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IEEE Transactions on Aerospace and Electronic Systems

Issue 2 • Date Apr 2001

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Displaying Results 1 - 25 of 34
  • Output voltage bounds of a three-phase boost rectifier

    Publication Year: 2001, Page(s):671 - 678
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB) | HTML iconHTML

    A general closed-form duty cycle control law is derived based on the linear combination of two sets of continuous duty cycle control laws. From this general solution one can generate infinitely many pulsewidth modulation (PWM) control strategies to achieve the same ideal performance. Then, from the resulting closed-form solution, a general explicit lower bound and a general explicit upper bound of... View full abstract»

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  • Nonlinear filtering: A hybrid approximation scheme

    Publication Year: 2001, Page(s):470 - 480
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1088 KB) | HTML iconHTML

    This paper is concerned with nonlinear filtering schemes for systems which allow non-Gaussian noise. Using the most probable trajectory (MPT) approach, a finite-dimensional recursive hybrid filtering scheme is derived. By appropriately selecting a switching process, a linear hybrid system can be obtained that approximates the original nonlinear system. Then the MPT approach is used to obtain the h... View full abstract»

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  • Alternate forms of the PWM switch model in discontinuous conduction mode [DC-DC converters]

    Publication Year: 2001, Page(s):754 - 758
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB) | HTML iconHTML

    A pulsewidth-modulated (PWM) DC-DC converter enters discontinuous conduction mode (DCM) as its inductor current attempts to reverse direction, but cannot do so because of switch implementation, and remains at zero in the last interval of each switching period. Three equivalent three-terminal nonlinear transformers are described as the models for the PWM switch in a DCM converter, each having one o... View full abstract»

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  • On-line gain-tuning IP controller using RFNN

    Publication Year: 2001, Page(s):655 - 670
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1236 KB) | HTML iconHTML

    In this study an integral-proportional (IP) controller with on-line gain-tuning using a recurrent fuzzy neural network (RFNN) is proposed to control the mover position of a permanent magnet linear synchronous motor (PMLSM) servo drive system. The structure and operating principle of the PMLSM are first described in detail. A field-oriented control PMLSM servo drive is then introduced. After that, ... View full abstract»

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  • Monopulse DOA estimation of two unresolved Rayleigh targets

    Publication Year: 2001, Page(s):452 - 469
    Cited by:  Papers (49)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1476 KB) | HTML iconHTML

    This paper provides for new approaches to the processing of unresolved measurements as two direction-of-arrival (DOA) measurements for tracking closely spaced targets rather than the conventional single DOA measurement of the centroid. The measurements of the two-closely spaced targets are merged when the target echoes are not resolved in angle, range, or radial velocity (i.e., Doppler processing)... View full abstract»

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  • Receiver operating characteristics for the coherent UWB random noise radar

    Publication Year: 2001, Page(s):586 - 594
    Cited by:  Papers (28)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB) | HTML iconHTML

    An ultrawideband (UWB) random-noise radar operating in the 1-2 GHz frequency band has been developed and held-tested at a 200 m range at the University of Nebraska. A unique heterodyne correlation technique based on a delayed transmitted waveform using a photonic delay line has been used to inject coherence within this system. The performance of this radar, assuming a point target, has been invest... View full abstract»

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  • Recursive method for optimum GPS satellite selection

    Publication Year: 2001, Page(s):751 - 754
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB) | HTML iconHTML

    The author addresses the problem of selecting an optimum n-satellite subset from m visible satellites (m>n). The optimality criteria is minimum geometric dilution of precision (GDOP) subject to the integrity constraint. To solve this problem an efficient algorithm is developed using a revolving door method and matrix inversion lemma. The revolving door method generates each n-subset from its im... View full abstract»

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  • Support vector machines for SAR automatic target recognition

    Publication Year: 2001, Page(s):643 - 654
    Cited by:  Papers (112)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1140 KB) | HTML iconHTML

    Algorithms that produce classifiers with large margins, such as support vector machines (SVMs), AdaBoost, etc, are receiving more and more attention in the literature. A real application of SVMs for synthetic aperture radar automatic target recognition (SAR/ATR) is presented and the result is compared with conventional classifiers. The SVMs are tested for classification both in closed and open set... View full abstract»

