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IEEE Transactions on Aerospace and Electronic Systems

Issue 3 • Date July 1996

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Displaying Results 1 - 25 of 38
  • Motion estimation for moving target detection

    Publication Year: 1996, Page(s):866 - 874
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5061 KB)

    This paper describes a suite of techniques for the autonomous detection of moving targets by processing electro-optical sensor imagery (such as visible or infrared imagery). Specific application scenarios that require moving target detection capability are described, and solutions are developed under the constraints imposed by the scenarios. Performance evaluation results are presented using a tes... View full abstract»

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  • A system for obstacle detection during rotorcraft low altitude flight

    Publication Year: 1996, Page(s):875 - 897
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (8467 KB)

    An airborne vehicle such as a rotorcraft must avoid obstacles like antennas, towers, poles, fences, tree branches, and wires strung across the flight path. Automatic detection of the obstacles and generation of appropriate guidance and control actions for the vehicle to avoid these obstacles would facilitate autonomous navigation. The requirements of an obstacle detection system for rotorcraft in ... View full abstract»

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  • Neural network learning of low-probability events

    Publication Year: 1996, Page(s):898 - 910
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3335 KB)

    In the problem of stationary target identification (STI) via millimeter wave (MMW) seeker radars in heavy clutter environments, it is often necessary to use nonparametric identification procedures, as detailed parametric models of clutter and target returns are generally unavailable. Neural networks provide an attractive approach to perform nonparametric identification. However, when identifying l... View full abstract»

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  • Optimum array detector for a weak signal in unknown noise

    Publication Year: 1996, Page(s):911 - 922
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1733 KB)

    We study the design of constant false-alarm rate (CFAR) tests for detecting a rank-one signal in the presence of background Gaussian noise with unknown spatial covariance. We look at invariant tests, i.e., those tests whose performance is independent of the nuisance parameters, like the background noise covariance. Such tests are shown to have the desirable CFAR property. We characterize the class... View full abstract»

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  • Contiguous pulse binary integration analysis

    Publication Year: 1996, Page(s):923 - 933
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3166 KB)

    The probability of detecting m or more pulses contiguously-that is, in a row-from a pulse train of n pulses is determined when the detection of each pulse is an independent Bernoulli trial with probability p. While a general closed-form expression for this probability is not known, we present an analytical procedure that gives the exact expression for the probability of interest for any particular... View full abstract»

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  • Dynamic response of Granlund predetection diversity combiners

    Publication Year: 1996, Page(s):934 - 944
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2527 KB)

    A new linearized model is developed for the Granlund combiner that is useful in determining the combiner performance with physically realizable filters and with dynamic variations such as rapid fading and burst signals. The model is tailored for use in determining automatic gain control (AGC) stability. The model is also tailored for use in predicting combiner transient phase correction error. View full abstract»

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  • Control for unstable nonminimum phase uncertain dynamic vehicle

    Publication Year: 1996, Page(s):945 - 951
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1429 KB)

    A control algorithm for control of linear uncertain systems is presented. This algorithm is applied to the control of an unstable nonminimum phase uncertain dynamic vehicle. The algorithm is based on the state and parameters observability canonical (SPOC) form and a certainty equivalence pole placement controller. The algorithm provides single controller for the problem of the uncertain dynamic ve... View full abstract»

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  • Adaptive control strategies for flexible space structures

    Publication Year: 1996, Page(s):952 - 966
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2846 KB)

    The problem of controlling flexible space structures in the presence of significant uncertainties using only position measurements is considered. Adaptive controllers, which are capable of controlling partially known dynamical systems and delivering good performance by providing a time-varying compensation on-line, are desirable for such system. We present an adaptive controller which can globally... View full abstract»

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  • The effect of the magnetizing inductance on the small-signal dynamics of the isolated Cuk converter

    Publication Year: 1996, Page(s):967 - 983
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3816 KB)

