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IEEE Transactions on Aerospace and Electronic Systems

Issue 4 • July 1988

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Displaying Results 1 - 19 of 19
  • Constant gain tracker with variable frame time

    Publication Year: 1988, Page(s):322 - 336
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (389 KB)

    A three-parameter constant-gain recursive filter is augmented by a residual-dependent frame time algorithm that automatically increases sampling rates when a target maneuvers. Computer simulations show that tracking performance is essentially independent of the particular target trajectory. It is found that radial distance errors remain effectively constant over different trajectories. It is the n... View full abstract»

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  • Optical moving target detection with 3-D matched filtering

    Publication Year: 1988, Page(s):327 - 336
    Cited by:  Papers (95)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (839 KB)

    Three-dimensional (3-D) matched filtering has been suggested as a powerful processing technique for detecting weak, moving optical targets immersed in a background noise field. The procedure requires the processing of entire sequences of frames of optical scenes containing the moving targets. The 3-D processor must be properly matched to the target signature and its velocity vector, but will simul... View full abstract»

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  • Variable structure and adaptive control of a synchronous generator

    Publication Year: 1988, Page(s):337 - 345
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (522 KB)

    Damping of synchronous generator oscillations has been investigated by using three types of controllers, i.e., the PI (proportional-integral) controller, the model reference adaptive controller (MRAC) and the variable-structure model-following controller (VSMFC). It was found that the PI controller fails to accommodate itself to the situation where there is a significant change in generator loadin... View full abstract»

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  • Polar ionospheric disturbance effects on NNSS satellite positioning

    Publication Year: 1988, Page(s):360 - 365
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    From the analysis of the United States Navy navigation satellite system (NNSS) positioning data of about 10000 passes, it is clearly found that polar ionospheric disturbance affects the positioning. The positioning error increases with increasing geomagnetic disturbance level (local K-index), and the pass number of position fixes decreases by one or two per day when the K-index is large. These eff... View full abstract»

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  • Resonant inverters for photovoltaic array to utility interface

    Publication Year: 1988, Page(s):377 - 386
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (773 KB)

    A number of high-frequency link power converter schemes suitable for interconnecting a photovoltaic (PV) array to the utility line using resonant inverters are presented. Use of high-frequency resonant inverters (HFRI) results in reduced size, weight and cost. Scheme 1 uses the HFRI-cycloconverter, scheme 2 uses the HFRI-rectifier pulsewidth-modulated voltage source inverter, scheme 3 uses the HFR... View full abstract»

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  • Localization performance of arrays subject to phase errors

    Publication Year: 1988, Page(s):402 - 410
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (708 KB)

    The passive localisation of radiating sources using an array subject to random perturbations in sensor phases is presented. All source signals as well as additive noises observed at the sensors are assumed to be independent identically distributed zero-mean Gaussian random processes. Cramer-Rao bounds are derived for source bearings and ranges for the phase errors at each sensor. It is shown that ... View full abstract»

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  • Analysis of CFAR processors in homogeneous background

    Publication Year: 1988, Page(s):427 - 445
    Cited by:  Papers (315)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1712 KB)

    Five different constant false alarm rate (CFAR) radar processing schemes are considered and their performances analyzed in homogeneous and nonhomogeneous backgrounds, the latter specifically being the multiple target environment and regions of clutter transitions. The average detection threshold for each of the CFAR schemes was computed to measure and compare the detection performance in homogeneo... View full abstract»

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  • Comments on "Comparison of two-sensor tracking methods based on state vector fusion and measurement fusion" by J. Roecker et al

    Publication Year: 1988, Page(s):456 - 457
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (190 KB)

    As shown in the above named work (ibid., vol.24, p.447-9, July, 1988), the improvement in the centralized scheme over the decentralized one was shown to be about 6-8%. The reason is briefly described.<> View full abstract»

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  • Optimal serial distributed decision fusion

    Publication Year: 1988, Page(s):366 - 376
    Cited by:  Papers (64)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    The problem of distributed detection involving N sensors is considered. The configuration of sensors is serial in the sense that the Jth sensor decides using the decision it receives along with its own observation. When each sensor uses the Neyman-Pearson test, the probability of detection is maximized for a given probability of false alarm, at the Nth stage. With two se... View full abstract»

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  • The autocorrelation of m-sequences over nonprime finite fields

