IEEE Transactions on Aerospace and Electronic Systems

Volume 30 Issue 3 • July 1994

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Displaying Results 1 - 25 of 40
  • Comments on "The /spl alpha/-/spl beta/-/spl Gamma/ tracking filter with a noisy jerk as the maneuver model"

    Publication Year: 1994, Page(s):925 - 927
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (239 KB)

    In ibid, vol. AES-29, p.578-590 (Apr. 1993), J Sudano presented the optimal steady-state gains and associated error covariances for an /spl alpha/-/spl beta/-/spl Gamma/ filter with a piecewise constant jerk as a maneuver model. While the results given in that article are correct, the gains and error covariances can be found in a much simpler manner. The simplified expressions for the gains and th... View full abstract»

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  • Comments on "cancellation of specular and diffuse jammer multipath using a hybrid adaptive array"

    Publication Year: 1994, Page(s):932 - 933
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (189 KB)

    Prior work relating to the subject paper is noted here with respect to the performance analysis of a tapped delay line sidelobe canceler in the context of a simple specular two-path bandpass interference model.<> View full abstract»

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  • Commentary on Walton correspondence relating to the ILS glide slope

    Publication Year: 1994, Page(s):933 - 935
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (309 KB)

    The author suggests that the conclusions reached by Dr. Walton (see IEEE Transactions Antennas Propagation AP-33, p.908-917, (Aug. 1985)) are misleading. The instrument landing system (ILS) glide slope is a contemporary approach and landing aid which is a crucial element in maintaining air safety and preserving human life. For this reason an important goal has been to document carefully technical ... View full abstract»

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  • Cumulant-based blind optimum beamforming

    Publication Year: 1994, Page(s):722 - 741
    Cited by:  Papers (57)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1448 KB)

    Sensor response, location uncertainty, and use of sample statistics can severely degrade the performance of optimum beamformers. We propose blind estimation of the source steering vector in the presence of multiple, directional, correlated or coherent Gaussian interferers via higher order statistics. In this way, we employ the statistical characteristics of the desired signal to make the necessary... View full abstract»

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  • Synergism of binocular and motion stereo for passive ranging

    Publication Year: 1994, Page(s):709 - 721
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    Range measurements to objects in the world relative to mobile platforms such as ground or air vehicles are critical for visually aided navigation and obstacle detection/avoidance. An approach is presented that consists of a synergistic combination of two types of passive ranging method: binocular stereo and motion stereo. We show a new way to model the errors in binocular and motion stereo in conj... View full abstract»

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  • Multisensor distributed sequential detection

    Publication Year: 1994, Page(s):698 - 708
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    A conceptual generalization of the Wald's sequential probability ratio test (SPRT) to a decentralized environment is presented. The local tests are chosen to be SPRT's, which quantize the temporally independent identically distributed (IID) observations into three levels for transmission to the fusion detector. Spatial independence among the local observations is assumed. The fusion test is also a... View full abstract»

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  • Properties of the periodic ambiguity function

    Publication Year: 1994, Page(s):938 - 941
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The periodic ambiguity function (PAF) is a tool for analyzing the performance of a radar system utilizing a periodically modulated CW signal and a receiver matched to one or several periods thereof. Alternative definitions for the PAF are given and the properties of the PAF are elaborated The properties shown include periodicity, symmetry with respect to the origin and the volume limitation proper... View full abstract»

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  • Target tracking using infrared measurements and laser illumination

    Publication Year: 1994, Page(s):758 - 768
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (892 KB)

    A missile target tracker is designed using a filter/correlator (with adaptive target shape identification) based on forward-looking infrared (FLIR) sensor measurements to track the center-of-intensity of the hardbody/plume combination, and another filter using Doppler and/or speckle information in the return from a low-power laser illuminator to estimate the offset between the intensity centroid a... View full abstract»

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  • Decorrelation of broadband signals by Toeplitz-Block-Toeplitz structuring

    Publication Year: 1994, Page(s):685 - 697
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    We propose F-norm of the cross-correlation part of the array covariance matrix as a measure of correlation between the impinging signals and study the performance of different decorrelation methods in the broadband case using this measure. We first show that dimensionality of the composite signal subspace, defined as the number of significant eigenvectors of the source sample covariance matrix, co... View full abstract»

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  • Carrier and intermodulation performance of limiters excited by multicarriers

    Publication Year: 1994, Page(s):650 - 659
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    A general formula, using a Fourier-series representation, is derived for the input-output characteristic of ideal hard limiters, biased hard limiters and biased soft limiters. Using this formula one can obtain an expression, involving Bessel functions for calculating the amplitudes of the output products of a limiter excited by a multicarrier signal plus Gaussian noise. In contrast with previously... View full abstract»

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  • Modeling the protection system components of the space station electric power system

    Publication Year: 1994, Page(s):800 - 808
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    To facilitate protection system studies on the space station electric power system, there is a need to develop a model that can accurately and conveniently simulate both the power system and the protection system. Models for two major protective devices, the remote bus isolator and the remote power controller, are described. These models have been installed in a power system model resembling one c... View full abstract»

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  • Control system architecture for intelligent space robot

    Publication Year: 1994, Page(s):979 - 982
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    The outline of China's experimental ground testbed for space intelligent robot is described, followed by the realization processes of master/slave teleoperation, supervised autonomy control and discussion of other relevant problems View full abstract»

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  • Clutter covariance smoothing by subaperture averaging

    Publication Year: 1994, Page(s):941 - 945
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    Space-time processing has been proposed as an approach by which an airborne radar can adaptively detect small targets in the presence of ground clutter and jammers, provided the covariance matrix of the interference is available. One of the difficulties in estimating the covariance matrix is the need to obtain a sufficient number of independent samples, especially for high pulse-repetition-frequen... View full abstract»

