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Aerospace and Electronic Systems, IEEE Transactions on

Issue 3 • Date May 1990

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Displaying Results 1 - 18 of 18
  • A recursive moving-target-indication algorithm for optical image sequences

    Publication Year: 1990 , Page(s): 434 - 440
    Cited by:  Papers (41)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (681 KB)  

    A recursive track-before-detect algorithm, producing potentially large signal-to-noise ratio (SNR) gains under realizable conditions, is described. The basic relation has the form of a linear, constant-coefficient difference equation with a unity magnitude damping factor. Known as recursive moving-target-indication (RMTI), this procedure adapts easily to digital processing and achieves SNR gains c... View full abstract»

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  • Federated square root filter for decentralized parallel processors

    Publication Year: 1990 , Page(s): 517 - 525
    Cited by:  Papers (118)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (820 KB)  

    An efficient, federated Kalman filter is developed for use in distributed multisensor systems. The design accommodates sensor-dedicated local filters, some of which use data from a common reference subsystem. The local filters run in parallel, and provide sensor data compression via prefiltering. The master filter runs at a selectable reduced rate, fusing local filter outputs via efficient square ... View full abstract»

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  • Simplified analysis of PWM converters using model of PWM switch. Continuous conduction mode

    Publication Year: 1990 , Page(s): 490 - 496
    Cited by:  Papers (318)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (600 KB)  

    A circuit-oriented approach to the analysis of pulsewidth modulation (PWM) converters is presented. This method relies on the identification of a three-terminal nonlinear device, called the PWM switch, which consists of only the active and passive switches in a PWM converter. Once the invariant properties of the PWM switch are determined, its average equivalent circuit model can be derived. This m... View full abstract»

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  • Intersatellite tracking methods for clustered geostationary satellites

    Publication Year: 1990 , Page(s): 469 - 474
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (579 KB)  

    With the assumption that two satellites are placed in geostationary orbit at a small constant longitudinal separation, the feasibility of relative orbit determination by means of intersatellite tracking is studied analytically. Two types of tracking are examined: range-and-angle tracking and range-only tracking. Two-body orbital motion with first-order approximation of the relative orbital motion ... View full abstract»

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  • Closed-form solution of pure proportional navigation

    Publication Year: 1990 , Page(s): 526 - 533
    Cited by:  Papers (49)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (563 KB)  

    The closed-form solution of the equations of motion of an ideal missile pursuing a nonmaneuvering target according to the pure proportional navigation law is obtained as a function of the polar coordinates for all real navigation constants N⩾2. The solution is given in the form of a uniformly convergent infinite product which reduces to a product of a finite number of factors if the n... View full abstract»

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  • Adaptive array transient sidelobe levels and remedies

    Publication Year: 1990 , Page(s): 560 - 568
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (718 KB)  

    The transient sidelobe level of a sidelobe canceler (SLC) is a function of the external noise environment, the number of adaptive auxiliary antennas, the adaptive algorithm used, auxiliary antenna gain margins, and the number of samples used to calculate the adaptive weights. An analytical result for the adaptive sidelobe level is formulated for the case when the adaptive algorithm is the open-loo... View full abstract»

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  • Counter-intuitive results cast in an electronic warfare framework

    Publication Year: 1990 , Page(s): 506 - 510
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (429 KB)  

    Four sample electronic warfare (EW) problems are described in an effort to stimulate thought on various basic issues and assumptions encountered in EW and other fields. The problems are choosing a better sensor, transmitter, sequence, and search strategy View full abstract»

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  • Detection of weak, subpixel targets using mesh-connected cellular automata

    Publication Year: 1990 , Page(s): 548 - 559
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1102 KB)  

    Effective use of military cellular automata such as military data array processor (MilDAP) and geometric arithmetic parallel processor (GAPP), in weak, subpixel target detection is shown to be possible by using new signal processing regimes based on binary ranking filter theory. By using binary ranking filters, the MilDAP can furnish 6 dB of processing gain against white Gaussian noise while monit... View full abstract»

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  • The effects of IF bandpass mismatch errors on adaptive cancellation

    Publication Year: 1990 , Page(s): 455 - 468
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1002 KB)  

    The effects of IF bandpass mismatch errors on adaptive cancellers are investigated. Frequency mismatch errors occur because of errors in the synthesis process of the bandpass filters which are designed to be identical and are in each input channel. Tapped-delay line transversal filters can be used to compensate for these frequency mismatches and thus improve cancellation performance. A pole/zero e... View full abstract»

