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IEEE Transactions on Aerospace and Electronic Systems

Issue 2 • Apr 1994

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Displaying Results 1 - 25 of 36
  • A modified input estimation technique using pseudoresiduals

    Publication Year: 1994, Page(s):591 - 598
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    An adaptive tracking filter for maneuvering targets is proposed using modified input estimation technique. Pseudoresiduals are defined using measurements and the velocity estimate at the hypothesized maneuver onset time. With the pseudoresiduals and a new target model representing transitions of nominal accelerations, a new input estimation method for tracking a maneuvering target is derived. Sinc... View full abstract»

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  • Parameterization and adaptive control of space robot systems

    Publication Year: 1994, Page(s):435 - 451
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1152 KB)

    In space application, robot system are subject to unknown or unmodeled dynamics, for example, in the tasks of transporting an unknown payload or catching an unmodeled moving object. We discuss the parameterization problem in dynamic structure and adaptive control of a space robot system with an attitude-controlled base to which the robot is attached. We first derive the system kinematic and dynami... 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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  • 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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  • Emulating random process target statistics (using MSF)

    Publication Year: 1994, Page(s):556 - 577
    Cited by:  Papers (4)
    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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  • 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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  • Adaptive variable structure tracking control for constrained robots

    Publication Year: 1994, Page(s):493 - 503
    Cited by:  Papers (3)
    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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  • 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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  • Pade approximations of probability density functions

    Publication Year: 1994, Page(s):416 - 424
    Cited by:  Papers (54)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    The analysis of radar detection systems often requires extensive knowledge of the special functions of applied mathematics, and their computation. Yet, the moments of the detection random variable are often easily obtained. We demonstrate here how to employ a limited number of exactly specified moments to approximate the probability density and distribution functions of various random variables. T... View full abstract»

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  • On the generalization of true proportional navigation

    Publication Year: 1994, Page(s):545 - 555
    Cited by:  Papers (28)
    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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  • Resolution of an averaging paradox in the analysis of switched-mode DC-DC converters

    Publication Year: 1994, Page(s):626 - 632
    Cited by:  Papers (7)  |  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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  • 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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  • Rapid convergence by cascading Applebaum adaptive arrays

    Publication Year: 1994, Page(s):298 - 306
    Cited by:  Papers (4)
    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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  • Filters and algorithms for rotation rate detection in fiber-optic gyroscopes

    Publication Year: 1994, Page(s):511 - 517
    Cited by:  Papers (2)
    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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  • 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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  • 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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  • Space-time-frequency processing of synthetic aperture radar signals

    Publication Year: 1994, Page(s):341 - 358
    Cited by:  Papers (79)  |  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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  • Impulse radar evaluation of concrete, asphalt and waterproofing membrane

    Publication Year: 1994, Page(s):404 - 415
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (884 KB)

    Impulse radar has proved to be effective in the nondestructive testing of bridge decks composed of layers of dielectric materials such as asphalt, waterproofing membrane, and reinforced concrete. In this work, the waveform reflected from these materials are modeled and analyzed theoretically. The relative dielectric constants are measured using sample blocks, and the reflected radar waveform are r... 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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  • 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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  • SAR clutter suppression using probability density skewness

    Publication Year: 1994, Page(s):622 - 626
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    A clutter suppression algorithm is described which exploits asymmetry in the probability density function (pdf) of ground clutter in synthetic-aperture radar (SAR) imagery. In the log-magnitude domain, the probability densities of returns from natural ground clutter and man-made objects exhibit opposite skewness. Using Pearson's second coefficient of skewness, we have observed negative skewness va... View full abstract»

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  • Convergence rate of an SMI canceler in nonstationary noise

    Publication Year: 1994, Page(s):599 - 604
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    Convergence results for the sample matrix inversion (SMI) canceler algorithm in nonstationary noise are presented. Exact results are given for the convergence rate of the average output noise power residue of the canceler normalized to the quiescent average output noise power residue for a two-input canceler (one auxiliary), and lower and upper bounds are derived for cancelers with two or more inp... View full abstract»

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  • Coherent detection in Laplace noise

    Publication Year: 1994, Page(s):452 - 461
    Cited by:  Papers (13)
    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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  • Analysis of CFAR performance in Weibull clutter

    Publication Year: 1994, Page(s):315 - 329
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1224 KB)

    Recent interest has focused on order statistic-based (OS-based) algorithms for calculating radar detection thresholds. Previous analyses of these algorithms are extended, to determine closed-form approximations for the signal-to-clutter ratio required to achieve a particular probability of detection in clutter environments whose amplitude statistics are modeled by the Weibull distribution, and whe... View full abstract»

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  • A class of near optimal JPDA algorithms

    Publication Year: 1994, Page(s):504 - 510
    Cited by:  Papers (53)
    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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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