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IEEE Transactions on Aerospace and Electronic Systems

Issue 2 • Apr 2000

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Displaying Results 1 - 25 of 34
  • Parametric adaptive matched filter for airborne radar applications

    Publication Year: 2000, Page(s):677 - 692
    Cited by:  Papers (109)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1456 KB)

    The parametric adaptive matched filter (PAMF) for space-time adaptive processing (STAP) is introduced via the matched filter (MF), multichannel linear prediction, and the multichannel LDU decomposition. Two alternative algorithmic implementations of the PAMF are discussed. Issues considered include sample training data size and constant false alarm rate (CFAR). Detection test statistics are estima... View full abstract»

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  • Automatic target recognition using sequences of high resolution radar range-profiles

    Publication Year: 2000, Page(s):364 - 381
    Cited by:  Papers (56)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1696 KB)

    In this paper, we address the problem of joint tracking and recognition of a target using a sequence of high resolution radar (HRR) range-profiles. The likelihood function for the scene configuration combines a dynamics-based prior on the sequence of target orientations with a likelihood for range-profiles given the target orientation. A deterministic model and a conditionally Gaussian model for r... View full abstract»

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  • Auto-calibrating adaptive array for mobile telecommunications

    Publication Year: 2000, Page(s):729 - 736
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    A major concern for adaptive antennas is the calibration of hardware. Here we consider the calibration of an analog beamformer (ABF), which calculates the weights in a digital signal processor (DSP), but weights the RF signals using a hardware beamformer. Two novel methods are presented of performing a calibration of this adaptive antenna during normal operation. This will mitigate temperature dri... View full abstract»

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  • Direction of arrival tracking below the ambiguity threshold

    Publication Year: 2000, Page(s):354 - 363
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    We present an algorithm for direction-of-arrival (DOA) tracking that allows operation below the ambiguity threshold of the direction-finding (DF) system. Using multiple target tracking techniques, the algorithm turns the most likely DOAs of each measurement into multiple potential tracks and then selects the true track as that with the maximum cumulative likelihood. The improvement offered by the ... View full abstract»

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  • Passive localization of moving emitters using out-of-plane multipath

    Publication Year: 2000, Page(s):584 - 595
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1092 KB)

    The purpose of this work is to establish how a moving emitter, such as a jammer, can be localized by a passive receiver through the use of out-of-plane multipath signals reflected by the terrain. This is a novel localization technique that assumes no a priori knowledge of the localization of the multipath sources. The emitter parameters of range, heading, velocity, and altitude are estimated by ex... View full abstract»

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  • Reduced-rank STAP performance analysis

    Publication Year: 2000, Page(s):664 - 676
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1100 KB)

    The space-time radar problem is well suited to the application of techniques that take advantage of the low-rank property of the space-time covariance matrix. It is shown that reduced-rank (RR) methods outperform full-rank space-time adaptive processing (STAP) when the space-time covariance matrix is estimated from a data set with limited support. The utility of RR methods is demonstrated by theor... View full abstract»

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  • Modified receding horizon guidance law with information on small accurate time-to-go

    Publication Year: 2000, Page(s):725 - 729
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    A modified receding horizon guidance law (MRHG), which is useful when the accurate time-to-go is available only for a short time before the final time, is proposed. The proposed MRHG is based on the receding horizon strategy and optimal control theory. In the presence of arbitrary target maneuvers and an initial lateral miss distance (MD) rate between a target and a missile, it is shown that the p... View full abstract»

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  • Small target detection in clutter using recursive nonlinear prediction

    Publication Year: 2000, Page(s):713 - 718
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    Detecting small objects in clutter is usually carried out by using a predictor to suppress the background clutter. The idea is that a predictor which is trained using clutter data usually has small prediction error for the clutter process, but the prediction error will be relatively large if the signal fed into the predictor contains a target. While conventional approaches use a one-step-ahead pre... View full abstract»

