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IEEE Transactions on Aerospace and Electronic Systems

Issue 3 • July 1993

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Displaying Results 1 - 25 of 47
  • The hit array: a synthesis tool for multiple access frequency hop signals

    Publication Year: 1993, Page(s):624 - 635
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (895 KB)

    The hit array formalism was developed for the analysis of general frequency hop waveforms, in the context of coherent active radar and sonar echolocation systems, or multiple access spread spectrum communications. This formalism is shown to be useful for synthesis as well. Necessary and sufficient conditions are derived for a given hit array to be realizable, i.e., to correspond to a valid frequen... View full abstract»

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  • Comments on "Comments on Mismatched filter design for periodical binary phased signals" by V.P. Ipatov

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (106 KB)

    In a comment on a paper by H. Rohling and W. Plagge (ibid., vol.25, no.6, p.890-896, Nov. 1989), V.P. Ipatov (ibid., vol.27, no. 6, p.906-908, Nov. 1991) pointed out that he had already suggested and investigated sequences with zero sidelobes in their cross-correlation function as early as in 1977. G. Sarafin et al., the present commenters, draw attention to their own work (ibid., vol.AES-23, no.5... View full abstract»

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  • Precision tracking with segmentation for imaging sensors

    Publication Year: 1993, Page(s):977 - 987
    Cited by:  Papers (32)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1032 KB)

    Precision target tracking based on data obtained from imaging sensors when the target is not fully visible during tracking is addressed. The image is divided into several layers of gray level intensities and thresholded. A binary image is obtained and grouped into clusters using image segmentation. The association of the various clusters to the track to be estimated relies on both the motion and p... View full abstract»

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  • A linear prediction approach to Doppler mean frequency retrieval in the presence of ground clutter

    Publication Year: 1993, Page(s):1050 - 1058
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    Linear-prediction-based methods are applied to mean Doppler frequency estimation of weather radar signals in the presence of ground clutter when only a small number of samples is available for processing. The ability of these methods to resolve weather signals from ground clutter in unfavorable conditions, i.e., when the clutter is stronger and its spectrum is narrower than that of the signal, is ... View full abstract»

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  • Class D-E resonant DC/DC converter

    Publication Year: 1993, Page(s):963 - 976
    Cited by:  Papers (11)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (892 KB)

    A resonant DC/DC converter is introduced, along with its analysis and experimental results. It consists of a Class D resonant inverter and a Class E rectifier. The Class D inverter ensures a low peak voltage across the transistors and the Class E rectifier offers low switching losses and noise. An analysis leading to design equations is carried out. Experimental results are given for a 50-W conver... View full abstract»

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  • Total information processor for 121.5/243 MHz SARSAT signals

    Publication Year: 1993, Page(s):866 - 877
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (812 KB)

    Search and rescue satellite-aided tracking (SARSAT) has certain shortcomings which could possibly be ameliorated by employing a more extensive signal processing strategy. The approach proposed is based on partially compensating for the Doppler shift, which then permits the data processing windows to be increased significantly. Incorporating a ranking technique with the conventional fast Fourier tr... View full abstract»

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  • Matched filter response of a linear array with time-varying phase weights

    Publication Year: 1993, Page(s):1046 - 1050
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    Phased-array antennas used in radars to transmit broadband linear frequency modulated (LFM) signals suffer from array dispersion. Array dispersion decreases the matched filter signal-to-noise ratio and the range resolution of the radar. By allowing the phase weights to vary in time the amount of array dispersion can be greatly reduced and the useful instantaneous bandwidth of the array increased. ... View full abstract»

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  • ISAR using Thomson's multiwindowed adaptive spectrum estimation method

    Publication Year: 1993, Page(s):1065 - 1070
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    The authors compare two of Thomson's multiwindowed spectral estimation methods to conventional windowed discrete Fourier transform (DFT) methods for generating inverse synthetic-aperture radar (ISAR) images. The compared images are generated from synthetic data and data obtained from the IPIX research radar. The images show that Thomson's adaptive multiwindowed spectral estimation method is superi... View full abstract»

