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Aerospace and Electronic Systems, IEEE Transactions on

Issue 1 • Date Jan. 1971

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Displaying Results 1 - 25 of 36
  • Table of contents

    Publication Year: 1971 , Page(s): c1
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  • IEEE Aerospace and Electronic Systems Group

    Publication Year: 1971 , Page(s): c2
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  • From the Editors

    Publication Year: 1971 , Page(s): 1
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  • Crime Deterrent Transponder System

    Publication Year: 1971 , Page(s): 2 - 22
    Cited by:  Papers (2)  |  Patents (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (6657 KB)  

    A review of some of the underlying reasons for crime is presented, together with a perspective-setting view of the present status of crime in the United States. A statistical analysis of the number of repeaters is presented as the basis for a crime control system consisting of a transponder carried by each convicted person after he is released from confinement. Real-time tracking of these transpon... View full abstract»

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  • Electromagnetic Spectrum Control Programs

    Publication Year: 1971 , Page(s): 23 - 26
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1497 KB)  

    The radio frequency spectrum is becoming increasingly saturated and polluted due to intensified use and unnecessary radiations and is being taxed severely to meet man's communications-electronics needs. Additional corrective measures are necessary-improved standards, increased concern for conservation of the resource, greater emphasis on intersystems compatibility, increased research, better educa... View full abstract»

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  • Infrared Systems: I. Expressions for Signal and Background Induced Noise with Space Filters

    Publication Year: 1971 , Page(s): 27 - 33
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (777 KB)  

    The purpose of this paper is to investigate the signal from an IR detector in a system employing a moving space filter. The space filter may be a reticle or simply a "flying spot" aperture. When the IR detector output is caused by background radiation, the Wiener spectrum description is presumed adequate. The linear scanning case is considered in greater detail. A calculation of the detector outpu... View full abstract»

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  • Infrared Systems: I. Accuracy of Angle Measurement

    Publication Year: 1971 , Page(s): 34 - 41
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1397 KB)  

    In this paper expressions are derived for the error in position measurement for the problem of estimating the position of an infrared target in a random background and the combined prob lem when white detector noise is also affecting the estimation. Space filters performing linear scanning, nutation, and rotation are considered. A linear scanning infrared system is then considered in greater detai... View full abstract»

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  • Avionics for Aeronautical Systems

    Publication Year: 1971 , Page(s): 42 - 46
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1378 KB)  

    Advancements in technology have led to increased demand for avionics in airborne applications. Although aeronautical system suppliers have implemented improved procedures and design approaches which are generally effective, challenges continue to exist. This paper explores several areas where overall aeronautical system design might be improved by proper emphasis on avionic subsystem design. The t... View full abstract»

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  • Improvement of Automatic Landing Through the Use of a Space Diversity ILS Receiving System

    Publication Year: 1971 , Page(s): 47 - 53
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1595 KB)  

    A space diversity method of receiving and processing ILS localizer information has been developed and flight tested. Multiple lateral ly separated antennas are used which sense the ILS signal on and around the approach path. Combining these signals suppresses ILS beam distortion produced by multipath signal interference and provides much improved guidance information to the landing aircraft contro... View full abstract»

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  • LS Localizer Multipath Analysis

    Publication Year: 1971 , Page(s): 54 - 60
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1324 KB)  

    The scattering effect of structures on Instrument Landing System localizer signals is analyzed in this paper. A generalized computer program results which can be used to determine the reflection from surfaces of most materials and orientations for which the radius of curvature is large compared with the wavelength. For most reflecting walls, a closed form solution is used and the computation time ... View full abstract»

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  • A New Mathematical Formulation for Strapdown Inertial Navigation

    Publication Year: 1971 , Page(s): 61 - 66
    Cited by:  Papers (69)  |  Patents (13)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1214 KB)  

    A differential equation is developed for the orientation vector relating the body frame to a chosen reference frame. The time derivative of this vector is the sum of the inertially measurable angular velocity vector and of the inertially nonmeasurable noncommutativity rate vector. It is precisely this noncommutativity rate vector that causes the computational problems when numerically integrating ... View full abstract»

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  • Operating System Reliability for the Navy Advanced Avionic Digital Computer

    Publication Year: 1971 , Page(s): 67 - 72
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1372 KB)  

    This paper discusses reliability aspects of a modular multiprocessor currently under development by the Naval Air Systems Command. The operating system, or executive, of this computer may be implemented in various ways. These include a totally software "floating executive," one dedicated to a specific processor, or an executive consisting of special-purpose hardware. The objections to hardware exe... View full abstract»

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  • A Comparison of Numerical Methods for Solving Optimal Control Problems

    Publication Year: 1971 , Page(s): 73 - 78
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1164 KB)  

    Linear systems with quadratic performance criteria typically lead to two-point boundary value problems. The numerical solution of such problems is often difficult because of roundoff and truncation errors. In this paper numerical methods for digital computer solutions are considered for a system described by a given second-order linear differential equation and the results are compared. The result... View full abstract»

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  • Nonlinear Estimation Via Kalman Filtering

    Publication Year: 1971 , Page(s): 79 - 84
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1599 KB)  

    The extended Kalman-Bucy filtering algorithm is applied to the problem of estimating the system parameters of a single-channel missile attitude control system. In particular, noisy observations of body angular rate, normal acceleration, and control surface deflec tion are used in the algorithm to obtain estimates of body angular rate, angle of attack, control surface deflection, air density, and m... View full abstract»