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  • Circular array STAP

    Publication Year: 2000, Page(s):510 - 517
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    Traditionally, space-time adaptive processing (STAP) for airborne early warning (AEW) radar has been applied to uniform linear arrays (ULAs). However, when considering the overall radar system, electronically scanned circular arrays have advantages: a better combination of even and continual angular and temporal coverage, and mechanical simplicity because it does not need to rotate. This paper ans... View full abstract»

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  • Improved algorithm for estimating pulse repetition intervals

    Publication Year: 2000, Page(s):407 - 421
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (944 KB)

    This paper presents an improved algorithm for estimating pulse repetition intervals (PRIs) of an interleaved pulse train which consists of several independent radar signals with different PRIs. The original version of this algorithm is a complex-valued autocorrelation-like integral, which leads to a kind of PRI spectrum wherein the locations of the spectral peaks indicate the PRI values. The origi... View full abstract»

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  • Optimal and adaptive reduced-rank STAP

    Publication Year: 2000, Page(s):647 - 663
    Cited by:  Papers (108)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1612 KB)

    This paper is concerned with issues and techniques associated with the development of both optimal and adaptive (data dependent) reduced-rank signal processing architectures. Adaptive algorithms for 1D beamforming, 2D space-time adaptive processing (STAP), and 3D STAP for joint hot and cold clutter mitigation are surveyed. The following concepts are then introduced for the first time (other than w... View full abstract»

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  • Distribution of the sum of clutter and thermal noise

    Publication Year: 2000, Page(s):709 - 713
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    The results of an approximate method for calculating the probability density function of the amplitude of the sum of Weibull-distributed radar clutter and thermal noise are compared with the exact distributions and found to be inaccurate except in one special case. It is shown how the assumption that the in-phase (I) and quadrature (Q) components of clutter have a joint circular-symmetric density ... View full abstract»

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  • Optimal guidance laws with uncertain time-of-flight

    Publication Year: 2000, Page(s):721 - 725
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The existing optimal guidance laws assume that the time-to-go is known exactly. The time-to-go is usually estimated and thus is a random variable. The issue of optimal guidance with uncertain time-to-go is dealt with here. A problem of the control of linear discrete systems with unknown time-to-go is formulated and solved. The solution is applied to derive guidance laws. The solution depends on th... View full abstract»

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  • Design, implementation and evaluation of parallel pipelined STAP on parallel computers

    Publication Year: 2000, Page(s):528 - 548
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1904 KB)

    Performance results are presented for the design and implementation of parallel pipelined space-time adaptive processing (STAP) algorithms on parallel computers. In particular, the issues involved in parallelization, our approach to parallelization, and performance results on an Intel Paragon are described. The process of developing software for such an application on parallel computers when laten... View full abstract»

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  • Adaptive control for feedback-linearized missiles with uncertainties

    Publication Year: 2000, Page(s):467 - 481
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1004 KB)

    A robust adaptive control scheme is proposed that can be applied to a practical autopilot design for feedback-linearized skid-to-turn (STT) missiles with aerodynamic uncertainties. The approach is to add a robust adaptive controller to a feedback-linearizing controller in order to reduce the influence of the aerodynamic uncertainties. The proposed robust adaptive control scheme is based on a slidi... View full abstract»

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  • Space-time adaptive processing and adaptive arrays: special collection of papers

    Publication Year: 2000, Page(s):508 - 509
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    Space-time adaptive processing (STAP) and related adaptive array techniques hold tremendous potential for improving sensor performance by exploiting signal diversity. Such methods have important application in radar, sonar, and communication systems. Recent advances in digital signal processing technology now provide the computational means to field STAP-based systems. The objective of this specia... View full abstract»

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  • Multiple-model estimation with variable structure. V. Likely-model set algorithm

    Publication Year: 2000, Page(s):448 - 466
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1484 KB)

