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Aerospace and Electronic Systems, IEEE Transactions on

Issue 2 • Date April 1996

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Displaying Results 1 - 25 of 36
  • Adaptive detection threshold optimization for tracking in clutter

    Publication Year: 1996 , Page(s): 514 - 523
    Cited by:  Papers (14)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2468 KB)  

    The adaptive optimization of detection thresholds for tracking in clutter is investigated for the probabilistic data association (PDA) filter. Earlier work on this problem by T.E. Fortmann et al. (1985) involved an approximate steady-state analysis of the state error covariance and is only suitable for time-invariant systems. Furthermore, the method requires numerous assumptions and approximations... View full abstract»

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  • Adaptive fusion by reinforcement learning for distributed detection systems

    Publication Year: 1996 , Page(s): 524 - 531
    Cited by:  Papers (28)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2145 KB)  

    Chair and Varshney (1986) have derived an optimal rule for fusing decisions based on the Bayeslan criterion. To implement the rule, the probability of detection P D and the probability of false alarm P F for each detector must be known, but this information is not always available in practice. An adaptive fusion model which estimates the P D and P F adap... View full abstract»

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  • The eigencanceler: adaptive radar by eigenanalysis methods

    Publication Year: 1996 , Page(s): 532 - 542
    Cited by:  Papers (96)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2399 KB)  

    It is shown that the dominant eigenvectors of the space-time correlation matrix contain all the information about the space-time distribution of the interferences. The eigencanceler is a new approach to adaptive radar beamforming in which the weight vector is constrained to be in the noise subspace, the subspace orthogonal to the dominant eigenvectors. Two types of eigencancelers are suggested: th... View full abstract»

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  • Likelihood-ratio detection of frequency-hopped signals

    Publication Year: 1996 , Page(s): 543 - 553
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2981 KB)  

    The optimum system for intercepting frequency-hopped signals uses a channelized receiver and a likelihood-ratio test (LRT). Previous results on the performance of the optimum system have been based on Gaussian assumptions, which are generally valid for transmissions having large time-bandwidth areas. Results, obtained by Monte Carlo simulation, for relatively small time-bandwidth transmissions are... View full abstract»

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  • Censoring sensors: a low-communication-rate scheme for distributed detection

    Publication Year: 1996 , Page(s): 554 - 568
    Cited by:  Papers (193)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3173 KB)  

    We consider a new scheme for distributed detection based on a "censoring" or "send/no-send" idea. The sensors are assumed to "censor" their observations so that each sensor sends to the fusion center only "informative" observations, and leaves those deemed "uninformative" untransmitted. The main result of this work is that with conditionally independent sensor data and under a communication rate c... View full abstract»

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  • Active damping control of vibrational systems

    Publication Year: 1996 , Page(s): 569 - 577
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2227 KB)  

    The problem of vibration suppression in large flexible space structure (LFSS) is investigated. Based on the structure property of LFSS, an active damping strategy is proposed to effectively attenuate the critical vibrations of the structure subject to modeling uncertainty and external disturbance. Control algorithms are derived with the aim of suppressing both the vibrating magnitude and vibrating... View full abstract»

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  • Estimation of Rodrigues parameters from vector observations

    Publication Year: 1996 , Page(s): 578 - 586
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1544 KB)  

    A recursive minimum variance algorithm for attitude determination is presented. The attitude is expressed by the Rodrigues vector, where only three parameters are needed to describe orientation. The advantage of using the Rodrigues parameters is computational. Attitude calculations involve only relatively simple algebraic expressions, which is advantageous especially in real-time applications. The... View full abstract»

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  • Analysis of array errors and a short-time processor in airborne phased array radars

    Publication Year: 1996 , Page(s): 587 - 597
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2430 KB)  

    Array errors are inherent in a realistic phased array radar system. The influence of array errors on the clutter degrees of freedom and the clutter subspace in an airborne phased array radar is analyzed. Based on the presented theoretic results, a method of short-time processing followed by coherent integration is proposed for clutter suppression in airborne phased array radars. It can approximate... View full abstract»