    The magnetizing inductance of the isolated Cuk converter introduces an undesirable pair of closely spaced complex zeros and poles, or a glitch, in the control-to-output transfer function. Limited analysis and experimentation in the past have shown that sufficient increase in the magnetizing inductance or manipulation of the ratio of the capacitances of the energy transfer capacitors can reduce the... View full abstract»

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  • Overlapping search with scanned beam applications

    Publication Year: 1996, Page(s):984 - 994
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1966 KB)

    Acquisition and false acquisition probabilities are derived for search including overlap between observation regions. (Gap-free search, important in many applications, frequently involves overlap.) Search patterns are included, together with system parameters and observation sequences minimizing search time. Design curves applicable to laser, radar, sonar, and other methods are used in practical e... View full abstract»

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  • Tracking in clutter with nearest neighbor filters: analysis and performance

    Publication Year: 1996, Page(s):995 - 1010
    Cited by:  Papers (62)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1897 KB)

    The measurement that is "closest" to the predicted target measurement is known as the "nearest neighbor" (NN) measurement in tracking. A common method currently in wide use for tracking in clutter is the so-called NN filter, which uses only the NN measurement as if it were the true one. The purpose of this work is two fold. First, the following theoretical results are derived: the a priori probabi... View full abstract»

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  • Intersatellite laser crosslinks

    Publication Year: 1996, Page(s):1011 - 1020
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1697 KB)

    Intersatellite laser crosslinks (ISL) provide a method of communication that has significantly increased the data throughput that can be managed over typical RF communication systems, and has significant growth potential. Optical communications offer very wide bandwidths which can be effectively utilized with wavelength division multiplexing techniques. The data rate growth potential is well beyon... View full abstract»

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  • Track-to-track fusion with dissimilar sensors

    Publication Year: 1996, Page(s):1021 - 1029
    Cited by:  Papers (40)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1285 KB)

    An analysis is described of a kinematic state vector fusion algorithm when tracks are obtained from dissimilar sensors. For the sake of simplicity, it is assumed that two dissimilar sensors are equipped with nonidentical two-dimensional optimal linear Kalman filters. It is shown that the performance of such a track-to-track fusion algorithm can be improved if the cross-correlation matrix between c... View full abstract»

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  • Target motion analysis with multiple arrays: performance analysis

    Publication Year: 1996, Page(s):1030 - 1046
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1829 KB)

    The performance analysis of source trajectory estimation using measurements provided by multiple platforms (or arrays) is studied. In numerous practical situations, the maneuvering ability of the receiver (e.g., a ship towing linear arrays) is limited, leading to the assumption that the observer motion is rectilinear and uniform. Even if this hypothesis appears quite restrictive, practical and tac... View full abstract»

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  • DOA and steering vector estimation using a partially calibrated array

    Publication Year: 1996, Page(s):1047 - 1057
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2486 KB)

    We consider the problem of estimating directions of arrival (DOAs) using an array of sensors, where some of the sensors are perfectly calibrated, while others are uncalibrated. We identify a cost function whose minimizer is a statistically consistent and efficient estimator of the unknown parameters-the DOAs and the gains and phases of the uncalibrated sensors. Next we present an iterative algorit... View full abstract»

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  • Satellite passive intermodulation: systems considerations

    Publication Year: 1996, Page(s):1058 - 1064
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3071 KB)

    Passive intermodulation (PIM) occurring in multicarrier transmission systems can have deleterious effects on system performance by significantly increasing the noise level. An argument is presented for system-level testing for PIM, particularly for high-power communications satellites. In the past, two-carrier, component-level tests were employed to ensure that PIM would not degrade system S/N per... View full abstract»

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  • A fuzzy sliding-mode controller design for a synchronous reluctance motor drive

    Publication Year: 1996, Page(s):1065 - 1076
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4116 KB)