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  • Universal linearization concept for extended Kalman filters

    Publication Year: 1993, Page(s):946 - 962
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (996 KB)

    The performance of a universal-linearization-concept-based extended Kalman filter (EKF) is evaluated by experimentally comparing its performance to that of a classical, linearization-based EKF, in the case of a simple nonlinear dynamical system. Instances of superior performance of the universal-linearization-based EKF are observed. In the case of nonlinear dynamics and linear measurements, the es... View full abstract»

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  • A 10 kW DC-DC converter using IGBTs with active snubbers

    Publication Year: 1993, Page(s):857 - 865
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    This full bridge DC-DC converter employs zero voltage switching (ZVS) on one leg and zero current switching (ZCS) on the other. This technique produces exceptionally low insulated-gate bipolar transistor (IGBT) switching losses through the use of an active snubber that recycles energy back to the source. Experimental results are presented for a 10-kW, 20-kHz converter View full abstract»

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  • Computation of the circular error probability (CEP) integral

    Publication Year: 1993, Page(s):1023 - 1024
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (108 KB)

    A substantial portion of the findings of J.T. Gillis (ibid., vol.27, no.6, p.906-910, Nov. 1991) were reported in the open literature nearly 45 years ago, using far simple methods. An expression for the circular error probability (CEP) which takes into account the correlation between two jointly Gaussian random variables (an aspect overlooked by Gillis) is derived and numerical results are present... View full abstract»

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  • Autonomous GPS/INS navigation experiment for space transfer vehicle

    Publication Year: 1993, Page(s):772 - 785
    Cited by:  Papers (23)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1152 KB)

    An experiment is described to validate the concept of developing an autonomous integrated spacecraft navigation system using onboard Global Positioning System (GPS) and inertial navigation system (INS) measurements. Previous work by the authors (1988, 1990) has demonstrated the feasibility of integrating GPS measurements with INS measurements to provide a total improvement in spacecraft navigation... View full abstract»

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  • A method for determining filter spacing in assumed velocity filter banks

    Publication Year: 1993, Page(s):1043 - 1046
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    An implementation of the Chen equation is presented along with an expanded set of results. A number of important system tradeoffs, such as the number of filters as a function of the acceptable loss factor, is demonstrated. In order to accomplish this, a method is presented for computing the maximum speed or angular mismatch between a target and velocity filter for a given acceptable loss in SNR. T... View full abstract»

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  • A derivation of an analytic expression for the tracking index for the alpha-beta-gamma filter

    Publication Year: 1993, Page(s):1064 - 1065
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    The authors derive an analytic expression for the alpha of an alpha-beta-gamma filter in terms of the tracking index. The result permits a direct calculation of alpha from a simple analytic expression instead of using numerical techniques View full abstract»

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  • A tracking algorithm for maneuvering targets

    Publication Year: 1993, Page(s):910 - 925
    Cited by:  Papers (44)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1032 KB)

    A methodology for the tracking of maneuvering targets is presented. A quickest-detection scheme based on the innovation sequence is developed for a prompt detection of target maneuvers. The optimal length of a sliding window that minimizes the maneuver detection delay for a given false-alarm rate is determined. After maneuver detection, the system model is modified by adding a maneuver term. A rec... View full abstract»

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  • Maximum power tracking in parallel connected converters

    Publication Year: 1993, Page(s):935 - 945
    Cited by:  Papers (17)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (828 KB)

    A control scheme for parallel connected converter systems that will transfer the maximum available power from a nonideal voltage source is presented. Monitoring the rates of change in both the average input current and average input power from the source in each switching period, the proposed control method can dynamically regulate the DC-DC converter system to track the peak power of the source. ... View full abstract»

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  • Correlation filters for aircraft identification from radar range profiles

