to launch than satellites at higher or geosynchronous altitude. However, many more satellites are necessary at low altitude to achieve reasonable coverage of the earth and insure availability of the resource. Furth... View full abstract»

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  • Performance of distributed CFAR test under various clutter amplitudes

    Publication Year: 1999, Page(s):1410 - 1419
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (624 KB)

    We evaluate the performances of several distributed constant false-alarm rate (CFAR) tests operating in different background clutter conditions. The analysis considers the detection of Rayleigh target in various clutters with the possibility of differing clutter power levels in the test cells of distributed radars. Numerical results studied for a two-radar system show how the false-alarm rate of t... View full abstract»

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  • Integer ambiguity resolution in GPS for spinning spacecrafts

    Publication Year: 1999, Page(s):1219 - 1229
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (600 KB)

    A procedure to compute the integer ambiguity problem when a GPS receiver is used in a multiple antenna configuration attached to a rotating spacecraft is presented. The method is applied to a simulation of an experimental satellite which uses the GPS receiver for attitude determination View full abstract»

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  • Spectral distortion in pulsed class-C amplifiers

    Publication Year: 1999, Page(s):1450 - 1453
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (220 KB)

    An important problem in solid-state radar transmitters using class-C pulsed amplifiers is the spectral distortion generated during the fall time of the RF pulse. The widening of the spectrum is commonly corrected with cavity filters. In this paper, the sources and the nature of such a distortion are explained. A novel technique to avoid it based on bias modulation of a low power stage at the begin... View full abstract»

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  • Autofocusing of ISAR images based on entropy minimization

    Publication Year: 1999, Page(s):1240 - 1252
    Cited by:  Papers (259)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (748 KB)

    A novel autofocusing technique is developed for random translational motion compensation in inverse synthetic aperture radar (ISAR) imaging of objects. This technique is based on an entropy minimization principle and validated via a nonparametric estimation method. Images of a simulation and a real flying aircraft are used for illustration. Images of encouraging quality confirm the feasibility of ... View full abstract»

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  • Passive localization of frequency-agile radars from angle and frequency measurements

    Publication Year: 1999, Page(s):1129 - 1144
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (820 KB)

    It is well known that the position of a stationary radar can be estimated by a single moving observer from angle and/or frequency measurements taken passively at different points in its trajectory. Depending on the measurement set different localization methods result: the bearing method (BM), the frequency method (FM), and the combined method (CM). Previous studies analyze the three methods on th... View full abstract»

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  • Time delay estimation with multiple looks in colored Gaussian noise

    Publication Year: 1999, Page(s):1354 - 1361
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (348 KB)

    We present an efficient algorithm for high resolution time delay estimation in colored Gaussian noise with multiple looks. By using a relaxation-based optimization approach and exploiting the Toeplitz property of the noise covariance matrix, the enhanced new algorithm can achieve the corresponding Cramer-Rao bounds (CRBs) with a very small number of independent looks View full abstract»

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  • Partial eigenstructure assignment algorithm in flight control system design

    Publication Year: 1999, Page(s):1403 - 1409
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (312 KB)

    A new algorithm is proposed for assigning some of the eigenvalues to the desired places while guaranteeing the stability of the closed-loop system. For partial eigenstructure assignment, the null space approach is utilized, and additional feedback is used to stabilize the remaining eigenvalues. The quadratic type performance index is chosen to determine the additional feedback gain lying on the co... View full abstract»

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  • Adaptive nulling of SAR sidelobe discretes

    Publication Year: 1999, Page(s):1212 - 1218
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (348 KB)

    By using adaptive subarrays for crossrange imaging we have developed a computationally simple method that removes any image degradation caused by strong, discrete clutter located in the crossrange sidelobes of a synthetic aperture radar (SAR) image. The procedure is based on the minimization of the mean interference power with the constraint that the image of a desired scatterer is undistorted. Th... View full abstract»

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  • Predicting the visibility of LEO satellites

    Publication Year: 1999, Page(s):1183 - 1190
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (448 KB)

    We present a simple algorithm to determine the visibility-time function of a circular low Earth orbit (LEO) satellite at a terminal on the Earth's surface. The simplicity of the algorithm is based on approximating the ground trace of the satellite (which is not a great circle due to Earth's rotation) during a time interval of the order of in-view period, by a great-circle are. This enables us to u... View full abstract»

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  • Single-phase three-level rectifier and random PWM inverter drives

    Publication Year: 1999, Page(s):1334 - 1343
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (568 KB)

    A novel ac/dc/ac converter topology with three-level pulsewidth modulated (PWM) scheme for the single-phase ac/dc rectifier and random PWM scheme for ac drives is proposed. In order to improve the power quality in the single-phase rectifier, a ROM-based (read-only memory) control scheme, based on hysteresis current comparator, region detector, and capacitor compensator, is used to achieve a sinuso... View full abstract»

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  • Wideband quadrature error correction (using SVD) for stepped-frequency radar receivers

    Publication Year: 1999, Page(s):1444 - 1449
    Cited by:  Papers (11)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (348 KB)

    We present a new technique which corrects the wideband quadrature errors associated with homodyne stepped frequency radar receivers. The correction algorithm is derived using singular value decomposition (SVD) which diagonalizes and scales the covariance matrix of a test signal while preserving the coherent phasor alignment across all frequency steps of the homodyne receiver. Using our technique, ... View full abstract»

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  • Alternate forms of the PWM switch models

    Publication Year: 1999, Page(s):1283 - 1292
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (512 KB)

    Vorperian's pulsewidth modulation (PWM) switch model consists of a PWM transformer and a nonlinear resistor. The recognition that any of the three transformer terminals can serve as the common terminal leads to two alternate PWM transformer models and the corresponding two alternate PWM switch models. For a given PWM dc-dc converter, one of the three PWM switch models is more “natural”... View full abstract»

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  • Probability of error for BPSK modulation from electrostatic interference [in orbital situation]

    Publication Year: 1999, Page(s):1383 - 1387
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (232 KB)

    In an orbital situation any spacecraft is bombarded by charged particles that span a broad range of energies. Some of the particles may be trapped within the materials of the spacecraft. Recent data indicates that an S-band phased-array antenna on a spacecraft may experience electrostatic discharges from such ion deposition at the elements of the array. These discharges may induce RF interference ... View full abstract»

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  • On distributed signal detection with multiple local free parameters

    Publication Year: 1999, Page(s):1457 - 1466
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (596 KB)

    In this work, we propose an efficient approach to the optimization of distributed multiradar systems with parallel topology, employing decision fusion from local detectors with discrete and continuous free design parameters. This approach, termed hierarchical optimization approach, can be applied to a variety of optimization criteria including the Neyman-Pearson (NP) and the locally optimum detect... View full abstract»

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  • Dynamic modeling and controller design of flyback converter

    Publication Year: 1999, Page(s):1230 - 1239
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (528 KB)

    The accurate dynamic modeling and quantitative controller design for an isolated converter with optocoupler isolation in its feedback loop are considered to be difficult issues, since the transfer characteristics of some blocks are highly nonlinear and difficult to be modeled analytically. First a current-mode controlled flyback converter with an optically isolated feedback path is designed. Then ... 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
Michael Rice
Brigham Young University