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IEEE Transactions on Aerospace and Electronic Systems

Issue 6 • Date Nov. 1991

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Displaying Results 1 - 25 of 25
  • Comments on "Mismatched filter design for periodical binary phased signals" by H. Rohling and W. Plagge

    Publication Year: 1991, Page(s):905 - 906
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (175 KB)

    The commenter states that the filters described in the above-mentioned paper by H. Rohling and W. Plagge (see ibid., vol.26, no.6, p.890-6, Nov. 1989) were described in general terms in his articles from 1977-8. The families of binary sequences with minimal or small loss-factors were described by the commenter in earlier publications (1980, 1987). Comparison of the data from these papers and from ... View full abstract»

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  • Comments, with reply, on "A new algorithm to optimize Barker code sidelobe suppression filters" by X.H. Chen and J. Oksman

    Publication Year: 1991, Page(s):921 - 922
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (74 KB)

    In the above-titled paper (see ibid., vol.26, no.4, July 1990), the authors presented a simple approach to suppressing Barker code compression sidelobes. It consists of approximating an inverse filter in a finite series of terms with unknown coefficients. The coefficients are then determined by a simplex solution to an appropriate linear programming problem. The commenter indicates the results are... View full abstract»

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  • Comments, with reply, on "Convergence properties of Gram-Schmidt and SMI adaptive algorithms" by K. Gerlach and F.F. Kretschmer, Jr

    Publication Year: 1991, Page(s):897 - 901
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (485 KB)

    The commenter summarizes Q-R decomposition techniques for solving the least squares (LS) problem and comments on associated aspects of the work presented by K. Gerlach and F.F. Kretschmer, Jr. (ibid., vol.267, no.1, Jan.90). In response to the commenter's statement that the statistical properties of the LS that determine the convergence performance are well known. Gerlach and Kretschmer assert tha... View full abstract»

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  • Comments, with reply, on "Federated square root filter for decentralized parallel processes"

    Publication Year: 1991, Page(s):946 - 951
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (646 KB)

    First Page of the Article
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  • An optimum filter for direct A/D conversion

    Publication Year: 1991, Page(s):883 - 886
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (417 KB)

    The author describes a design procedure to find the optimum finite-impulse-response (FIR) filter coefficients when the characteristics of the bandpass filter preceding the analog-to-digital (A/D) converter are known. A simulation of direct A/D conversion performance shows the improvement over the filter coefficients designed to minimize the maximum error over a specified band of frequencies. DC ca... View full abstract»

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  • Real time estimator for control of an orbiting single tether system

    Publication Year: 1991, Page(s):880 - 883
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (422 KB)

    A real-time estimator is developed for the control of the Tether Dynamics Explorer (TDE) system. TDE is being used in a series of tethered satellite flight experiments whose purpose is to validate existing system models and test proposed control laws. Each experiment consists of an orbiting Delta II second stage which deploys toward the Earth a small box-shaped passive endbody at the end of a flex... View full abstract»

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  • Diversity methods in phase monopulse tracking-a new approach

    Publication Year: 1991, Page(s):877 - 880
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    A novel approach relating target glint (difference between the phase-front gradient of the scattered field and the true target direction vector) to the analytic properties of the overall field is used to suggest a method by which the error in conventional (single frequency) phase monopulse trackers can be reduced. The approximate relationship between glint and amplitude is briefly developed, and a... View full abstract»

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  • Effectiveness of track monitoring with multiple 2D passive sensors

    Publication Year: 1991, Page(s):941 - 945
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (469 KB)

    An analytical technique is presented which can be used to evaluate the effectiveness of the track monitoring scheme presented by J.A. Roecker (see ibid., vol.27, no.6, p.872-6, Nov. 1991) in detecting false track-to-track (ghost track) assignments without the use of simulations. It is shown that when two tracks are traveling in parallel and in the direction of the inclination angle, it is impossib... View full abstract»