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  • Central limit theorem: Use with caution

    Publication Year: 2001, Page(s):739 - 740
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB) | HTML iconHTML

    The validity of the Central Limit Theorem for the sum of N, K distributed random phasors is investigated. It is demonstrated that the number of phasors that must be summed to obtain an amplitude distribution that can be approximated by a Rayleigh depends strongly on the underlying K-distribution, and is of order 200 for Weibull statistics View full abstract»

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  • Airborne GMTI radar position bias estimation using static-rotator targets of opportunity

    Publication Year: 2001, Page(s):695 - 699
    Cited by:  Papers (14)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB) | HTML iconHTML

    In target tracking systems: using GMTI (ground moving target indicator) radars on airborne platforms, the locations of these platforms are available from GPS-based estimates. However, these estimated locations are subject to errors that are, typically, stationary autocorrelated random processes, i.e., slowly varying biases. In situations where there are no known-location targets to estimate these ... View full abstract»

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  • Adaptive digital beamforming for angle estimation in jamming

    Publication Year: 2001, Page(s):508 - 523
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1636 KB) | HTML iconHTML

    A radar digital beamforming (DBF) architecture and processing algorithm is described for nulling the signal from a mainlobe electronic jammer and multiple sidelobe electronic jammers while maintaining monopulse angle estimation accuracy on the target. The architecture consists of a sidelobe jamming (SLJ) cancelling adaptive array (AA) followed by a mainlobe jamming (MLJ) canceller. A mainlobe main... View full abstract»

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  • Random hysteresis PWM inverter with robust spectrum shaping

    Publication Year: 2001, Page(s):619 - 629
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (940 KB) | HTML iconHTML

    A hysteresis current-controlled pulsewidth modulation (PWM) scheme is simple and robust in switching control, but it is subject to not constant switching frequency. However, since its harmonic spectrum is not randomly distributed like those yielded by the random PWM (RPWM) scheme, the annoying harmonic effects still exist. A random switching control strategy is proposed here to let the harmonic sp... View full abstract»

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  • Improved SAR target detection via extended fractal features

    Publication Year: 2001, Page(s):436 - 451
    Cited by:  Papers (22)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2112 KB) | HTML iconHTML

    The utility of the extended fractal (EF) feature is evaluated for the enhancement of the focus of attention (FOA) stage of a synthetic aperture radar (SAR) automatic target recognition (ATR) system. Unlike more traditional SAR detection features that distinguish target pixels from the background only on the basis of contrast, the EF feature is sensitive to both the contrast and size of objects. Fu... View full abstract»

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  • Fuzzy-logic-based CLOS guidance law design

    Publication Year: 2001, Page(s):719 - 727
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB) | HTML iconHTML

    A fuzzy-logic-based command to line-of-sight (CLOS) guidance law is proposed. In this design, the guidance problem is converted to the tracking problem. Then the fuzzy controller is designed to achieve satisfactory tracking performance. Meanwhile, an on-line tuning factor is introduced to speed up the convergence of tracking error and to reduce the miss distance. Besides, a CLOS compensator is des... View full abstract»

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  • Surface movement radar data processing methods for airport surveillance

    Publication Year: 2001, Page(s):563 - 585
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2076 KB) | HTML iconHTML

    An airport surveillance function operating on surface movement radar (SMR) images is proposed and evaluated. The main contributions presented are the statistical error models of the target centroid and attributes extracted from radar images, developed and applied to the design of its main data processing blocks. Besides a multihypothesis image-to-tracks assignment method, a tracking filter using t... View full abstract»

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  • Direction finding/polarization estimation-dipole and/or loop triad(s)

    Publication Year: 2001, Page(s):679 - 684
    Cited by:  Papers (50)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB) | HTML iconHTML

    This paper shows (1) how measurement of the three Cartesian components of the electrical-field or magnetic-field suffices for multisource azimuth/elevation direction finding and polarization estimation, and (2) how the vector cross-product direction-of-arrival estimator is fully applicable even when the dipole triad is arbitrarily displaced from the loop triad View full abstract»

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  • Passive ranging of a low observable ballistic missile in a gravitational field

    Publication Year: 2001, Page(s):481 - 494
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1292 KB) | HTML iconHTML

