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IEEE Transactions on Aerospace and Electronic Systems

Issue 1 • Date Jan 2004

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Displaying Results 1 - 25 of 38
  • Novel AC line conditioner for power factor correction

    Publication Year: 2004, Page(s):168 - 179
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1070 KB) | HTML iconHTML

    A new ac line conditioner is presented for high input power factor and clean ac output voltages for isolating the linear or nonlinear loads. A three-phase two-leg switching mode rectifier with neutral-point-clamped topology is proposed to draw the sinusoidal line currents from the ac mains. The carrier-based current controller is used in the inner control loop to track the line current commands wi... View full abstract»

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  • Robust neuro-H controller design for aircraft auto-landing

    Publication Year: 2004, Page(s):158 - 167
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1062 KB) | HTML iconHTML

    A robust neuro-control scheme is presented for aircraft auto-landing under severe wind conditions and partial loss of control surfaces. In the scheme, a dynamic radial basis function network (RBFN) called minimal resource allocating network (MRAN), that incorporates a growing and pruning strategy, is utilize to aid an H controller using a feedback-error-learning mechanism. The ne... View full abstract»

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  • Data association for deghosting in Y-shaped passive linear array sonars

    Publication Year: 2004, Page(s):103 - 113
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1026 KB) | HTML iconHTML

    This paper deals with data association using three sets of passive linear array sonars (PLAS) geometrically positioned in a Y-shaped configuration, fixed in an underwater environment. The data association problem is directly transformed into a 3D assignment, which is known to be NP hard. For generic passive sensors, it can be solved using conventional algorithms, while in PLAS, it becomes a formid... View full abstract»

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  • Linear time-varying eigenstructure assignment with flight control application

    Publication Year: 2004, Page(s):145 - 157
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (589 KB) | HTML iconHTML

    This work is concerned with the assignment of a desired PD-eigenstructure for linear time-varying systems. Despite its well-known limitations, gain scheduling control appeared to be a focus of the research efforts. Scheduling of frozen-time, frozen-state controllers for fast time-varying dynamics is known to be mathematically fallacious, and practically hazardous. Therefore, recent research effort... View full abstract»

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  • Dynamics and radar cross section density of chaff clouds

    Publication Year: 2004, Page(s):93 - 102
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (734 KB) | HTML iconHTML

    A new chaff cloud model (CCM) is described which is based on fundamental principles with modifications based on laboratory observations. Excellent approximations to the exact physical model have been developed which can rapidly predict the chaff fiber density and orientation as a function of location, time and fiber characteristics. Using this information, the time varying radar cross section (RCS... View full abstract»

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  • Wideband channel model for aeronautical telemetry

    Publication Year: 2004, Page(s):57 - 69
    Cited by:  Papers (31)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1885 KB) | HTML iconHTML

    A multipath channel model for wideband aeronautical telemetry links is presented. Channel sounding data were collected at Edwards AFB, CA, at both L-band and lower S-band. Frequency domain analysis techniques were used to evaluate candidate channel models. The channel model is composed of three propagation paths: a line-of-sight direct path and two specular reflections. The first specular reflecti... View full abstract»

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  • Airborne high-resolution ISAR imaging of ship targets at sea

    Publication Year: 2004, Page(s):378 - 384
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (506 KB) | HTML iconHTML

    We address the problem of airborne high resolution two-dimensional inverse synthetic aperture radar (ISAR) side-view imaging of ship targets. Using a simple model of the ship motions avoids the use of advanced joint-time frequency (JTF) transforms. A robust processing scheme including motion estimation and correction, optimal processing time and duration estimation and target shape extraction are ... View full abstract»

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  • Blind source separation and beamforming: algebraic technique analysis

    Publication Year: 2004, Page(s):221 - 235
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (926 KB) | HTML iconHTML

    Blind source separation (BSS) and blind beamforming schemes attempt to separate additive source signals, collected at a sensor array, and their direction-of-arrival (DOA). To this extent, many different and powerful algorithms have been produced to accomplish these tasks. However, unlike an optimal or adaptive method, an algebraic method for BSS and blind beamforming has the relative advantage of ... View full abstract»