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  • Radar target classification of commercial aircraft

    Publication Year: 1996 , Page(s): 598 - 606
    Cited by:  Papers (69)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1777 KB)  

    With the increased availability of coherent wideband radars there has been a renewed interest in radar target recognition. A large bandwidth gives high resolution in range which means target discrimination may be possible. Coherence makes cross-range resolution and radar images possible. Some of the problems of classifying high resolution range profiles (HRRPs) are examined and simple preprocessin... View full abstract»

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  • Optimal load distribution for tree network processors

    Publication Year: 1996 , Page(s): 607 - 612
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1880 KB)  

    A tree network consisting of communicating processors is considered. The objective is to minimize the processing time by distributing the processing load to other nodes. The effect of the order of load distribution on the processing time is addressed. An algorithm which optimally determines the order of load distribution is developed. It is shown that the order depends only on the channel capacity... View full abstract»

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  • Target detection with synthetic aperture radar

    Publication Year: 1996 , Page(s): 613 - 627
    Cited by:  Papers (12)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2628 KB)  

    Target detection with synthetic aperture radar (SAR) is considered. We derive generalized likelihood ratio (GLR) detection algorithms that may be used with SAR images that are obtained with coherent subtraction or have Gaussian distributions. We analytically compare the performance of (1) a single pixel detector, (2) a detector using complete knowledge of the target signature information and known... View full abstract»

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  • A wavelet multiresolution analysis for spatio-temporal signals

    Publication Year: 1996 , Page(s): 628 - 649
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (13135 KB)  

    The wavelet filters of the conventional 3D multiresolution analysis possess homogeneous spatial and temporal frequency characteristics which limits one's ability to match filter frequency characteristics to signal frequency behavior. Also, the conventional 3D multiresolution analysis employs an oct-tree decomposition structure which restricts the analysis of signal details to identical resolutions... View full abstract»

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  • SNR-based multipath error correction for GPS differential phase

    Publication Year: 1996 , Page(s): 650 - 660
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3956 KB)  

    Carrier phase multipath is currently the limiting error source for high precision Global Positioning System (GPS) applications such as attitude determination and short baseline surveying. Multipath is the corruption of the direct GPS signal by one or more signals reflected from the local surroundings. Multipath reflections affect both the carrier phase measured by the receiver and signal-to-noise ... View full abstract»

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  • Distributed decision fusion in the presence of link failures

    Publication Year: 1996 , Page(s): 661 - 667
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1506 KB)  

    The problem of optimal data fusion involving detector unit communication link failures is considered. Two strategies for decision making in presence of link failures are examined and an optimal decision making scheme in the sense of the Neyman-Pearson (N-P) test is proposed. The performance of q+1 reliable links versus q reliable links are examined theoretically, as well as, numerically using the ... View full abstract»

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  • Range sidelobe reduction for the quadriphase codes

    Publication Year: 1996 , Page(s): 668 - 675
    Cited by:  Papers (3)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1980 KB)  

    Filters that reduce the sidelobes of the quadriphase-coded waveform are realized by applying the biphase-to-quadriphase transformation to the filter designs that reduce the sidelobes of the prototype biphase code. The mismatch loss is invariant under this transformation, but the resulting peak-to-sidelobe ratio (PSR) can decrease 1.5 dB maximum. An example illustrates the procedure for a compresso... View full abstract»

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  • Rank one phase error estimation for range-Doppler imaging

    Publication Year: 1996 , Page(s): 676 - 688
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (6299 KB)  

    A range-Doppler image is corrupted when each pulse in the corresponding range-time array contains a single time-dependent phase error. A previously devised algorithm, the rank one phase estimation (ROPE) technique developed by F. Dyson, et al. (1992), estimates the phase errors, which are then removed so that range-Doppler imaging can proceed in the usual manner. The iterative algorithm works homo... View full abstract»

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  • Eigenstructure-based algorithms for direction finding with time-varying arrays

    Publication Year: 1996 , Page(s): 689 - 701
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2186 KB)  