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  • Split vector radix algorithm for two-dimensional Hartley transform

    Publication Year: 1991, Page(s):865 - 868
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (365 KB)

    A fast algorithm is presented which computes the two-dimensional Hartley transform. This algorithm is referred to as the split vector radix algorithm. It uses the decimation in frequency decomposition and, due to its in-place property, it does not require midmemory devices or matrix transposition. Its computational structure is simpler than that of the algorithm of L.Z. Chen (1983), and it is easy... View full abstract»

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  • On the accuracy of approximations in the error analysis of registration systems

    Publication Year: 1991, Page(s):922 - 924
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (342 KB)

    The similarity functions used to register images are often approximated for the purposes of statistical analysis. An extension of a theorem for one-dimensional signals is presented that can assess the effects of approximations used in the statistical analysis of a registration system. The extended theorem facilitates the selection of an approximation that is sure to yield a pessimistic, or, if so ... View full abstract»

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  • Computation of binary integration detection probabilities

    Publication Year: 1991, Page(s):894 - 897
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (391 KB)

    Efficient algorithms are described for computing the probability of detection for a binary integration when the probability of a threshold crossing changes from sample to sample. A binary integrator is exceeded (a hit occurs) in a sequence of N trials and declares a detection if the number of hits is at least as large as some number M, where O View full abstract»

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  • Track monitoring when tracking with multiple 2D passive sensors

    Publication Year: 1991, Page(s):872 - 876
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (529 KB)

    A fast method of track monitoring is presented which determines what tracks are good and what tracks have had data association problems and should be eliminated. The philosophy of tracking in a dense target environment with limited central processing unit (CPU) time is to acquire the targets, track them with as simple a filter as will meet requirements, and monitor the tracks to determine if they ... View full abstract»

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  • Decentralized linear estimation in correlated measurement noise

    Publication Year: 1991, Page(s):939 - 941
    Cited by:  Papers (46)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (345 KB)

    Some results and perspectives are provided on the problem of optimally combining estimates from different sensors when the measurement noise processes are correlated. The authors consider only the static estimation problem and limit the discussion to fusion with two sensors. A necessary and sufficient condition for optimality of the decentralized estimator in the presence of correlated measurement... View full abstract»

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  • Estimation of 3D angular motion using gyroscopes and linear accelerometers

    Publication Year: 1991, Page(s):910 - 920
    Cited by:  Papers (7)  |  Patents (53)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    The authors present a novel, real-time angular motion estimation technique using a linear Gaussian estimator, and the outputs of linear accelerometers and gyroscopes, to assess the actual angular velocity of a rigid body in three-dimensional (3D) space. The method obtains the covariances of the random actual 3D angular velocity, the angular velocity measurement, and the measurement noise from the ... View full abstract»

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

    Publication Year: 1991, Page(s):886 - 890
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (502 KB)

    A recommended form of the signal-to-noise equation that includes both internal and external system noise and signal/noise processing losses is discussed. The recommended form conforms to the internationally accepted definition of system operating noise factor but is extended to include signal/noise processing. The predetection signal-to-noise ratio (SNR) of a radar or communication system is propo... View full abstract»

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  • Existence and uniqueness of GPS solutions

    Publication Year: 1991, Page(s):952 - 956
    Cited by:  Papers (40)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (533 KB)

    The existence and uniqueness of positions computed from global positioning system (GPS) pseudorange measurements is studied. Contrary to the claims of S. Bancroft (1985) and L.O. Krause (1987), in the case of n=4 satellites a fix may not exist, and, if a fix exists, it is not guaranteed to be unique. In the case of n>or=5 satellites, a unique fix is assured, except in certain degenerate cases such... View full abstract»

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  • Antenna array beam steering using time-varying weights

    Publication Year: 1991, Page(s):861 - 865
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (434 KB)

