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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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  • A new approach to robust fault detection and identification

    Publication Year: 1993, Page(s):685 - 695
    Cited by:  Papers (128)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (692 KB)

    A methodology for instrument fault detection and identification (FDI) in linear dynamical systems subject to plant parameter variations or uncertainties is presented. At the heart of this approach is a robust estimator for which the necessary and sufficient conditions to its existence are outlined. The robust estimator can simultaneously estimate the unmeasurable state variables of the system for ... View full abstract»

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  • A simple fixed-lag algorithm for tracking frequency rate-of-change

    Publication Year: 1993, Page(s):677 - 684
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    A family of simple fixed-lag frequency smoothing algorithms which provide good estimates of both frequency and frequency rate-of-change is reported. The smoothers were developed from a fixed-gain αβ tracker by replacing the recursive derivative estimator with a finite-impulse-response (FIR) differentiator. Simulation results are presented which show that the smoothing algorithms provide... 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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  • Neighboring optimal guidance for aeroassisted orbital transfer

    Publication Year: 1993, Page(s):656 - 665
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    A neighboring optimal guidance scheme for a nonlinear dynamic system is devised with stochastic inputs and perfect measurements as applicable to fuel optimal control of an aeroassisted orbital transfer vehicle. For the deterministic nonlinear dynamic system describing the atmospheric maneuver, a nominal trajectory is determined. Then, taking modeling uncertainties into account, a linear, stochasti... 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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  • 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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  • 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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  • Enhanced variable dimension filter for maneuvering target tracking

    Publication Year: 1993, Page(s):786 - 797
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    An enhancement of the variable dimension (VD) filter for maneuvering-target tracking is presented. The use of measurement concatenation, a procedure whereby fast sampled measurements are stacked while maintaining their proper relationships with the states, leads to significant reduction in estimation error by low processing rate algorithms. The use of double decision logic (DDL) for the maneuver o... View full abstract»

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  • Local and remote track file registration using minimum description length

    Publication Year: 1993, Page(s):651 - 655
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    A blue force platform (own-ship) contains a sensor suite from which a local track file is developed. In addition, using uplinked information from other blue sensors, own-ship develops a remote track file that represents red forces tracked by blue. To determine if own-ship has been inadvertently targeted by friendly forces, it requires the probability that it is in the remote track file and an esti... 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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  • Generalized approach to the small signal modelling of DC-to-DC resonant converters

    Publication Year: 1993, Page(s):894 - 909
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1088 KB)

    A generalized small-signal analysis approach that is based on both the Taylor's series expansion and the state-plane diagram is presented. A generalized discrete small-signal model for a double-ended DC-to-DC resonant converter operating in the continuous conduction mode is also given. Based on the model derived, the frequency responses for two transfer functions, namely, the line-to-output and th... View full abstract»

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  • Multiple hypothesis track confirmation for infrared surveillance systems

    Publication Year: 1993, Page(s):810 - 824
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1252 KB)

    An overall methodology is described for the application of a multiple hypothesis tracking (MHT) algorithm to the infrared (IR) surveillance system problem of establishing tracks on dim targets in a heavy clutter or false alarm background. The authors discuss the manner in which the detection and tracking systems are jointly designed to optimize performance. They present approximate methods that ca... 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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  • Statistical tests for surveillance radars

    Publication Year: 1993, Page(s):988 - 994
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    Acceptance tests for surveillance radars are often formulated in terms of the cumulative probability of detection (P) at a specified range. Statistical methods for determining point and interval estimates of P from a small number of flight tests are discussed. Three types of estimators, frequency, Bayesian, and maximum likelihood, are studied both analytically and by Monte Carlo ... View full abstract»

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  • Fixed-gain two-stage estimators for tracking maneuvering targets

    Publication Year: 1993, Page(s):1004 - 1014
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (716 KB)

    The two-stage alpha-beta-gamma estimator is proposed as an alternative to adaptive gain versions of the alpha, beta and alpha, beta, and gamma filters for tracking maneuvering targets. The aim is to achieve fixed-gain, variable dimension filtering. The two-stage alpha-beta-gamma estimator is derived from the two-stage Kalman estimator, and the noise variance reduction matrix and steady-state error... 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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  • 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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  • 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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  • 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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  • 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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  • A resonant DC-DC transformer

    Publication Year: 1993, Page(s):926 - 934
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    The characteristics of a push-pull parallel resonant converter (PPRC) when operated as a DC-DC transformer were investigated theoretically and experimentally. In the DC-DC transformer region, the voltage transfer ratio of the PPRC was found to be practically constant and independent of the input voltage and load. In this mode, all the switching elements operate in the zero voltage switching (ZVS) ... 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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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