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  • STAP for GPS receiver synchronization

    Publication Year: 2004, Page(s):132 - 144
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1119 KB) | HTML iconHTML

    A space-time adaptive processing (STAP) algorithm for delay tracking and acquisition of the GPS signature sequence with interference rejection capability is developed. The interference can consist of both broadband and narrowband jammers, and is mitigated in two steps. The narrowband jammers are modelled as vector autoregressive (VAR) processes and rejected by temporal whitening. The spatial ing i... View full abstract»

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  • Subspace array processing for the suppression of FM jamming in GPS receivers

    Publication Year: 2004, Page(s):80 - 92
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (982 KB) | HTML iconHTML

    The mitigation of FM interference in GPS receivers is considered. In difference to commonly assumed wideband and narrowband interferers, the FM interferers are wideband, but instantaneously narrowband, and as such, have clear time-frequency (TF) signatures that are distinct from the GPS coarse acquisition (C/A) spread spectrum code. In the proposed technique, the estimate of the FM interference in... View full abstract»

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  • OTHR multipath tracking with uncertain coordinate registration

    Publication Year: 2004, Page(s):38 - 56
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (707 KB) | HTML iconHTML

    Multipath probabilistic data association (MPDA) exploits discrete multipath propagation to improve tracking performance for systems such as over-the-horizon radar (OTHR). The original formulation assumed a known ionospheric environment for mapping radar measurements to ground coordinates. We consider an extension of the technique that allows for ionospheric uncertainties affecting the transformati... View full abstract»

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  • Ultra high resolution spaceborne SAR processing

    Publication Year: 2004, Page(s):370 - 378
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1108 KB) | HTML iconHTML

    The accuracy requirements of the azimuth signal for spaceborne synthetic aperture radar (SAR) processing is analysed. Degradations of simulated extended scenes and point targets are studied at high squint or if erroneous Doppler parameters are used. At a resolution less than 1 m for X-band it is shown that the azimuth signal for spaceborne SAR geometry should be used. It is found that the fourth-o... View full abstract»

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  • Design and implementation of near-field, wideband synthetic aperture beamformers

    Publication Year: 2004, Page(s):206 - 220
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2350 KB) | HTML iconHTML

    A coarray-based near-field, wideband synthetic aperture beamformer using stepped-frequency signal synthesis and post-data acquisition processing is presented. While coarray techniques offer significant reduction in the number of array elements for a given angular resolution, the hybrid subarray-stepped frequency realization of wideband systems simplifies implementations and offers flexibility in b... View full abstract»

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  • GPS navigation with increased immunity to modeling errors

    Publication Year: 2004, Page(s):2 - 11
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (849 KB) | HTML iconHTML

    A robust extended Kalman filter (EKF) is presented for GPS navigation with outlying errors in the GPS measurements due to failed satellites or unmodeled errors. In this approach, the innovation step of the conventional EKF is modified using the robust statistics concept to obtain a more accurate state estimate in the presence of outlying errors. Performance of the proposed robust EKF in comparison... View full abstract»

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  • PIV application in advanced low Reynolds number facility

    Publication Year: 2004, Page(s):310 - 319
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5285 KB) | HTML iconHTML

    The advent of micro aerial vehicles (MAV) and advanced flow control methods, using microelectromechanical systems (MEMS) and micro-blowing or suction, has significantly increased the need for a better understanding of very low Reynolds number flows. Aerodynamic testing in this flow regime using conventional facilities, such as wind or water tunnels, is seriously hampered by the necessary small mod... View full abstract»

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  • Design of frequency modulated waveforms via the Zak transform

    Publication Year: 2004, Page(s):355 - 359
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (571 KB) | HTML iconHTML

    This paper introduces a new technique for designing frequency modulated waveforms that have ambiguity functions with desirable properties, such as strong peaking at the origin and low sidelobes. The methods employed involve signal design in the Zak transform space, as well as the use of stationary phase arguments in the analysis of ambiguity functions. View full abstract»

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  • Nonlinear filtering and time varying Schrodinger equation