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  • Information type filters for tracking a maneuvering target

    Publication Year: 1990 , Page(s): 441 - 454
    Cited by:  Papers (14)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1059 KB)  

    Two previously proposed adaptive covariance-type Kalman filtering techniques for tracking maneuvering targets (see Y.T. Chan et al. ibid., p.237-44, Mar. 1979, and Z. Tang et al. Report, Department of Electrical and Computer Engineering, Oregon State University, Corvallis, Oct. 1983) are developed further to utilize the information-type Kalman filter. These adaptive information-type filters are de... View full abstract»

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  • Simplified analysis of PWM converters using model of PWM switch. II. Discontinuous conduction mode

    Publication Year: 1990 , Page(s): 497 - 505
    Cited by:  Papers (142)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (677 KB)  

    For pt.I see ibid., vol.26, no.3, p.490-6 (1990). According to the method of state-space averaging, when a pulsewidth modulation (PWM) converter enters discontinuous conduction mode (DCM), the inductor current state is lost from the average model of the converter. It is shown that there is neither theoretical nor experimental justification for the disappearance of the inductor state as claimed by ... View full abstract»

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  • Ground monitoring schemes for GPS integrity channel

    Publication Year: 1990 , Page(s): 481 - 489
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (810 KB)  

    Issues involved in the design and implementation of the ground monitor segment Global Positioning System (GPS) are analyzed. In particular, two alternative ground monitoring schemes are presented and compared, one using classified GPS information, and the other not. For each scheme, processing functions that must be performed by the ground monitoring segment are identified, considering both the im... View full abstract»

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  • Tracking targets with constant heading and variable speed

    Publication Year: 1990 , Page(s): 543 - 547
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (411 KB)  

    Two estimation procedures for tracking targets moving with variable speed in a fixed direction are presented and shown to be maximum likelihood estimators under differing sets of assumptions. Monte Carlo simulations are used to compare the accuracy of each method in a realistic tracking scenario. For miss-distance and heading estimation, it is often more accurate to make an approximate choice of s... View full abstract»

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  • Collapsing losses of peak signal integrators

    Publication Year: 1990 , Page(s): 577 - 581
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (448 KB)  

    Collapsing losses are computed for systems in which the peak return of K samples of noise plus one sample of signal-plus-noise are integrated over N looks. The statistical approach, collapsing losses, and an application are described. The peak integrator is found to have substantially lower collapsing losses than conventional systems in which the average, not the peak, is integra... View full abstract»

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  • An effect of range-heterogeneous clutter on adaptive Doppler filters

    Publication Year: 1990 , Page(s): 475 - 480
    Cited by:  Papers (22)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (542 KB)  

    The practical implementation of adaptive Doppler filters requires estimates of clutter parameters to determine the adaptive weights. A method of deriving the estimate via the sample matrix inversion (SMI) algorithm using multiple data snapshots from adjacent range cells is presented. For homogeneous clutter environments, the results of this technique asymptotically approach the optimum (a priori k... View full abstract»

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  • High-performance EHA controls using an interior permanent magnet motor

    Publication Year: 1990 , Page(s): 534 - 542
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (991 KB)  

    A controller for a high-performance electrohydrostatic actuator (EHA) using an interior permanent magnet (IPM) synchronous motor to produce servo motion is described. The buried-magnet design of the IPM motor yields desired characteristics such as high efficiency, robust rotor construction, and wide operating speed range. Power converter size is minimized by using insulated-gate bipolar transistor... View full abstract»

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  • Detection analysis of the MX-MLD with noncoherent integration

    Publication Year: 1990 , Page(s): 569 - 576
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (635 KB)  

    The detection performance of the maximum mean level detection (MX-MLD) when noncoherent integration is used under both nonfluctuating and chi-square fluctuating target models is analyzed. Finite series are obtained in all cases. Required thresholds and constant false-alarm rate loss curves are presented, with emphasis on the important Swerling case II model View full abstract»

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  • Distributed computation for a tree network with communication delays

    Publication Year: 1990 , Page(s): 511 - 516
    Cited by:  Papers (34)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (578 KB)  

    Tree networks of communicating processors are examined with the objective of solving a computational problem in a minimal amount of time. The processors in the networks may be equipped either with or without front-end processors for communicating of loading. The determination of the optimal division of processing load is discussed for the network with and the network without front-end processors. ... 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
Lance Kaplan
Army Research Laboratory