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Aerospace and Navigational Electronics, IEEE Transactions on

Issue 2 • Date June 1964

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Displaying Results 1 - 18 of 18
  • IEEE Transactions on Aerospace and Navigational Electronics

    Publication Year: 1964 , Page(s): c1
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  • IEEE Professional Technical Group on Aerospace and Navigational Electronics

    Publication Year: 1964 , Page(s): c2
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  • Table of contents

    Publication Year: 1964 , Page(s): 79
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  • Ernst L. Kramar Pioneer Award 1964

    Publication Year: 1964 , Page(s): 80 - 85
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  • Calculation of the Detection Probability for a Statistically Located Target

    Publication Year: 1964 , Page(s): 86 - 91
    Cited by:  Papers (1)
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    This paper presents a method of computing the cumulative probability of detection of a statistically located target. The method is completely analytic and is based on a very simple model. The curve which relates the single scan probability of detection to the target-interceptor range is replaced by the function which is 1.0 up to some critical range and 0 thereafter. The critical range is that value which results in equal areas under the two curves. A factor AR is calculated which depends on scan angle, closing velocity and scan time, and which approximates the decrease in effective range due to nonzero scan time and closing velocity. Finally, a cumulative probability of detection is calculated using an assumed target distribution. An ¿exact¿ evaluation via a digital computer takes into account the actual single scan detection probability (as a function of range), the effect of multiple scans, flyback time, scan time variation with angle, and closing velocity as well as the target distribution. A comparison of the results obtained by the two methods show the simple analytical model to be sufficiently accurate for all but the most exacting analyses. View full abstract»

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  • The Attainable Range Accuracy with a Tapped Delay Line Estimator

    Publication Year: 1964 , Page(s): 92 - 96
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    A theoretical expression is derived for the radar range accuracy attainable with an N-tapped delay line estimator. It is found that the range accuracy is a function of the signal-to-noise ratio and the number of taps. In the limiting case, as the number of taps approaches infinity, it is shown that the accuracy expression agrees with the ultimate attainable accuracy for a bandwidth-limited rectangular pulse. The results of a computer simulation of the delay line estimator scheme with two, six, and ten taps are reported and compared with the theory. View full abstract»

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  • Error Distributions of Best Estimate of Position from Multiple Time Difference Hyperbolic Networks

    Publication Year: 1964 , Page(s): 96 - 100
    Cited by:  Papers (9)
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    A mathematical model for the error distribution of the best estimate of position of a vehicle as determined from a set of simultaneous measurements of times of arrival of electromagnetic waves from an arbitrary number of ground stations is obtained. The major and minor axes of the error ellipse, as well as the angle that they make with the assumed axes, are determined. The results are in such form as to be easily adaptable for use with a computer. View full abstract»

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  • Inaccuracies in Doppler Radar Navigation Systems Due to Terrain Directivity Efects, Nonzero Beamwidths and Eclipsing

    Publication Year: 1964 , Page(s): 101 - 111
    Cited by:  Papers (2)
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    A study is made of inaccuracies due to environmental beam-distorting effects in precision Doppler radar navigation systems and specifically of ¿interrupted continuous wave¿ (ICW) Doppler systems which simultaneously determine altitude and velocity by the employment of several beams, all of them produced by a single transmitter. The three causes of errors considered include terrain directivity (back-scattered power varying with angle of incidence); range effects (power backscattered by individual infinitesimal patches of terrain varying as R-4, where the range R is not constant over the area illutminated by any single beam); and nonconstant eclipsing [the degree of eclipsing of the energy arriving from any direction varying as a function of the angles (¿, ¿) specifying the direction]. All of these effects tend to cause the ¿effective¿ Doppler frequency fTj6 indicated by the jth tracker to be different from the frequency fTj0 corresponding to zero beamwidth [i.e., fTj0 = -(2/¿)(V · bj0) where bj0 is the unit vector along the beam axis]. A related cause of inaccuracy is the noise-like character of the return, caused in part by the nonzero bandwidth BJ of the Doppler spectrum corresponding to beam #j (the Doppler frequency of the return from any direction varying as a function of the angles ¿, ¿). Formulas, in the form of integrals, are derived for fTj6 and Bj. The velocity components Va1, Va2, Va3 relative to antenna axes, or any other convenient set, are linear combinations of the effective tracker frequencies, begin{equation*} V_ai = sum_{i} C_{ij}{f_{Ti}}^e. View full abstract»

