By Topic

IEEE Transactions on Aerospace and Electronic Systems

Issue 4 • Date Jul 1991

Filter Results

Displaying Results 1 - 18 of 18
  • Linear FM signal parameter estimation from discrete-time observations

    Publication Year: 1991, Page(s):607 - 616
    Cited by:  Papers (123)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    The authors consider the problem of estimating the parameters of a complex linear FM signal from a finite number of noisy discrete-time observations. An estimation algorithm is proposed, and its asymptotic (large sample) performance is analyzed. The algorithm is computationally simple, consisting of two fast Fourier transforms (FFTs) accompanied by one-dimensional searches for maxima. The variance... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Harmonic analysis of a parallel-loaded resonant converter

    Publication Year: 1991, Page(s):683 - 688
    Cited by:  Papers (2)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A method for calculating the harmonic components of the currents and voltages in a parallel-loaded resonant converter using frequency-domain techniques is presented. The converter is divided into an inverter section and a rectifier section. A harmonic model is developed for the resonant converter in which the rectifier section is treated as a voltage-dependent current sink. All voltages and curren... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optimum multisensor fusion of correlated local decisions

    Publication Year: 1991, Page(s):593 - 606
    Cited by:  Papers (80)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    A distributed detection system consisting of a number of local detectors and a fusion center is considered. Each detector makes a decision for the underlying binary hypothesis testing problem based on its own observation and transmits its decision to the fusion center where the global decision is derived. The local decision rules are assumed to be given, but the local decisions are correlated. The... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Improved tracking with mode-S data-linked velocity measurements

    Publication Year: 1991, Page(s):709 - 714
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    The use of downlinked airspeed and magnetic heading data to enhance tracking in mode-S equipped air traffic control (ATC) systems is examined. A tracker performing satisfactorily during straight line flight as well as during steep maneuvers is discussed. The filter copes easily with longitudinally accelerating targets and is suitable for tracking low-velocity targets like helicopters in all phases... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Comparison of motion and stereo methods in passive ranging systems

    Publication Year: 1991, Page(s):741 - 746
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The authors compare the estimates in passive ranging systems using motion and stereo approaches. It is shown that an integrated approach is necessary to provide better range estimates over a field-of-view (FOV) of interest in helicopter flight. The recursive approach for processing a sequence of stereo images, described together with a recursive motion algorithm (RMA), provides the basis for an in... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • False alarm effects on estimation in multitarget trackers

    Publication Year: 1991, Page(s):675 - 682
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    An analysis of false alarm effects on tracking filter performance in multitarget track-while-scan radars, using variable correlation gates, is presented. The false alarms considered originate from noise, clutter, and crossing targets. The dimensions of the correlation gates are determined by filter prediction and measurement error variances. Track association is implanted either by means of a dist... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Tracking of crossing targets with imaging sensors

    Publication Year: 1991, Page(s):582 - 592
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB)

    The authors present an algorithm for the tracking of crossing targets using the centroid measurement and the centroid offset measurement of the distributed image formed by the targets. The measurements are obtained by a forward-looking infrared (FLIR) imaging sensor. The joint probabilistic data association merged-measurement coupled filter (JPDAMCF) is used for state estimation which performs fil... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Three-dimensional tracking using on-board measurements

    Publication Year: 1991, Page(s):617 - 624
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    The development of a three-dimensional tracker using onboard measurements is described. A system model based on aircraft dynamics is derived. A full 3-D tracking system that can be split, with a part operating onboard and a part operating on the ground, is developed. Attitude angle and aircraft airspeed measurements are processed to estimate the components of the aircraft velocity with respect to ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On state estimation for an orbiting single tether system

    Publication Year: 1991, Page(s):689 - 695
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    The effects of instrumentation accuracy and configuration on estimation error are studied for the small expandable-tether deployment system (SEDS) using a continuous-discrete extended Kalman filter (CDEKF) state estimator. A twelfth order model that incorporates the rigid body modes of the tether as well as the satellite attitude dynamics is developed. Simulation results using the model and the es... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Adaptive distributed filtering in multicoordinated systems