    A new method for controlling a synchronous reluctance drive system using a sliding mode with fuzzy controller design is presented. The fuzzy controller is used to adjust the sliding line of the sliding-mode controller. Using this method, the system has a fast response and a good disturbance rejection capability. In addition, the chattering of the speed is reduced. In this work, the mathematical mo... View full abstract»

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  • An efficient active ripple filter for use in DC-DC conversion

    Publication Year: 1996, Page(s):1077 - 1084
    Cited by:  Papers (28)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1295 KB)

    When low ripple is required from a switched mode dc-dc converter, dissipative active filters offer an alternative to passive LC and coupled inductor filters. Analytical and experimental results are presented for a simple active ripple filter. The filter employs a pair of current transformers as sensors for feedforward and feedback control and two metal-oxide-semiconductor field-effect transistors ... View full abstract»

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  • A bird's eye view on the descent trajectory

    Publication Year: 1996, Page(s):1085 - 1087
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (633 KB)

    The image of a flat patch of ground, as seen by a descending observer, can be made locally stationary by choice of the local descent angle. This defines a descent trajectory which maintains a motion contrast between the image of a three-dimensional target and that of its background. View full abstract»

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  • Space-based SSR constellation for global air traffic control

    Publication Year: 1996, Page(s):1088 - 1106
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6539 KB)

    Advanced surveillance and communications are the main functions needed for an efficient Air Traffic Control/Management (ATC/ATM). In order to perform them over the entire Earth, a novel architecture is described and evaluated. It supplies the surveillance and data link capabilities of advanced Secondary Surveillance Radar (SSR) Mode S world-wide by means of a constellation of medium orbit satellit... View full abstract»

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  • Short-time stability of proportional navigation guidance loop

    Publication Year: 1996, Page(s):1107 - 1115
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2309 KB)

    Stability characteristics of proportional navigation (PN) guidance are analyzed by using the short-time stability criterion which is extended here to accommodate time-varying state weights and time-varying bounds of the state norm. As short-time stability is defined over a specified time interval, its application to the stability analysis of a homing guidance loop that operates up to a finite time... View full abstract»

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  • The GPS equations and the Problem of Apollonius

    Publication Year: 1996, Page(s):1116 - 1124
    Cited by:  Papers (20)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1674 KB)

    By relating the Global Positioning System (GPS) problem of location to the ancient Problem of Apollonius, this work presents a closed solution to the pseudorange positioning problem for two and three dimensions The positioning problem, given by a set of nonlinear equations, has been reduced to the solution of a quadratic equation. The resulting expressions yield either two or one physically meanin... View full abstract»

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  • An MMAE failure detection system for the F-16

    Publication Year: 1996, Page(s):1125 - 1136
    Cited by:  Papers (33)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4811 KB)

    A multiple model adaptive estimation (MMAE) algorithm is implemented with the fully nonlinear six-degree-of-motion, Simulation Rapid-Prototyping facility (SRF) VISTA F-16 software simulation tool. The algorithm is composed of a bank of Kalman filters modeled to match particular hypotheses of the real world. Each presumes a single failure in one of the flight-critical actuators, or sensors, and one... View full abstract»

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  • Comment on "A new approach to robust fault detection and identification"

    Publication Year: 1996, Page(s):1137 - 1138
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (107 KB)

    In the paper by M. Saif and Y. Guan (see ibid., vol. 3, no 29, p. 685-695), a necessary and sufficient condition is given for the existence of an asymptotically stable observer in the case of p=m. The objective of this note is to point out a critical mistake in the main theorem of the paper. View full abstract»

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  • State space modeling of random drift rate in high-precision gyro

    Publication Year: 1996, Page(s):1138 - 1143
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (881 KB)

    A state space approach for the modeling of nonstationary time series is presented. Based on the concept of smoothness priors constraint, the overall model is fitted by using the Kalman filler and Akaike's AIC criterion. Whenever an autoregressive (AR) model with time-varying coefficient is fitted in state space model, it can be used for the time-varying spectrum estimation. Some numerical results ... 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