    Publication Year: 1988, Page(s):459 - 461
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    Nonbinary m-sequences (maximal length sequences) for spread-spectrum communication systems that have a two-level autocorrelation are presented. The autocorrelation function of an m -sequence over the Galois field of q elements GF(q), where q=pk, for p a prime and k an integer greater than 1, is developed and shown t... View full abstract»

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  • Reception of pulsed signals by detuned receiver: addenda and corrections

    Publication Year: 1988, Page(s):457 - 459
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    The parameters of a pulse perturbed by passage through a filter were examined in a variety of cases in a previous paper by the author (ibid., vol.AES-4, p.486-9, May 1968). One case not covered is that of a rectangular pulse passed through a detuned Gaussian filter; that case is presented, as is the case of a swept Gaussian pulse passed through such a filter, which may be dispersive. Corrections a... View full abstract»

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  • Accuracy of source localization using multipath delays

    Publication Year: 1988, Page(s):346 - 359
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (796 KB)

    The depth and range of underwater source can be estimated from measurements of propagation delay differences along multiple propagation paths. The accuracy of depth and range estimation using the Cramer-Rao lower bound is studied. The formulas derived can be used in conjunction with a propagation medium (nonconstant velocity profile). Explicit formulas for the bounds are derived for the case of ho... View full abstract»

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  • Comparison of two-sensor tracking methods based on state vector fusion and measurement fusion

    Publication Year: 1988, Page(s):447 - 449
    Cited by:  Papers (136)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    There are two approaches to the two-sensor track-fusion problem. Y Bar-Shalom and L. Campo (ibid., vol.AES-22, 803-5, Nov. 1986) presented the state vector fusion method, which combines state vectors from the two sensors to form a new estimate while taking into account the correlated process noise. The measurement fusion method or data compression of D. Willner et al. (1976) combines the measureme... View full abstract»

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  • Detection probability for partially correlated chi-square targets

    Publication Year: 1988, Page(s):411 - 416
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The probability of detection of the sum of N square-law-detected pulses is derived for the case where the signal fluctuation obeys chi-square statistics with four degrees of freedom. P. Swerling's (1960) case III and IV represent the cases where the signal is completely correlated and completely decorrelated, respectively, from pulse to pulse. An exact expression for probability of detect... View full abstract»

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  • Satellite mobile communication and radio positioning system planning aspects

    Publication Year: 1988, Page(s):387 - 396
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    System aspects of mobile communication and position determination by satellite are described. Topics of discussion are the choice of frequency, type of modulation/multiple access and system design, and considering the effects of active and passive intermodulation and multipath interference. Communication performance and position determination analyses are conducted with respect to small-scale dome... View full abstract»

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  • People's Republic of China Cumulative Index on Radar Systems (First Edition) 1978-87

    Publication Year: 1988, Page(s):462 - 472
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    This bibliography of Chinese radar papers was compiled by the PLA Air Force Radar Institute under the sponsorship of the China Institute of Electronics Radar Society. It covers the period from 1978 through 1987 and was prepared under the supervision of the Vice Chairman of the CIE Radar Society. It follows the format of the IEEE AES Cumulative Index on Radar Systems. Entries are listed chronologic... View full abstract»

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  • An anticipative adaptive array for frequency-hopping communications

    Publication Year: 1988, Page(s):449 - 456
    Cited by:  Papers (17)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    To fully utilize the theoretical processing gain achievable when an adaptive array and frequency hopping are combined, frequency compensation is required. Improved versions of an anticipative adaptive array are examined that provide efficient compensation by adapting the complex weights at each antenna element to the appropriate values for a carrier frequency before that frequency is received. The... View full abstract»

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  • Enhancements to a multiple model adaptive estimator/image-tracker

    Publication Year: 1988, Page(s):417 - 426
    Cited by:  Papers (9)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    Three major enhancements to a previously devised multiple model adaptive estimator (MMAE) for target image tracking are developed and analyzed. These are: allowing some of the elemental filters to have rectangular fields of view and to be tuned for target dynamics that are harsher in one direction than others; considering both Gauss-Markov acceleration models and constant turn-rate models for targ... View full abstract»

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  • Covariance matrix estimation errors and diagonal loading in adaptive arrays

    Publication Year: 1988, Page(s):397 - 401
    Cited by:  Papers (490)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    Simulations were used to investigate the effect of covariance matrix sample size on the system performance of adaptive arrays using the sample matrix inversion (SMI) algorithm. Inadequate estimation of the covariance matrix results in adapted antenna patterns with high sidelobes and distorted mainbeams. A technique to reduce these effects by modifying the covariance matrix estimate is described fr... 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