    Publication Year: 1991, Page(s):715 - 724
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The direct estimation of optimal steady-state gain in the single filtering process introduced by B. Carew et al. (1973) is extended to multicoordinated systems, and the distributed optimal steady-state gains are directly estimated for adaptive distributed filtering. The correlation method using distributed innovation processes is used. The algorithm assumes little prior information about the unkno... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Some properties of retrodirective beam of multiple sidelobe canceler

    Publication Year: 1991, Page(s):625 - 633
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    The retrodirective or perturbation beam concept is often used to aid in explaining the nulling of interference sources. The classical explanation for cancellation of a single-zero-bandwidth source is that of a perturbation beam steered to and peaking at that interferer angle. The subtraction of this perturbation beam from the main beam causes the nulling. It is shown that, for discrete point main ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Using GPS to calibrate Loran-C

    Publication Year: 1991, Page(s):696 - 708
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    Various techniques for using simultaneous Global Positioning System (GPS)/Loran data to estimate the propagation uncertainties that limit the absolute accuracy of Loran-C are discussed. Significant improvements in the absolute accuracy of Loran can be achieved with very simple calibrations. The absolute accuracy of Loran in the Gulf of Maine without calibration is presented. The maximum and RMS ab... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Tracking a 3D maneuvering target with passive sensors

    Publication Year: 1991, Page(s):725 - 739
    Cited by:  Papers (48)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (764 KB)

    A novel application of the interacting multiple models (IMM) algorithm in which passive infrared sensors are fused for tracking a target maneuvering in three dimensions is discussed. More accurate models of target motion are proposed to improve performance. When the general models are used to describe the maneuvering periods, it is shown that the IMM behaviour is not satisfactory, in that the inno... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Error analysis of quaternion transformations [inertial navigation]

    Publication Year: 1991, Page(s):634 - 639
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    Three transformation formulas that relate the quaternions to the direction cosine matrix used in strapdown inertial systems are derived. An error model associated with the computed direction cosine matrix is briefly discussed. Error analysis is fully evaluated analytically and tabulated for comparison. Transformation errors associated with these formulas are analyzed. The drift errors evaluated un... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Adaptive on-line flux estimation in field-oriented control of an IM

    Publication Year: 1991, Page(s):640 - 645
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    An adaptive technique for the online estimation of the rotor field vector to use as a feedback for the field-oriented control of an induction machine (IM) is described. This method makes use of the stator voltage and rotor speed measurements. It uses the least square estimation technique for identifying the machine parameters to be used in the estimation of the field vector. The position and magni... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Reciprocal radar waveforms

    Publication Year: 1991, Page(s):646 - 654
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    Digitally coded radar waveforms can be used to obtain large time-bandwidth products (pulse compression ratios). It is demonstrated that periodic radar waveforms with zero sidelobes or almost zero sidelobes can be defined. A perfect periodic code is a periodic code whose autocorrelation function has zero sidelobes and whose amplitude is uniform (maximum power efficiency=1). An asymptotically perfec... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Convergence bounds of an SMI/Gram-Schmidt canceler in colored noise

    Publication Year: 1991, Page(s):655 - 666
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (684 KB)

    The performance of the sampled matrix inversion (SMI) adaptive algorithm in colored noise is investigated using the Gram-Schmidt (GS) canceler as an analysis tool. Lower and upper bounds of average convergence are derived, indicating that average convergence slows as the input time samples become correlated. When the input samples are uncorrelated, the fastest SMI algorithm convergence occurs. Whe... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Improved Mapham's inverter for HF space power conversion

    Publication Year: 1991, Page(s):667 - 674
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    An improved Mapham's inverter for high-frequency space power conversion is presented. The proposed inverter system uses a starting commutator to facilitate the starting of the conventional inverter under full-load conditions. The load conditions which cause the starting commutation failure of a conventional Mapham inverter are established. An improved inverter system to overcome the starting failu... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

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