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IEEE Transactions on Aerospace and Electronic Systems

Issue 2 • Date Apr 1994

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Displaying Results 1 - 25 of 36
  • Filters and algorithms for rotation rate detection in fiber-optic gyroscopes

    Publication Year: 1994, Page(s):511 - 517
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    A digital filter structure and processing scheme is being presented, featuring a minimum hardware effort and efficient means of computing rotation rates in fiber-optic gyroscopes. Its advantages over current analog and digital detection methods are pointed out. The problem of aliasing and quantization in digital filters limiting system performance is addressed. Test results document successful imp... View full abstract»

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  • A class of near optimal JPDA algorithms

    Publication Year: 1994, Page(s):504 - 510
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    The crucial problem in multiple target tracking is the hit-to-track data association. A hit is a received signal from a target or background clutter which provides positional information If an incorrect hit is associated with a track, that track could diverge and prematurely terminate or cause other tracks to also diverge. Most methods for hit-to-track data association fall into two categories: mu... View full abstract»

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  • Adaptive variable structure tracking control for constrained robots

    Publication Year: 1994, Page(s):493 - 503
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    The problem of controller design for constrained robots with the consideration of computational efficiency is addressed. An efficient adaptive variable structure control algorithm based on a reduced dynamics formulation, is presented for trajectory tracking of an end-effector on a constrained surface with specified constraint forces. It is shown that the objective can be achieved without exact kno... View full abstract»

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  • Estimation of the covariance matrix for dependent signal samples: polarization diversity systems

    Publication Year: 1994, Page(s):484 - 492
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    The problem of the estimation of covariance matrices in multichannel radar system when signal samples are statistically dependent is addressed. An optimal maximum likelihood (ML) estimate is derived. Probability characteristics and sensitivity to signal models of the estimate are evaluated for a polarization diversity system View full abstract»

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  • Distributed computation in linear networks: closed-form solutions

    Publication Year: 1994, Page(s):471 - 483
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    A linear network of communicating processors is analyzed. The processors in the network may or may not be equipped with front-end processors. The processing load originates either at the boundary or at the interior of the network. Closed-form solutions and computational techniques are presented for the above situations, to obtain time optimal distribution of processing loads on the processors. Som... View full abstract»

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  • Emulating random process target statistics (using MSF)

    Publication Year: 1994, Page(s):556 - 577
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1620 KB)

    The topics of matrix spectral factorization (MSF) in conjunction with results from realization theory are applied here in simulating a stationary multi-input/multi-output (MIMO) linear system from a specified power spectral density matrix. MSF provides the appropriate transfer function matrix and realization theory specifies the corresponding parameters of a linear system having this transfer func... View full abstract»

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  • HF multipath passive single site radio location

    Publication Year: 1994, Page(s):462 - 470
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    This paper considers the problem of passive geolocation for the case of HF multipath propagation. A new technique is developed for the estimation of interpath time delay applying the multiple signal classification (MUSIC) superresolution spectral estimation method. The technique samples the signals received by two spatially separated antennas to compute the normalized MUSIC cepstrum. The method is... View full abstract»

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  • Space-time-frequency processing of synthetic aperture radar signals

    Publication Year: 1994, Page(s):341 - 358
    Cited by:  Papers (62)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1296 KB)

    The subject of this work is the detection and high resolution microwave imaging of objects moving on the ground and observed by an airborne radar. The proposed approach is based on a combined space-time and time-frequency processing. The space-time processing makes use of a linear array antenna and exploits the radar motion for filtering the received echoes in order to improve as much as possible ... View full abstract»

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  • Performance prediction in compound-Gaussian clutter

    Publication Year: 1994, Page(s):611 - 616
    Cited by:  Papers (42)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The paper deals with the performance prediction of conventional receivers in non-Gaussian disturbance. The analysis is carried out for compound-Gaussian clutter plus thermal noise although the emphasis here is on a clutter-dominated environment. In this case, closed-form expressions for the false alarm rate are also given. A sensitivity analysis of the detection schemes to the statistical model fo... View full abstract»

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  • Adaptive model architecture and extended Kalman-Bucy filters

    Publication Year: 1994, Page(s):525 - 533
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    In radar systems, extended Kalman-Bucy filters (EKBFs) are used to estimate state vectors of objects in track. Filter models accounting for fundamental aerodynamic forces on reentry vehicles are well known. A general model structure accommodating the dynamics of reentry vehicles in both exoatmospheric and endoatmospheric flight is presented. The associated EKBFs for these various models are descri... View full abstract»

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  • Rapid convergence by cascading Applebaum adaptive arrays

    Publication Year: 1994, Page(s):298 - 306
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    An adaptive array architecture is described which has improved convergence speed over the conventional Applebaum array when the eigenvalue spread of the input signal covariance matrix is large. The architecture uses N+1 Applebaum adaptive arrays in a two-layer cascaded configuration. The gain constants in the first layer are set so that large interfering sources are quickly nulled, but small inter... View full abstract»

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  • On the generalization of true proportional navigation

    Publication Year: 1994, Page(s):545 - 555
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (748 KB)

    A simple framework to define generalized true proportional navigation (GTPN) guidance laws is presented. It is shown that this framework subsumes many of the generalizations presented in the earlier literature. The capture regions of a number of GTPN guidance laws are obtained through a rigorous qualitative analysis. The method of analysis is simpler and lends itself directly to an easy geometrica... View full abstract»

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  • Coherent detection in Laplace noise

