IEEE Transactions on Aerospace and Electronic Systems

Volume 29 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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  • 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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  • 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 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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  • Dim target detection using high order correlation method

    Publication Year: 1993, Page(s):841 - 856
    Cited by:  Papers (30)
    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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  • Global communication using a constellation of low Earth meridian orbits

    Publication Year: 1993, Page(s):696 - 705
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    The concept of meridian orbits is briefly reviewed. It is shown that, if a satellite in the meridian orbit makes an odd number (>1) of revolutions per day, then the satellite passes over the same set of meridians twice a day. Satellites in such orbits pass over the same portion of the sky twice a day and every day. This enables a user to adopt a programmed mode of tracking, thereby avoiding a c... View full abstract»

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  • Range-time-sidelobe reduction technique for FM-derived polyphase PC codes

    Publication Year: 1993, Page(s):834 - 840
    Cited by:  Papers (23)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    A simple, easy to implement technique is presented that can significantly reduce the range-time-sidelobes of a class of polyphase pulse compression codes. This technique reduces the highest sidelobes to only one code element magnitude independent of effective pulse compression ratio. The codes considered are polyphase codes that are derived from the step-approximation-to-linear-frequency-modulatio... View full abstract»

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  • Performance prediction of the interacting multiple model algorithm

    Publication Year: 1993, Page(s):755 - 771
    Cited by:  Papers (83)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1136 KB)

    The interacting multiple model (IMM) algorithm has been shown to be one of the most cost-effective estimation schemes for hybrid systems. Its performance, however, could only be evaluated via expensive Monte Carlo simulations. An effective hybrid approach to the performance evaluation without recourse to simulations is presented. This approach is based on a scenario-conditional performance measure... 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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  • 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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  • A pure-Cartesian formulation for tracking filters

    Publication Year: 1993, Page(s):749 - 754
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    A pure-Cartesian formulation is presented for angle-only and angle-plus-range tracking filters. Unlike conventional angle-only filters, which use target elevation and bearing as measurements, the filter expresses the sensor measurements in Cartesian coordinates. Consequently, the filter performs equally well for any line-of-sight (LOS) geometry, even when target elevation approaches or is equal to... 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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  • Multiple hypothesis track confirmation for infrared surveillance systems

    Publication Year: 1993, Page(s):810 - 824
    Cited by:  Papers (22)
    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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  • Estimation using subjective knowledge with tracking applications

    Publication Year: 1993, Page(s):610 - 623
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1116 KB)

    Within the framework of classical estimation theory, there is no technically legitimate way to utilize knowledge that cannot be codified by either deterministic or strict probability models. The authors introduce a theoretically defensible approach called coordinated objective/subjective estimation (COSE) for the simultaneous incorporation of both objective and subjective knowledge in estimation. ... 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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  • Correlation filters for aircraft identification from radar range profiles

    Publication Year: 1993, Page(s):741 - 748
    Cited by:  Papers (105)
    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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  • Energy-conservation approach to modeling PWM DC-DC converters

    Publication Year: 1993, Page(s):1059 - 1063
    Cited by:  Papers (119)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    A systematic method is presented for including parasitic resistances and offset voltage sources of power switches in averaged dynamic large-signal, DC, and small-signal circuit models of pulse-width modulated (PWM) converters operating in continuous conduction mode (CCM). This method is based on the principle of energy conservation. The approach takes into account the inductor current ripple. For ... View full abstract»

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  • A tracking algorithm for maneuvering targets

    Publication Year: 1993, Page(s):910 - 925
    Cited by:  Papers (45)
    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 new approach to robust fault detection and identification

    Publication Year: 1993, Page(s):685 - 695
    Cited by:  Papers (139)
    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 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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  • Biparametric CFAR procedures for lognormal clutter

    Publication Year: 1993, Page(s):798 - 809
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    The authors consider procedures for constant false alarm rate in lognormal clutter, accounting for variations of both the scale and a shape parameter of the clutter. Adaptivity to both parameters is obtained through biparametric estimation based on a sliding window surrounding the radar cell under test. Some procedures exploiting best linear unbiased estimation (BLUE) are presented and compared to... 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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  • 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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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
Michael Rice
Brigham Young University