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Aerospace and Electronic Systems, IEEE Transactions on

Issue 3 • Date 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 (4)
    Request Permissions | 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 Permissions | 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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  • Tracking with debiased consistent converted measurements versus EKF

    Publication Year: 1993 , Page(s): 1015 - 1022
    Cited by:  Papers (149)  |  Patents (5)
    Request Permissions | 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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  • Quantitative heat transfer measurements in hypersonic wind tunnels by means of infrared thermography

    Publication Year: 1993 , Page(s): 878 - 893
    Request Permissions | 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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  • Angle and polarization estimation in a coherent signal environment

    Publication Year: 1993 , Page(s): 706 - 716
    Cited by:  Papers (9)  |  Patents (1)
    Request Permissions | 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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  • A fast adaptive null-steering algorithm based on output power measurements

    Publication Year: 1993 , Page(s): 717 - 725
    Cited by:  Papers (3)
    Request Permissions | 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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  • Parallel load-flow algorithm using a decomposition method for space-based power systems

    Publication Year: 1993 , Page(s): 1024 - 1030
    Cited by:  Papers (2)
    Request Permissions | 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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  • Satellite intercept targeting DSP algorithm design and evaluation

    Publication Year: 1993 , Page(s): 726 - 740
    Request Permissions | Click to expandAbstract | PDF file iconPDF (816 KB)  

    A unified processing approach for the detection and localization of satellites or other exoatmospheric targets is presented. Enhanced filtering and centroid determination algorithms were developed based on real-time implementation constraints, mission conditions including accuracy requirements, and signature structure. The signature structure consisted of target returns, high-frequency random nois... View full abstract»

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  • A pure-Cartesian formulation for tracking filters

    Publication Year: 1993 , Page(s): 749 - 754
    Cited by:  Papers (2)
    Request Permissions | 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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  • Range-time-sidelobe reduction technique for FM-derived polyphase PC codes

    Publication Year: 1993 , Page(s): 834 - 840
    Cited by:  Papers (11)  |  Patents (1)
    Request Permissions | 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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  • A tracking algorithm for maneuvering targets

    Publication Year: 1993 , Page(s): 910 - 925
    Cited by:  Papers (26)
    Request Permissions | 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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  • Correlation filters for aircraft identification from radar range profiles

    Publication Year: 1993 , Page(s): 741 - 748
    Cited by:  Papers (71)
    Request Permissions | 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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  • Class D-E resonant DC/DC converter

    Publication Year: 1993 , Page(s): 963 - 976
    Cited by:  Papers (10)  |  Patents (2)
    Request Permissions | 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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  • Autonomous GPS/INS navigation experiment for space transfer vehicle

    Publication Year: 1993 , Page(s): 772 - 785
    Cited by:  Papers (13)  |  Patents (6)
    Request Permissions | 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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  • Performance prediction of the interacting multiple model algorithm

    Publication Year: 1993 , Page(s): 755 - 771
    Cited by:  Papers (47)
    Request Permissions | 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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  • Dim target detection using high order correlation method

    Publication Year: 1993 , Page(s): 841 - 856
    Cited by:  Papers (15)
    Request Permissions | 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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  • Fixed-gain two-stage estimators for tracking maneuvering targets

    Publication Year: 1993 , Page(s): 1004 - 1014
    Cited by:  Papers (15)
    Request Permissions | 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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  • Ionospheric scintillation-induced integration losses for space-based radar

    Publication Year: 1993 , Page(s): 636 - 650
    Request Permissions | 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 method for determining filter spacing in assumed velocity filter banks

    Publication Year: 1993 , Page(s): 1043 - 1046
    Cited by:  Papers (5)
    Request Permissions | 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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  • Statistical tests for surveillance radars

    Publication Year: 1993 , Page(s): 988 - 994
    Cited by:  Papers (1)
    Request Permissions | 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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  • Enhanced variable dimension filter for maneuvering target tracking

    Publication Year: 1993 , Page(s): 786 - 797
    Cited by:  Papers (4)
    Request Permissions | 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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  • Directions-of-arrival estimations of multiple coherent broadband signals

    Publication Year: 1993 , Page(s): 1035 - 1043
    Cited by:  Papers (2)
    Request Permissions | 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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  • 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 Permissions | 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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  • A new approach to robust fault detection and identification

    Publication Year: 1993 , Page(s): 685 - 695
    Cited by:  Papers (53)
    Request Permissions | 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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  • Global communication using a constellation of low Earth meridian orbits

    Publication Year: 1993 , Page(s): 696 - 705
    Cited by:  Patents (1)
    Request Permissions | 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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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