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  • A Settling Time Constrained Optimization of a Velocity Inertial Navigation System

    Publication Year: 1964 , Page(s): 112 - 117
    Cited by:  Papers (1)
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    In this paper, a description of a technique for improving transient performance in the velocity inertial system while minimizing the standard deviation of the system error, (i.e., standard deviation of the system velocity measurement error ¿v2) is given. To accomplish this objective, a prescribed settling time constraint is formulated for the system response. The constraint equation is then imposed on the minimization process. The result shows that considerable settling time improvement can be derived without sacrificing system accuracy. View full abstract»

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  • Torque on a Spinning Hollow Sphere in a Uniform Magnetic Field

    Publication Year: 1964 , Page(s): 118 - 122
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    The torque on a spinning spherical conducting shell of arbitrary thickness in a uniform magnetic field is calculated in terms of the magnetic vector potential. The torque is found to result from the interaction of eddy currents induced in the shell with the excitation field and is such as to oppose and precess the spinning of the shell. View full abstract»

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  • Torque on a Spinning Hollow Sphere in a Uniform Alternating Magnetic Field

    Publication Year: 1964 , Page(s): 122 - 127
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    The calculation of torque acting on a spinning spherical shell in a uniform stationary magnetic field first presented by Halverson and Cohen1 is extended to include the alternating magnetic field case. The torque is found under certain conditions to be positive and will increase the sphere's angular velocity up to a stable equilibrium condition at which point the torque changes sign. Differential equations are solved in terms of the magnetic vector potential which is used to calculate the induced eddy currents and resultant magnetic field. A complete solution is given for the solid sphere while approximations are used to obtain a thin shell solution. View full abstract»

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  • Correction [to "An improved ground beacon antenna"]

    Publication Year: 1964 , Page(s): 127
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    Summary form only given, as follows. A.R. Giddis and R.B. Barrar, authors of "An Improved Ground Beacon Antenna," which appeared on pp. 315-323 of the December, 1963, issue of these Transactions, have called the following to the attention of the Editor: 1) The argument of the J9 function in the second term of (6), on page 318, should be enclosed with an "open" parenthesis, i.e., J9(kd9). 2) The lower angular limit of the upper exponential function in (17), on page 320, should read θ1, i.e., θl is greater than or equal to θ is greater than or equal to θ0. The sense of the presentation is not compromised by these errors which should become evident to the reader. View full abstract»

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  • Symbolic Representation of Coordinate Transformations

    Publication Year: 1964 , Page(s): 128 - 134
    Cited by:  Papers (2)
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    An analytical technique using a symbolic representation of the coordinate transformation for a rotation of axes is presented. The representation has the advantages of a signal flow diagram and yet retains the properties of a transformation matrix. A sign convention and the characteristics of the symbolic representation are defined. Examples are given which illustrate application of the technique to several typical problems encountered with rotating coordinate systems. View full abstract»

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  • Abstracts

    Publication Year: 1964 , Page(s): 134 - 135
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  • Contributors

    Publication Year: 1964 , Page(s): 136 - 138
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  • IEEE Transactions on Aerospace and Navigational Electronics

    Publication Year: 1964 , Page(s): 138
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  • Suggestions to authors

    Publication Year: 1964 , Page(s): 138a
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  • Institutional listings

    Publication Year: 1964 , Page(s): 138b
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Aims & Scope

This Transactions ceased publication in 1965. The new retitled publication is IEEE Transactions on Aerospace and Electronic Systems.

Full Aims & Scope