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Military Electronics, IEEE Transactions on

Issue 1 • Date Jan. 1964

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Displaying Results 1 - 13 of 13
  • [Front cover]

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

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

    Publication Year: 1964 , Page(s): 1
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  • Editorial . . .

    Publication Year: 1964 , Page(s): 2
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  • Pulsed Helium-Neon Gas Laser Applications

    Publication Year: 1964 , Page(s): 3 - 12
    Cited by:  Papers (1)
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    The pulsed helium-neon gas laser has provided pulse power more than three orders of magnitude above the average power afforded by CW operation. Analyses of the power-limiting factors show that still greater increases may be expected. By increasing the size of the laser tube several times, by optimizing the gas ratio and pressure, by optimizing reflectivity and transmissivity of the reflecting mirrors, and by controlling the shape and application of the exciting voltage pulse, peak power outputs in the kilowatt range are theoretically possible. A power of 100 watts has been achieved in the laboratory at pulse rates up to 250 cps. Such a result brings the gas laser out of the low power category and into the intermediate power range. The results of range calculations show that 100 w pulse power will provide a radar range of approximately 10 km against a target having a diffuse reflectivity of 0.1, and a range of over 100 km with a cooperative target. Against a bright cloud background only the cooperative target can be used. The range will then be reduced to approximately 20 km. An automatic tracking radar system has been synthesized utilizing the pulsed gas laser as a transmitting component. A brief parametric analysis has beem made and some of the advantages of the optical radar over its microwave counterpart have been outlined. View full abstract»

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  • The Spinning Reflector Technique for Ruby Laser Pulse Control

    Publication Year: 1964 , Page(s): 13 - 21
    Cited by:  Papers (4)
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    A method of obtaining high peak power pulses from a ruby laser oscillator by controlling the resonant cavity Q with a spinning reflector technique is described. Basic principles are discussed. A theory regarding the multiple pulse problem of slow Q switching is presented. Practical methods of eliminating critical alignment procedures and increasing effective switching speed are explained. Experimental data relating to the effect of the parameters of cavity output transmission, crystal temperature, pump energy, reflector separation and spinning speed upon laser power and energy are presented. Results of experiments at temperatures ranging from -20°F to 140°F are given. Application of the spinning reflector technique to optical ranging is discussed. Described is an experimental rangefinder designed and fabricated to show feasibility of the technique for military application. View full abstract»

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  • Analysis and Optimization of Laser Ranging Techniques

    Publication Year: 1964 , Page(s): 22 - 28
    Cited by:  Papers (4)
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    The general criteria for the operational performance of laser ranging systems are considered in quantitative terms with emphasis being placed on the optimization of systems which must meet specific operational requirements. The entire range-determining process is discussed on a statistical basis and the target detection capabilities of a system are defined in terms of the relative probabilities of recording real and false targets. Within this analysis appears a detailed discussion of all contributing noise sources, these being reduced to a fundamental noise source for two specific systems which transmit at different frequencies. A comparison is then made between the relative power requirements of the two systems performing the same task. In the case of some pulsed gas lasers, the pulse duration is somewhat long, thus necessitating a compromise between range resolution and maximum range capability. The relationship between these parameters is discussed in detail. In addition, a technique is proposed whereby the resolution is varied as a function of target return. This technique employs a multiple pulse transmitter and automatically optimizes its resolution and range capabilities. View full abstract»

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  • On the Narrow Beam Communication System Acquisition Problem

    Publication Year: 1964 , Page(s): 28 - 39
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    It is desired to establish a communication link between two separated transmit-receive terminals, each having narrow beamwidths and specified uncertainty as to relative angular locations. To achieve the communication link the narrow beams must point directly at each other. The purpose of this paper is to determine the search or acquisition time required by the two terminals to achieve the desired state of knowledge whereby the transmit-receive beams of both terminals are pointed in the required directions, signals are mutually recognized and the communication link is thereby established. The acquisition time is a random variable and can thus be described in terms of an expected value and standard deviation. Markov chain concepts are employed to derive equations for the expected acquisition time in terms of system parameters such as relative angular uncertainty, beamwidth, probability of detection of a signal in noise, false alarm probability, etc. Single as well as multiple receive beam systems are considered. Curves relating the expected acquisition time to probability of detection and pointing probability are presented. View full abstract»

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  • The Accuracy of Maximum Likelihood Angle Estimates in Radar and Sonar

    Publication Year: 1964 , Page(s): 39 - 45
    Cited by:  Papers (14)
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    By extending the results of Kelly, Reed, and Root, formulas are derived for the variances of maximum likelihood estimates of azimuth, and azimuth and elevation, jointly, by dense, discrete and discrete-continuous apertures for the strong signal case. The accuracy of angle measurements depends upon 1) total signal energy captured by the aperture, 2) the mean-square aperture size, 3) carrier frequency, 4) the mean-square signal bandwidth. Mean-square quantities are the second moments about the centroids. The actual signal form and aperture form do not matter, except as they affect the mean-square quantities. When joint estimates of azimuth and elevation are made, the errors are generally coupled. Minimum variances are obtained when the errors are uncoupled. This condition is obtained, in the narrowband case, when the two-dimensional illumination function is factorable into the product of one-dimensional functions. The formulas for the dense and discrete apertures are identical in form, the various factors being discrete or continuous analogs of one another in which integrations are replaced by summations. The formulas for the discrete-continuous array differs in form by the presence of terms which reflect the anisotropy of the beam patterns. View full abstract»

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  • Contributors

    Publication Year: 1964 , Page(s): 46 - 47
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  • Information for authors

    Publication Year: 1964 , Page(s): 47a
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  • Publication schedule

    Publication Year: 1964 , Page(s): 47a
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  • Institutional listings

    Publication Year: 1964 , Page(s): 47b
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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