    Publication Year: 1993, Page(s):741 - 748
    Cited by:  Papers (101)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    The potential for identifying aircraft using one or more radar range profiles, in conjunction with a correlator, is investigated. Two types of filter which maximize the expected value of certain correlation peaks are described. The effectiveness of one type of filter was investigated in identification experiments using an extensive data set of real radar range profiles of 24 different aircraft. Th... View full abstract»

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  • Dim target detection using high order correlation method

    Publication Year: 1993, Page(s):841 - 856
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1180 KB)

    This work presents a method for clutter rejection and dim target track detection from infrared (IR) satellite data using neural networks. A high-order correlation method which recursively computes the spatio-temporal cross-correlations between data of several consecutive scans is developed. The implementation of this scheme using a connectionist network is presented. Several important properties o... View full abstract»

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  • Ionospheric scintillation-induced integration losses for space-based radar

    Publication Year: 1993, Page(s):636 - 650
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1288 KB)

    An estimate of the impact of very severe ionospheric conditions on the coherent and noncoherent integration process from a two-way, transionospheric, propagation path is obtained for a specific type of frequency-diverse waveform. A bound on the total integration loss that would result from using this waveform during such ionospheric conditions is obtained through the analysis of data from the wide... View full abstract»

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  • Quantitative heat transfer measurements in hypersonic wind tunnels by means of infrared thermography

    Publication Year: 1993, Page(s):878 - 893
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1256 KB)

    A description of infrared (IR) thermography, as it is employed in a hypersonic blowdown wind tunnel for the acquisition of high quality two-dimensional heat transfer data over aerodynamic surfaces, is given. It is shown that the availability of an IR scanning radiometer and a standard digital image processing (DIP) system in the laboratory provides the means for highly efficient (in terms of time ... View full abstract»

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  • Constrained bandwidth waveforms with minimal dilation sensitivity

    Publication Year: 1993, Page(s):666 - 676
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (748 KB)

    Bandpass waveforms which have envelopes which are insensitive to this velocity-induced time dilation can be efficiently processed by narrowband receivers in which envelope correlation is fixed and Doppler tested using fast Fourier transform (FFT) processing. The peak level of the waveform ambiguity function (AF) can be used to gauge the distortion of the waveform induced by dilation. The degree of... View full abstract»

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  • Angle and polarization estimation in a coherent signal environment

    Publication Year: 1993, Page(s):706 - 716
    Cited by:  Papers (16)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    It is shown how a uniform linear array of crossed dipoles may be used with the ESPRIT algorithm and spatial smoothing techniques to estimate the arrival directions and polarizations of incoming coherent plane waves. Some examples showing typical performance are presented. One method of smoothing can be used where it is necessary to estimate both the arrival angles and polarizations of signals. Two... View full abstract»

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  • Electrooptical navigation for aircraft

    Publication Year: 1993, Page(s):825 - 833
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (908 KB)

    Concurrently with the development of guidance laws for low-altitude rotorcraft flight operations, efforts are underway to develop automated systems for locating the terrain and the obstacles using inputs from passive electrooptical sensors such as TV cameras and infrared imagers. A passive obstacle location algorithm that uses image sequences from cameras undergoing translational and rotational mo... View full abstract»

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  • A fast adaptive null-steering algorithm based on output power measurements

    Publication Year: 1993, Page(s):717 - 725
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    Presented and investigated here is a simple and fast adaptive algorithm for linear power inversion arrays whose nulls can be accurately steered by controlling the element weights. Based on measurements of the powers of the three signals derived from the array output and the output of an auxiliary beamformer, the algorithm tracks unknown jammers in the environment by steering the nulls of the array... View full abstract»

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  • Directions-of-arrival estimations of multiple coherent broadband signals

    Publication Year: 1993, Page(s):1035 - 1043
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    In the problems of estimating the directions-of-arrival (DOAs) of multiple coherent broadband signals, the coherent signal-subspace (CSS) method (H. Wang and M. Kaveh, 1990) and the coherent interpolation (CI) method (M. Wax et al., 1985) have been proposed. The performances of the two methods and that of total least squares estimation (LSE) of signal parameters via rotational invariance technique... 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