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Aerospace and Electronic Systems, IEEE Transactions on

Issue 5 • Date Sept. 1990

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Displaying Results 1 - 20 of 20
  • Comments, with reply, on "Lyapunov stability designs for switching regulator/low-pass filter system" by M.L. Brooks

    Publication Year: 1990 , Page(s): 889 - 893
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (430 KB)  

    Erroneous conclusions reached in the original paper (see ibid., vol.25, no.5, p.602-10, Sept. 1989) concerning the applicability of the Rough criterion in studying the stability of fourth-order linear systems and its relationship with Lyapunov's stability tests are corrected. A brief review of relevant theory is presented, and faults in the analysis that led to these conclusions are identified. Th... View full abstract»

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  • Comments, with reply, on "Status of CR-like lower bounds for nonlinear filtering" by T.H. Kerr

    Publication Year: 1990 , Page(s): 895 - 896
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (388 KB)  

    The commenters object to criticisms of their work that appeared in the above-titled paper (ibid., vol.25, no.5, p.590-601, Sept. 1989) and provide a defense of their results. The author presents further arguments to buttress his claims.<> View full abstract»

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  • The split symbol moments SNR estimator in narrow-band channels

    Publication Year: 1990 , Page(s): 737 - 747
    Cited by:  Papers (26)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (572 KB)  

    The split symbol moments estimator (SSME) is an algorithm that is designed to estimate symbol signal-to-noise ratio (SNR) in the presence of additive white Gaussian noise (AWGN). The performance of the SSME algorithm in bandlimited channels is examined, and the effects of the resulting intersymbol interference (ISI) are quantified. All results obtained are in closed form and can be easily evaluate... View full abstract»

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  • On adaptive multiband signal detection with the SMI algorithm

    Publication Year: 1990 , Page(s): 768 - 773
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (428 KB)  

    In a nonstationary and/or nonhomogeneous interference environment, an adaptive system for target detection may suffer a severe performance degradation due to the lack of a sufficient amount of data from which the system can learn (estimate) the statistics of the environment. The detection performance of an adaptive system, which employs a frequency diversity (multiband) signaling waveform and a mu... View full abstract»

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  • Extended solution to multiple maneuvering target tracking

    Publication Year: 1990 , Page(s): 876 - 887
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (584 KB)  

    An improved algorithm for tracking multiple maneuvering targets is presented. This approach is implemented with an approximate adaptive filter consisting of the one-step conditional maximum-likelihood technique together with the extended Kalman filter and an adaptive maneuvering compensator. In order to avoid the extra computational burden of considering events with negligible probability, a valid... View full abstract»

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  • Simple solutions for hyperbolic and related position fixes

    Publication Year: 1990 , Page(s): 748 - 753
    Cited by:  Papers (124)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (396 KB)  

    Navigation fixed from range differences to three stations and an additional piece of information are investigated. It is shown that if the additional information is the navigator altitude, or the range difference to a fourth station, the computation of the navigation fix is reduced to finding the roots of a quadratic. If the additional information is the range to another station, or that the navig... View full abstract»

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  • On mapping a tracking algorithm onto parallel processors

    Publication Year: 1990 , Page(s): 774 - 791
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1484 KB)  

    The problem of mapping the tasks of a multitarget tracking algorithm onto parallel computing architectures to maximize speedup is considered. An asymptotically optimal mapping algorithm is developed and applied to study the effects of task granularity and processor architectures on the speedup. From the simulation results, it is concluded that task granularity and the parallelization of clustering... View full abstract»

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  • Active sonar application of a U-D square root PDAF

    Publication Year: 1990 , Page(s): 850 - 857
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (460 KB)  

    The probabilistic data association filter (PDAF) is a suboptimal approach to tracking a target in the presence of clutter. In the PDAF implementation, the Kalman measurement update is performed over the set of validated measurements and the Kalman time update is used to propagate the PDAF measurement update. A popular approach to obtaining a numerically stable set of Kalman update equations is to ... View full abstract»

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  • A new CFAR sidelobe canceler algorithm for radar

    Publication Year: 1990 , Page(s): 792 - 803
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (816 KB)  

    Signal or target detection is sometimes complicated by the presence of strong interference. When this interference occurs mainly in the sidelobes of the antenna pattern, a solution to this problem is realized through a sidelobe canceler (SLC) implementation. Since the false-alarm probability is a system parameter of special importance in radar, an interference-canceling technique for radar applica... View full abstract»

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  • A passive tracking filter for missile capture

    Publication Year: 1990 , Page(s): 867 - 875
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (612 KB)  

    A practical filter is suggested for ground-based missile tracking in a capture-guidance mode utilizing angle-only measurements from a passive missile sensor, and its performance is evaluated by a realistic system-simulation study. A missile-acceleration model that provides inputs to the filter is also suggested. The filter has a decoupled structure of independent azimuth and elevation channels, wh... View full abstract»