    Publication Year: 1994, Page(s):452 - 461
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    The discrete-time detection of a time-varying, additive signal in independent Laplace noise is considered. Previous efforts in this area have been restricted to the constant signal, and identically distributed noise case. Theoretical (closed form) expressions for the false alarm and detection probabilities are developed for both the Neyman-Pearson optimal detector and the classical matched filter ... View full abstract»

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  • A PDF multitarget tracker

    Publication Year: 1994, Page(s):386 - 403
    Cited by:  Papers (20)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1272 KB)

    A probability density function (pdf) based approach to the multitarget tracking problem is presented. The input data are obtained by measurements over time from a front-end detector. The desired output is the number of targets present and the parameters of each target. The same approach has previously been used for time delay detection and tracking problems and is adapted to this problem This appr... View full abstract»

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  • Resolution of an averaging paradox in the analysis of switched-mode DC-DC converters

    Publication Year: 1994, Page(s):626 - 632
    Cited by:  Papers (6)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    The validity of an intuitive averaging method for estimating the low-frequency signals in switch-mode systems is rigorously examined It is shown that the approach may lead to erroneous results because it violates the Nyquist sampling theorem and that the resulting aliasing effects may interfere with the estimate of the low-frequency component of the signal. A procedure is proposed to estimate the ... View full abstract»

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  • Coherent detection of radar targets in a non-gaussian background

    Publication Year: 1994, Page(s):330 - 340
    Cited by:  Papers (151)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (916 KB)

    The problem of detecting radar targets against a background of coherent, correlated, non-Gaussian clutter is studied with a two-step procedure. In the first step, the structure of the amplitude and the multivariate probability density functions (pdfs) describing the statistical properties of the clutter is derived. The starting point for this derivation is the basic scattering problem, and the sta... View full abstract»

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  • Pade approximations for detectability in K-clutter and noise

    Publication Year: 1994, Page(s):425 - 434
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The Pade approximation (PA) method is used to analyze the detection performance of single and multiple pulse radar systems operating in K-distributed clutter and thermal noise. Simple approximations for false-alarm and detection probabilities are obtained, using lower order moments for the detection decision statistic. Both envelope and squaring detector laws are considered, with noncoherent integ... View full abstract»

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  • Addendum to “Noise factor and antenna gains in the signal/noise equation for over-the-horizon radar”

    Publication Year: 1994
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (48 KB)

    The definition of q and vT in the eqn. (7) of the above article (see ibid, vol. 27, no. 6 (Nov. 1991)), is modified View full abstract»

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  • A novel method of using waveform-generators for sine pulsewidth modulation

    Publication Year: 1994, Page(s):606 - 611
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    A novel method is presented of using waveform-generators for generating the sine pulsewidth modulation (PWM) control signals for a bridge inverter. The frequencies of the reference sine and synchronized triangular waveforms needed for PWM can be varied simultaneously over a wide range. Experimental waveforms of control circuit and inverter are given View full abstract»

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  • Multiresolutional multiple-model target tracking

    Publication Year: 1994, Page(s):518 - 524
    Cited by:  Papers (48)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    A multiresolutional multiple-model target tracking algorithm is developed which uses the wavelet transform as a means for mapping data between different resolution levels. The algorithm is effective for tracking maneuvering targets given measurements with a low S/N ratio View full abstract»

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  • Evaluating a multiple-hypothesis multitarget tracking algorithm

    Publication Year: 1994, Page(s):578 - 590
    Cited by:  Papers (16)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (908 KB)

    The performance evaluation of multiple-hypothesis, multitarget tracking algorithm is presented. We are primarily interested in target-detection/track-initiation capabilities as measures of performance. Through Monte Carlo simulations, a multiple-hypothesis tracking algorithm was evaluated in terms of 1) probability of establishing a track from target returns and 2) false track density. A radar was... View full abstract»

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  • The optimal distribution of search effort: existence, uniqueness and the minimax solution

    Publication Year: 1994, Page(s):359 - 366
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    The detection search problem, one of distributing limited resources so as to maximize the detection probability in the single-try search for a concealed target with known probability density, is analyzed. Under fairly general assumptions, the optimal search density uniquely exists when the detection index is governed by the law of diminishing returns and another simple regularity condition. Numeri... View full abstract»

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  • Subaperture autofocus for synthetic aperture radar

    Publication Year: 1994, Page(s):617 - 621
    Cited by:  Papers (49)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    A subaperture autofocus algorithm for synthetic aperture radar (SAR) partitions range-compressed phase-history data collected over a full aperture into equal-width subapertures. Application of a one-dimensional Fourier transform to each range bin converts each subaperture data set into a full-scene image (map). Any linear phase difference, or phase ramp, between a pair of subapertures expresses it... View full abstract»

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  • Constant frequency resonant DC/DC converters with zero switching losses

    Publication Year: 1994, Page(s):534 - 544
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (716 KB)

    This paper presents two distinct resonant DC/DC converter topologies which operate at a constant frequency and exhibit near zero switching losses. The proposed topologies also feature 1) near zero turn-on turn-off and snubber losses, 2) low voltage stresses across the switches of the full-bridge and output diodes, 3) reduced requirements for output filter, and 4) no added penalty on conduction los... View full abstract»

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  • Optimal sensor selection strategy for discrete-time state estimators

    Publication Year: 1994, Page(s):307 - 314
    Cited by:  Papers (57)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    A novel sensor selection strategy is introduced, which can be implemented on-line in time-varying discrete-time system. We consider a case in which several measurement subsystem are available, each of which may be used to drive a state estimation algorithm. However, due to practical implementation constraints (such as the ability of the on-board computer to process the acquired data), only one of ... 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