    The author presents a new technique of steering an array antenna by introducing time-varying phase weights. It is shown that the technique is equivalent to placing a linear phase and linear frequency offset across the array when transmitting a linear frequency modulated (LFM) waveform. The technique reduces array dispersion and increases the operating bandwidth. An element level signal generator i... View full abstract»

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  • Radar measurement accuracy for fluctuating targets

    Publication Year: 1991, Page(s):868 - 870
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (366 KB)

    The impact of target radar cross-section (RCS) fluctuations on the thermal noise limited accuracy of radar measurements of range, range rate, and angle are evaluated for the Swerling fluctuation models. For large signal-to-noise ratios (SNRs), the accuracy criterion used is the measurement error with the same probability span as the one corresponding to the standard deviation points of the measure... View full abstract»

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  • Simulation of power electronic circuits containing nonlinear inductances

    Publication Year: 1991, Page(s):924 - 931
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (607 KB)

    Power electronic circuits which contain nonlinear inductances are described by a set of nonlinear state equations. The author presents a sampled-data model for the circuit from which a set of linear state equations can be formulated. In the sampled-data model, the nonlinear inductor is modeled by an ideal sampler, a variable gain, and a clamp. The state variables for the circuit are updated during... View full abstract»

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  • A self-normalizing gradient search adaptive array algorithm

    Publication Year: 1991, Page(s):901 - 905
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (483 KB)

    A method is described to normalize the step parameter and perturbation amount used for gradient search adaptive algorithms. The step normalization assures rapid stable convergence. The perturbation normalization also assures rapid stable convergence and limits the output perturbation noise to a level below thermal noise. The normalizations are computationally simple and are consistent with the use... View full abstract»

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  • On analytical evaluation of glint error reduction for frequency-hopping radars

    Publication Year: 1991, Page(s):891 - 894
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (401 KB)

    Analytical techniques are presented for evaluating the glint error reduction of frequency-agile tracking radars employing discrete frequency-hopping (FH). The techniques can be used to compare the tracking accuracies obtained with different procedures for frequency selection. The cases of random, cyclic, and hybrid FH are worked out in detail. An illustration using a simple alpha-beta tracking fil... View full abstract»

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  • Development of airborne moving target radar for long range surveillance

    Publication Year: 1991, Page(s):959 - 972
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1540 KB)

    The following topics are discussed in the context of the development of an airborne moving target radar for long range surveillance: US Navy long range shipborne radar; Cadillac I airborne early warning (AEW) radar; Cadillac II airborne early warning (AEW) radar; airborne moving target indicating (AMTI) radar; related post-war radar activities; and the invention of the displaced center antenna. Am... View full abstract»

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  • Discrete optimal guidance for high-order missile and maneuvering target

    Publication Year: 1991, Page(s):870 - 872
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    An explicit closed-form formula of a discrete guidance law for a linear time-invariant, acceleration commanded, arbitrary-order missile and a linear, time-invariant arbitrary-order, maneuvering target is derived. The formula is given in terms of the missile and target transfer functions and responses to initial conditions. Examples are explicitly solved for zero-lag and a first-order missile. As a... View full abstract»

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  • Variability of GPS satellite differential group delay biases

    Publication Year: 1991, Page(s):931 - 938
    Cited by:  Papers (71)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (803 KB)

    An important issue in determining the accuracy of global positioning system (GPS) satellite ionospheric measurements is the instrumental delay biases between the L-band frequencies in both the satellites and the receivers. These differential L1-L2 biases must be measured and removed from the GPS measurements before an accurate estimate of the total electron content can be obtained. The results fro... View full abstract»

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  • Computation of the circular error probability integral

    Publication Year: 1991, Page(s):906 - 910
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (443 KB)

    The author describes a simplified derivation of the representation of the circular error probability (CEP) integral, which is the integral over a disk centered at the origin of a zero mean two-dimensional Gaussian random variable, as a one-dimensional integral. In addition, two series are presented which can be used to compute efficiently the CEP integral. The domain of applicability of the series... 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
Lance Kaplan
Army Research Laboratory