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  • Performance analysis of PNG laws for randomly maneuvering targets

    Publication Year: 1990 , Page(s): 713 - 721
    Cited by:  Papers (36)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (616 KB)  

    The performance of the conventional proportional navigation guidance (PNG) law for a randomly maneuvering target is considered. By means of the Lyapunov method, it is proved that an ideal missile guided by the conventional PNG law can always intercept a target which maneuvers with time-varying normal acceleration provided that the navigation constant is sufficiently large. The authors also propose... View full abstract»

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  • Rapid radar backscatter simulation of detailed targets

    Publication Year: 1990 , Page(s): 858 - 866
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (780 KB)  

    A method of rapidly simulating the radar backscatter signatures of targets moving relative to a fuzzing radar located on an interceptor missile is described. A geometric optics approach is used to estimate the radar return from a detailed target surface described by functions which are almost everywhere curvature continuous. The method exploits the second-order continuity of the target description... View full abstract»

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  • Recent advances in analog signal processing

    Publication Year: 1990 , Page(s): 818 - 849
    Cited by:  Papers (4)  |  Patents (15)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3224 KB)  

    Analog signal processors which perform convolution, correlation, matched filtering, and Fourier transformation are considered. Specifically, the authors focus on one- and two-dimensional signal processors using charge-coupled-device, surface-acoustic-wave, acoustooptic, and superconductive components. The device performances are compared in terms of parameters such as signal bandwidth, time-bandwi... View full abstract»

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  • Bistatic radar without transmitted signal-covert altimetry concept

    Publication Year: 1990 , Page(s): 732 - 736
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (324 KB)  

    A technique for performing altimetric functions (and possibly very-low-resolution imaging radar) without the transmission of a signal is suggested. The system could benefit an invasive aerospace platform that needs to remain totally electronically silent. The concept uses naturally occurring galactic noise as the illumination signal. A rapid and low-cost processor is also suggested. The results de... View full abstract»

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  • Cascaded detector for multiple high-PRF pulse Doppler radars

    Publication Year: 1990 , Page(s): 754 - 767
    Cited by:  Papers (4)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1036 KB)  

    A postdetection design methodology for a multiple high-pulse-repetition frequency (PRF) pulse Doppler radar has been developed. The postdetection processor consists of an M out of N detector where range and target ambiguities are resolved, followed by a square-law detector which enhances the minimum signal-to-noise (S/N) power-ratio per pulse burst performance. For given probabil... View full abstract»

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  • Causal probabilistic model for evaluating future transoceanic airline separations

    Publication Year: 1990 , Page(s): 804 - 817
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1104 KB)  

    With the advent of automatic dependent surveillance (ADS), a detailed probability model of aircraft cross-track deviations is required to determine the impact of ADS. A suitable causal probability model is presented where normal navigation, degradation, pilot blunder, and failure are each modeled by Gaussian density functions with mean and standard deviations defined by the physics of the event. T... View full abstract»

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  • Optimum time delay detection and tracking

    Publication Year: 1990 , Page(s): 700 - 712
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (960 KB)  

    An optimum solution to the time delay tracking problems has been previously achieved by recursively computing the time-delay posterior probability density function (PDF), or time-delay PDF conditioned on knowing all observed data, by numerical means. Any optimum estimate is determined from the posterior PDF. The same approach is extended to an optimum solution for the time delay detection problem ... View full abstract»

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  • Theory of operation of a two-axis-rate gyro

    Publication Year: 1990 , Page(s): 722 - 731
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (652 KB)  

    A description, the theory of operation, and the errors of an elastically supported, two-axis-rate gyroscope are presented. In this gyroscope, the rotating inertial element is restrained by a rotating spring, thus eliminating threshold effects and allowing operation in an open-loop mode. Equations for the overall performance under static and dynamic conditions, including characteristic errors, are ... View full abstract»

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  • The Whirlwind computer project

    Publication Year: 1990 , Page(s): 903 - 910
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1620 KB)  

    The authors describe how they led the development of the Whirlwind I (WWI) digital computer and its evolution into the SAGE (Semi-Automatic Ground Environment) air-defense system for North America. The project from 1945 through 1956, beginning at a time when no general-purpose, high-speed, electronic computer existed, was from the start dedicated to performance and reliability suitable for real-ti... View full abstract»

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  • Tracking targets using adaptive Kalman filtering

    Publication Year: 1990 , Page(s): 691 - 699
    Cited by:  Papers (19)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (484 KB)  

    A simple algorithm for estimating the unknown process noise variance of an otherwise known linear plant, using a Kalman filter is suggested. The process noise variance estimator is essentially dead beat, using the difference between the expected prediction error variance, computed in the Kalman filter, and the measured prediction error variance. The estimate is used to adapt the Kalman filter. The... 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