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  • Flexible spacestructure control via moving-bank multiple model algorithms

    Publication Year: 1994, Page(s):750 - 757
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    The development and performance of moving-bank multiple model adaptive control (MMAC) algorithms for quelling vibrations induced in the SPICE 2 space structure are presented. The structure consists of a large platform and a smaller platform connected by three legs in a tripod fashion. Deviations of the line-of-sight (LOS) vector from the center of the large platform to the center of the smaller pl... View full abstract»

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  • A recursive multiple model approach to noise identification

    Publication Year: 1994, Page(s):671 - 684
    Cited by:  Papers (60)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB)

    Correct knowledge of noise statistics is essential for an estimator or controller to have reliable performance. In practice, however, the noise statistics are unknown or not known perfectly and thus need to be identified. Previous work on noise identification is limited to stationary noise and noise with slowly varying statistics only. An approach is presented here that is valid for nonstationary ... View full abstract»

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  • Asynchronous distributed detection

    Publication Year: 1994, Page(s):818 - 826
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    Binary parallel distributed-detection architectures employ a bank of local detectors to observe a common volume of surveillance, and form binary local decisions about the existence or nonexistence of a target in that volume. The local decisions are transmitted to a central detector, the data fusion center (DEC), which integrates them to a global target or no target decision. Most studies of distri... View full abstract»

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  • Monopulse-radar angle measurement in noise

    Publication Year: 1994, Page(s):950 - 957
    Cited by:  Papers (19)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    Angle-tracking accuracy in noise or noise jamming was quantified by this author in a previous paper for those monopulse radars which compute the monopulse ratio digitally from baseband signals, and which use those measurements only when the sum-channel envelope exceeds a detection threshold examined here in more detail is the impact of only receiver noise, in the absence of a hostile, electronic c... View full abstract»

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  • Data fusion of decentralized local tracker outputs

    Publication Year: 1994, Page(s):787 - 799
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    An approach for fusing offboard track-level data at a central fusion node is presented. The case where the offboard tracker continues to update its local track estimate with measurement and system dynamics models that are not necessarily linear is considered. An algorithm is developed to perform this fusion at a central node without having access to the offboard measurements, their noise statistic... View full abstract»

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  • The HAL-3 radar test set

    Publication Year: 1994, Page(s):919 - 924
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    This paper presents the HAL-3 radar test set (called the set in the following) used to measure the technical specifications of the HAL-3 airborne radar and to maintain it based on tested results. Some new techniques are employed in the set, including sinusoidal pulsewidth modulation (SPWM) in the power supply, digital gyro simulator and automatic test module (ATM) with STD industrial control micro... View full abstract»

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  • Tracking low elevation targets in the presence of multipath propagation

    Publication Year: 1994, Page(s):973 - 979
    Cited by:  Papers (24)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    A tracking algorithm based on a measurement model of the multipath propagation effects on the elevation angle measurements is presented. This algorithm does not depend on the specific signal processing and the prevailing environmental conditions. The results of simulations based on several scenarios are presented. The signal processing model used to generate the elevation measurements of a low-fly... View full abstract»

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  • Moving target imaging and trajectory computation using ISAR

    Publication Year: 1994, Page(s):887 - 899
    Cited by:  Papers (69)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (964 KB)

    Novel algorithms for moving target imaging and trajectory computation using a two-receiver radar are presented. The range-bin alignment is implemented with an adaptive method using the envelope correlation feature of different returns and the angular trajectory equation is solved using a linear least squares method combined with a unique phase-unwrapping technique. The angular positions of the syn... View full abstract»

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  • Resolution limits of ultra wideband synthetic aperture radar using a rectangular aperture for FFT processing

    Publication Year: 1994, Page(s):935 - 938
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    Formulas are derived for synthetic aperture radar range and cross-range resolution without restrictions on percentage bandwidth or integration angle. Restriction to rectangular apertures allows efficient FFT processing and weighting for sidelobe control. The optimum square aperture (equal resolution) and rectangular aperture (minimum resolution area) are derived View full abstract»

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  • Detection threshold selection for tracking performance optimization

    Publication Year: 1994, Page(s):742 - 749
    Cited by:  Papers (40)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    A technique for the evaluation of the track loss probability and the estimation error during track maintenance in clutter has been developed recently by the authors. This work overcomes the limitation of an earlier technique that does not handle the transient process of tracking divergence. Track loss, being a “runaway” phenomenon, clearly requires transient evaluation capability. The ... View full abstract»

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  • Efficient matched filter for the generalized chirp-like polyphase sequences

    Publication Year: 1994, Page(s):769 - 777
    Cited by:  Papers (15)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    The efficient implementation of the matched filter for the generalized chirp-like (GCL) polyphase sequences is presented. These sequences can be classified as the modulatable orthogonal sequences, because they can be modulated by a string of arbitrary complex numbers of unit magnitude, retaining the ideal periodic autocorrelation function and optimum crosscorrelation function. For the applications... View full abstract»

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  • On adaptive spatial-temporal processing for airborne surveillance radar systems

    Publication Year: 1994, Page(s):660 - 670
    Cited by:  Papers (249)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (788 KB)

    Implementing the optimum spatial-temporal (angle-Doppler) processor involves two crucial issues: the selection of processing configurations, and the development of adaptive algorithms which can efficiently approach the performance potential of the selected configuration. Among the three available configurations, the joint-domain, the cascade space-time, and the cascade time-space, this work shows ... 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
Michael Rice
Brigham Young University