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  • A Stratified Statistical Filter with Nonlinear Application

    Publication Year: 1971 , Page(s): 85 - 99
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3749 KB)  

    This paper introduces a statistical filter (or, more strictly, a filtering algorithm) which has intended application in the area of nonlinear systems. Within this context, the filter enables one to investigate the convergence effects produced by varying the initial estimates associated with the respective state variables, together with the various system parameters. The present algorithm is not in... View full abstract»

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  • Real-Time Tracking Filter Evaluation and Selection for Tactical Applications

    Publication Year: 1971 , Page(s): 100 - 110
    Cited by:  Papers (49)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2317 KB)  

    Five important tracking filters that are often candidates for implementation in systems that must track maneuvering vehicles are compared in terms of tracking accuracy and computer requirements for tactical applications. A rationale for selecting among these filters, which include a Kalman filter, a simplified Kalman filter, an ¿-ß filter, a Wiener filter, and a two-point extrapolator, is illust... View full abstract»

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  • Experimental Operation of a Multichannel Laser Communication Link

    Publication Year: 1971 , Page(s): 111 - 114
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (811 KB)  

    The results of more than a half-year of operation of a multichan nel laser link of telephone communication of 24 km length are given. The installations for carrying out some investigations of the properties of the atmospheric channel are briefly described. View full abstract»

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  • Investment Costs of Terrestrial Long-Haul Telecommunication Facilities

    Publication Year: 1971 , Page(s): 115 - 121
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2608 KB)  

    The investment costs of long-haul, modern, radio relay and coaxialcable systems, as determined from data submitted to the Federal Communications Commission, are presented. Formulas to determine costs per voice-circuit-mile, and per television-channel-mile, are developed. The specific facilities investigated are the TD-2, TD-3, and TH radio relay systems, and the L-3 12-tube and L-4 20-tube coaxial... View full abstract»

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  • The Effect of Multipath Reflections on Spaceborne Interferometer Accuracy

    Publication Year: 1971 , Page(s): 122 - 131
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1806 KB)  

    This paper presents a discussion of multipath disturbance of a satellite interferometer. A mathematical expression is developed, in which an upper bound of the error of the measured angle difference and position locations owing to multipath is expressed in terms of geometrical system parameters and the amplitude and phase of the multipath signal. Because diffuse reflection from a rough surface is ... View full abstract»

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  • The ESRO I Attitude Measurement System

    Publication Year: 1971 , Page(s): 132 - 141
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (5013 KB)  

    A system for measuring the attitude of a small scientific satellite is described. It consists of a magnetic aspect system and a solar aspect system, and has been flown successfully on two missions. The development was aimed at achieving maximum precision while observing the severe restrictions natural in a small satellite. The result is a set of instruments differing in several respects from previ... View full abstract»

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  • Performance Data for a Double-Threshold Detection Radar

    Publication Year: 1971 , Page(s): 142 - 146
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1062 KB)  

    A problem f requently encountered by radar systems analysts is the evaluation of the "double-threshold" or M out of N detection process. Detection probabilities of this process are binomially distributed, making it difficult to obtain exact results for large values of the number of samples and for low probabilities of false alarm. In this paper, the M out of N detection algorithm is defined and de... View full abstract»

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  • Fluctuating Target Detection in Clutter Using Sidelobe Blanking Logic

    Publication Year: 1971 , Page(s): 147 - 159
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1876 KB)  

    In an earlier paper, Maisel [6] considered two-channel detection systems using a sidelobe blanking logic when a nonfluctuating target was present. This paper is an extension of the earlier work to include fluctuating targets. The Swerling I, II, III, and IV models are considered when single-pulse detection is of interest. An adaptive threshold procedure is also briefly discussed whereby the probab... View full abstract»

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  • Complex Indicated Angles Applied to Unresolved Radar Targets and Multipath

    Publication Year: 1971 , Page(s): 160 - 170
    Cited by:  Papers (52)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2988 KB)  

    The off-axis angle indicated by a conventional monopulse radar is only the real part of a "complex indicated angle." The presence of unresolved targets or multipath distorts the real part (causing an erroneous angle indication) and also produces an imaginary part, which can easily be measured by processing the normally unused quadrature-phase component of the difference signal. Under certain condi... View full abstract»

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  • Radar Performance with Multipath Using the Complex Angle

    Publication Year: 1971 , Page(s): 171 - 178
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1494 KB)  

    The complex angle (CA) method for resolving a low angle target from its multipath signal is evaluated in the presence of system noise. It is shown that standard deviation improvements of around 3-to-1 can be achieved at a 20-dB signal-to-noise power ratio relative to a normal monopulse system without the CA. It is also shown that the CA method is unbiased, giving bias improvements of as much as 10... View full abstract»

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  • A Method for Radar Turbulence Detection

    Publication Year: 1971 , Page(s): 179 - 187
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2207 KB)  

    A method is described whereby a conventional non-Doppler radar may be used in the measurement and detection of atmospheric turbulence. The technique involves the measurement of the average echo power and the variance of the fluctuation spectrum in each of two separated pulse volumes, and corresponding measure ments of echo power and variance of the detected signals in a channel representing the pr... 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