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

    Publication Year: 1993, Page(s):1004 - 1014
    Cited by:  Papers (22)
    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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  • Generalized approach to the small signal modelling of DC-to-DC resonant converters

    Publication Year: 1993, Page(s):894 - 909
    Cited by:  Papers (33)
    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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  • 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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  • 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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  • Capture region for a realistic TPN guidance law

    Publication Year: 1993, Page(s):995 - 1003
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (628 KB)

    This work obtains the capture region for a realistic true proportional navigation (RTPN) guidance law against a nonmaneuvering target where the assumption of constant closing velocity used in the guidance law is relaxed. This is a realistic departure from earlier treatments of TPN. A capture equation is obtained and a qualitative study carried out for both zero and non-zero miss distances. The res... 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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  • 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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  • 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 (16)
    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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  • 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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  • 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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  • 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 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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  • Parallel load-flow algorithm using a decomposition method for space-based power systems

    Publication Year: 1993, Page(s):1024 - 1030
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (480 KB)

    This work presents a method for load-flow analysis of a power system using a decomposition approach. The power system for the US Space Shuttle is used as a model for the load-flow analysis. The decomposition algorithm is well suited for parallel processing implementation and provides an increase in the execution speed 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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  • 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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  • 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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  • 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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  • 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 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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  • Tracking with debiased consistent converted measurements versus EKF

    Publication Year: 1993, Page(s):1015 - 1022
    Cited by:  Papers (221)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (616 KB)

    In tracking applications target motion is usually best modeled in a simple fashion using Cartesian coordinates. Unfortunately, in most systems the target position measurements are provided in terms of range and azimuth (bearing) with respect to the sensor location. This situation requires either converting the measurements to a Cartesian frame of reference and working directly on converted measure... 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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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
Michael Rice
Brigham Young University