    In this paper we present an estimation algorithm for tracking the motion of a low-observable target in a gravitational field, for example, an incoming ballistic missile (BM), using angle-only measurements. The measurements, which are obtained from a single stationary sensor, are available only for a short time. Also, the low target detection probability and high false alarm density present a diffi... View full abstract»

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  • Motion detection using TDOA and FDOA measurements

    Publication Year: 2001, Page(s):759 - 764
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB) | HTML iconHTML

    A stationary transmitter can be located using two moving receivers using time and frequency difference of arrival (TDOA/FDOA). However, transmitter motion will cause a bias on the FDOA, resulting in inaccurate locations. If motion is detected, the position is known to be inaccurate. This paper contains two algorithms for detecting motion using TDOA and FDOA measurements. The distribution for the t... View full abstract»

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  • Multiaspect classification of airborne targets via physics-based HMMs and matching pursuits

    Publication Year: 2001, Page(s):595 - 606
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1172 KB) | HTML iconHTML

    Wideband electromagnetic fields scattered from N distinct target-sensor orientations are employed for classification of airborne targets. Each of the scattered waveforms is parsed via physics-based matching pursuits, yielding N feature vectors. The feature vectors are submitted to a hidden Markov model (HMM), each state of which is characterized by a set of target-sensor orientations over which th... View full abstract»

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  • Efficient multisensor fusion using multidimensional data association

    Publication Year: 2001, Page(s):386 - 400
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1324 KB) | HTML iconHTML

    We present the development of a multisensor fusion algorithm using multidimensional data association for multitarget tracking. The work is motivated by a large scale surveillance problem, where observations from multiple asynchronous sensors with time-varying sampling intervals (electronically scanned array (ESA) radars) are used for centralized fusion. The combination of multisensor fusion with m... View full abstract»

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  • Passive polarimetric IR target classification

    Publication Year: 2001, Page(s):740 - 751
    Cited by:  Papers (17)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1400 KB) | HTML iconHTML

    Automatic detection and recognition of targets by means of passive IR sensors suffer from limitations due to lack of sufficient contrast between the targets and, their backgrounds and among the facets of a target. A set of novel algorithms is designed and tested that uses the target and background Stokes parameters for detection, segmentation, and classification of targets, In these algorithms, it... View full abstract»

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  • FPGA-based adaptive tracking estimation computer

    Publication Year: 2001, Page(s):699 - 706
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB) | HTML iconHTML

    We describe an FPGA-based adaptive tracking estimation computer (FATEC) for a multiple target tracking (MTT) radar system. Its design is centered around a small processor core customized according to the requirements of tracking application, to run the main control program and provide software flexibility, with a number of tracking algorithms (models) implemented in hardware-type functional units,... View full abstract»

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  • MTI data clustering and formation recognition

    Publication Year: 2001, Page(s):524 - 537
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1464 KB) | HTML iconHTML

    Image exploitation technology approaches have generally focused on the detection and spatial analysis of stationary groups of objects on the ground using various sensors. While spatial arrangement is clearly necessary in analyzing military formations, it is usually not sufficient. Typically the arrangement must be examined within some context in order to interpret a pattern of deployment. For movi... View full abstract»

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  • High resolution 3D “snapshot” ISAR imaging and feature extraction

    Publication Year: 2001, Page(s):630 - 642
    Cited by:  Papers (41)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1004 KB) | HTML iconHTML

    We have developed a new formulation for three dimensional (3D) radar imaging of inverse synthetic aperture radar (ISAR) data based on recent developments in high resolution spectral estimation theory. Typically for non real-time applications, image formation is a two step process consisting of motion determination and image generation. The technique presented focuses on this latter process, and as... View full abstract»

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  • Improved Kalman filter design for three-dimensional radar tracking

    Publication Year: 2001, Page(s):727 - 739
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (932 KB) | HTML iconHTML

    The problem of three-dimensional (3D) radar tracking is considered. The usual tracking filter design relying on first-order (or linear) approximations leads to poor convergence and erratic filter behavior in highly nonlinear situations. Simple filter algorithms that can overcome these ill effects are developed for two different types of 3D radar measurement. For each type of radar measurement, an ... 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
Lance Kaplan
Army Research Laboratory