    For pt. IV see ibid., vol. 35, no. 1, p. 242-254 (1999). A multiple-model (MM) estimator with a variable structure, called likely-model set (LMS) algorithm, is presented, which is generally applicable to most hybrid estimation problems and is easily implementable. It uses a set of models that are not unlikely to match the system mode in effect at any given time. Different versions of the algorithm... View full abstract»

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  • Space-time adaptive radar performance in heterogeneous clutter

    Publication Year: 2000, Page(s):621 - 633
    Cited by:  Papers (158)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1124 KB)

    Traditional analysis of space-time adaptive radar generally assumes the ideal condition of statistically independent and identically distributed (IID) secondary data. To the contrary, measured data suggests realistic clutter environments appear heterogeneous and so the secondary data is no longer IID. Heterogeneity leads to mismatch between actual and estimated covariance matrices, thereby magnify... View full abstract»

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  • Multibody dynamics and robust control of flexible spacecraft

    Publication Year: 2000, Page(s):491 - 500
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (740 KB)

    The paper focuses on an approach to the study of the dynamics and control of large flexible space structures, comprised of subassemblies, a subject of considerable contemporary interest. To begin with, a relatively general Lagrangian formulation of the problem is presented. The governing equations are nonlinear, nonautonomous, coupled, and extremely lengthy even in matrix notation. Next, an effici... View full abstract»

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  • Adaptive processing technique for enhanced CFAR detecting performance in active sonar systems

    Publication Year: 2000, Page(s):693 - 700
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (700 KB)

    Active sonar systems are faced with the difficult task of detecting moving targets in strong reverberation environments. Since the effective whitening of the reverberation cannot be accomplished with a fixed notch filter, a filter structure to recover target signals obscured by the reverberation is proposed. The proposed scheme consists of an adaptive filter and a fixed filter. The optimum and sub... View full abstract»

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  • Identification of nonlinear flight dynamics: theory and practice

    Publication Year: 2000, Page(s):383 - 392
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (772 KB)

    This article presents an innovative time-domain nonlinear mapping-based identification method. The method reported is applied to identify the unknown parameters of multivariable dynamic systems which are mapped by nonlinear differential equations. A systematic identification method is introduced, and a novel algorithm is developed using nonlinear error maps. An analysis of parameter convergence is... View full abstract»

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  • Wideband cancellation of interference in a GPS receive array

    Publication Year: 2000, Page(s):549 - 564
    Cited by:  Papers (118)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1240 KB)

    We have demonstrated that by using an adaptive space-time array the interference from multiple, strong interferers plus multipath can be canceled down close to the noise floor without producing serious loss or distortion of a GPS signal. Design criteria are presented and limitations are examined. We also compare space-time processing with suboptimum space-frequency processing, and demonstrate by s... View full abstract»

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  • Generalized approach for μ synthesis of robust switching regulators

    Publication Year: 2000, Page(s):422 - 431
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    A general method using μ synthesis to design controllers applicable to pulsewidth modulated (PWM) converters is described. System uncertainties from component tolerances are included in the synthesis procedure, adding a quantifiable measure of robustness. Furthermore, these uncertainties have been implemented in a structured format which maximizes available system performance. A boost converter... View full abstract»

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  • Steady-state tracking with LFM waveforms

    Publication Year: 2000, Page(s):701 - 709
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    The steady-state gains and error covariance are derived for a two-state Kalman filter (i.e., an α, β filter) for tracking with linear frequency modulated (LFM) waveforms. A procedure is given for calculating the α, β gains from the tracking index Γ, the sample period T, and the range-Doppler coupling coefficient Δt. The steady-state error covariance is found to be... View full abstract»

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  • Clutter and jammer multipath cancellation in airborne adaptive radar

    Publication Year: 2000, Page(s):565 - 583
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1656 KB)

    Airborne surveillance radars must detect and localize targets in diverse interference environments consisting of ground clutter, conventional jamming, and terrain scattered jammer multipath. Multidimensional adaptive filtering techniques have been proposed to adaptively cancel this interference. However, a detailed analysis that includes the effects of multipath nonstationarity has been elusive. T... 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