    This paper considers the problem of finding the directions of narrowband signals using a time-varying array whose elements move during the observation interval in an arbitrary but known way. We derive two eigenstructure-based algorithms for this problem, which are modifications of techniques developed originally for time-invariant arrays. The first uses array interpolation, and the second uses foc... View full abstract»

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  • Small signal analysis of the LCC-type parallel resonant converter

    Publication Year: 1996 , Page(s): 702 - 713
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2405 KB)  

    In this paper, the small signal analysis of the LCC-type parallel resonant converter (LCC-PRC) operating in the continuous conduction mode is given. This analysis is based on both the state-plane diagram, which has been successfully used to obtain the steady state response for resonant converters, and the Taylor series expansion. Applying perturbation directly to the steady state trajectory, a dis... View full abstract»

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  • A new algorithm for the formation of ISAR images

    Publication Year: 1996 , Page(s): 714 - 721
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1984 KB)  

    A new technique for implementing the enhanced image processing (EIP) algorithm for the formation of inverse synthetic aperture radar (ISAR) images is presented. The EIP algorithm is required when, during the formation of an image, scattering centers on a target move out of range and/or Doppler resolution cells. This phenomenon is common for high resolution imagery of practical-sized targets. The m... View full abstract»

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  • Optimal scheduling of parallel tasks of tracking problem onto multiprocessors

    Publication Year: 1996 , Page(s): 722 - 731
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2896 KB)  

    The optimal scheduling of the tasks of a multitarget tracking problem onto multiprocessors to minimize the schedule length is considered. The main impediments of the recent A* algorithm for optimal scheduling of the tasks of this problem, the space and time requirements, are reduced using three new techniques, viz. processor isomorphism, duplicated node deletion, and lower bound on completion time... View full abstract»

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  • Feedback linearization and solar pressure satellite attitude control

    Publication Year: 1996 , Page(s): 732 - 741
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2313 KB)  

    The question of large angle pitch attitude maneuver of satellites using solar radiation pressure is considered. For pitch axis maneuver, two highly reflective control surfaces are used to generate radiation moment. Based on dynamic feedback linearization, a nonlinear control law is derived for large pitch attitude control. In the closed-loop system, the response characteristics of the pitch angle ... View full abstract»

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  • Locally optimal and suboptimal signal detection in transformation noise

    Publication Year: 1996 , Page(s): 742 - 753
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3664 KB)  

    The efficacy of the optimal detector of a known vanishingly small signal in additive nonwhite transformation noise is compared with that of some eleven structurally simpler suboptimal detectors. Simulation is done under various signal choices, marginal densities, and correlation functions. The block g lo and the block combination g followed by R v -1 in the optimal... View full abstract»

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  • Performance analysis of GPS carrier phase observable

    Publication Year: 1996 , Page(s): 754 - 767
    Cited by:  Papers (4)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2784 KB)  

    The accuracy analysis of Global Positioning System (GPS) carrier phase observable measured by a digital GPS receiver is presented. A digital phase-locked loop (DPLL) is modeled to extract the carrier phase of the received signal after a pseudorandom noise (PRN) code synchronization system despreads the received PRN coded signal. Based on phase noise characteristics of the input signal, the followi... View full abstract»

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  • An application of embedology to spatio-temporal pattern recognition

    Publication Year: 1996 , Page(s): 768 - 774
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3406 KB)  

    The theory of embedded time series is shown applicable for determining a reasonable lower bound on the length of test sequence required for accurate classification of moving objects. Sequentially recorded feature vectors of a moving object form a training trajectory in feature space. Each of the sequences of feature vector components is a time series, and under certain conditions, each of these ti... View full abstract»

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  • A coupled finite-element state-space approach for synchronous generators. I. model development

    Publication Year: 1996 , Page(s): 775 - 784
    Cited by:  Papers (22)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2002 KB)  

    Presented here is the development of a time stepping coupled finite-element state-space (CFE-SS) modeling environment, totally within the natural time domain ABC flux-linkage frame of reference, to predict the steady-state machine parameters and performance characteristics, including laminated iron core losses, of salient-pole synchronous machines. The time stepping CFE-SS model allows one to rigo... 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