    Publication Year: 2004, Page(s):284 - 292
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB) | HTML iconHTML

    Based on our previous work we have successfully reduced the nonlinear filtering problem for Yau filtering system to the time-varying Schrodinger equation. In order to solve the nonlinear filtering problem, one needs to solve the time-varying Schrodinger equation with an arbitrary initial condition. We then solve the time-varying Schrodinger equation by constructing the fundamental solution explici... View full abstract»

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  • From the editors

    Publication Year: 2004, Page(s): 1
    Request permission for commercial reuse | PDF file iconPDF (185 KB) | HTML iconHTML
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  • Implementation of a three-phase high-power-factor rectifier with NPC topology

    Publication Year: 2004, Page(s):180 - 189
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (953 KB) | HTML iconHTML

    A three-phase four-wire power factor corrector based on neutral-point-clamped (NPC) topology is adopted to reduce the current harmonics and increase the input power factor. Using the NPC topology, the voltage stress of power switches can be reduced to the half of the dc-link voltage. With the dc-link voltage controller and the phase locked loop circuit, the balanced and sinusoidal line currents ca... View full abstract»

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  • Polarization diversity detection in compound-Gaussian clutter

    Publication Year: 2004, Page(s):114 - 131
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (852 KB) | HTML iconHTML

    We present the problem of polarization diversity detection in compound-Gaussian clutter with unknown covariance matrix. To this end we assume that a set of secondary data, free of signal components and with the same covariance structure of the cell under test, is available. Due to the lack of a uniformly most powerful (UMP) detector we resort to a design procedure based upon the Rao and the Wald t... View full abstract»

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  • Development of three-phase switch-mode rectifier using single-phase modules

    Publication Year: 2004, Page(s):70 - 79
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (757 KB) | HTML iconHTML

    This paper presents a three-phase (3φ) switch-mode rectifier (SMR) consisting of three 1 φ SMRs, two center-tapped autotransformers and three changeover switches. The ac input sides of three modules are Δ-connected, and their dc output sides are connected in parallel. As any one module fault occurs, the remaining two modules becomes modified T-connected and continuously perform three... View full abstract»

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  • Intrinsic evolution of safe control strategies for autonomous spacecraft

    Publication Year: 2004, Page(s):236 - 246
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB) | HTML iconHTML

    Autonomous space vehicles need adaptive control strategies that can accommodate unanticipated environmental conditions. Although it is not difficult to construct alternative control strategies, a proper evaluation frequently can only be done by actually trying them out in the real physical environment. It therefore becomes imperative that any candidate control strategy be deemed safe - i.e., it do... View full abstract»

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  • Performance evaluation of digital beamforming strategies for satellite communications

    Publication Year: 2004, Page(s):12 - 26
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3821 KB) | HTML iconHTML

    Smart antennas are becoming one of the promising technologies to meet the rapidly increasing demands for more capacity of satellite communication systems. A main component in a smart antenna system is beamforming. Because of the limitations of analog beamforming, digital beamforming will be employed in future satellite communication systems. We evaluate the performance of various digital beamformi... View full abstract»

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  • Maneuver detection using the radar range rate measurement

    Publication Year: 2004, Page(s):330 - 336
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (319 KB) | HTML iconHTML

    Tracking maneuvering targets with radar is complicated because radar cannot directly measure target accelerations. We use the range rate measurement to calculate a new statistic that is a surrogate measurement of target acceleration under a constant rate turn model. Its distribution is found via simulation. A threshold test of the statistic turns out to be a reliable detector of a maneuver. A trac... View full abstract»

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  • An optimization technique for sum and difference array factors [radar array signal processing]

    Publication Year: 2004, Page(s):360 - 370
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB) | HTML iconHTML

    Modern high-resolution radars often employ planar phased array antennas. The patterns for these arrays are usually designed to have narrow mainbeams and low sidelobes. This is best achieved by minimizing the total sidelobe energy in the array factor, rather than setting a sidelobe threshold level as is usually done. A method to achieve the minimizing patterns is described here for both sum and dif... 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