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Space Electronics and Telemetry, IEEE Transactions on

Issue 4 • Date Dec. 1964

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Displaying Results 1 - 10 of 10
  • Table of contents

    Publication Year: 1964 , Page(s): c1
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  • IEEE Space Electronics and Telemetry Group

    Publication Year: 1964 , Page(s): c2
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  • The Effect of Tape Transport Flutter on Spectrum and Correlation Analysis

    Publication Year: 1964 , Page(s): 129 - 134
    Cited by:  Papers (3)
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    The extraction of spectral density and correlation functions from vibration and acoustic signals, etc., has been undergoing a continuing process of refinement. This refinement has been brought about by more and more stringent analysis requirements. The design of improved analyzers to meet such requirements has been going on concurrently. Usually the signals to be analyzed are played back from magnetic tape recorders. The flutter of the tape transports involved can degrade or effectively destroy such possible desired parameters as high resolution, high dynamic range, extreme accuracy of analysis, etc., for either spectral density or correlation function plots. Formulae are developed to show how both sinusoidal and random components of flutter introduce error into the analysis, and to indicate how flutter limits the range of useable values of spectral resolution, correlation time-delay, etc. The pertinent features of a tape transport, the influential characteristics of its flutter, etc., are also discussed. Suggestions are also given regarding the interpretation of the data on transport flutter that is usually available. View full abstract»

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  • Minimum-Error Probabilities in Demodulation of Binary PCM Signals

    Publication Year: 1964 , Page(s): 135 - 143
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    For ordinary binary PCM waveforms, the minimum-error probability demodulation operation is determined when decisions are made one-word-at-a-time utilizing an arbitrary number, n, of statistically dependent, received, noisy words. A method is then developed for simulating the minimum-error demodulation with a digital computer for the case of additive white Gaussian noise. By a Monte Carlo technique, minimum-error probabilities are computed for Gaussian data for n = 2 and n = 1, and for 3-bit and 6-bit words. The results are applicable regardless of the waveforms used to represent the binary digits (or bits). These results indicate that for word-error probabilities less than about 0.1, no very significant power gains accrue from the use of statistical dependence in the data unless the correlation coefficients between data samples are large (i.e., 0.98 or greater) for a large number of transmitted samples. However, the results also indicate that the effect of using the statistical dependence in the data is to reduce errors in the high order (most significant) bits of the code. Hence, significant gains might be obtained if an error amplitude criterion were used rather than error probability. View full abstract»

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  • An Experimental Photo-Tape Slit Camera System

    Publication Year: 1964 , Page(s): 144 - 153
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    The basic principles and advantages of recording and storing optical images in the form of equivalent electrical charge patterns on a special kind of flexible tape are presented. An experimental model of a slit-type camera system is described which was designed to demonstrate the feasibility of this method of recording. This type of camera system is particularly well suited to the recording of images of the earth's cloud cover from an orbiting satellite. Storing these images temporarily and reading them out in the form of a video signal when the satellite is near a ground station completes a cycle of operations. Results of preliminary tests are reported which verify the validity of the basic concepts involved in this kind of video recording system. View full abstract»

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  • Magnetic Fields near Twisted Wires

    Publication Year: 1964 , Page(s): 154 - 158
    Cited by:  Papers (13)  |  Patents (1)
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    Formulas are given for the field near twisted leads carrying equal and opposite direct currents, and results are plotted in dimensionless form for various cases. At some points twisting the wires is shown to strengthen rather than weaken the field. View full abstract»

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  • Multiple Access to a Hard-Limiting Communication-Satellite Repeater

    Publication Year: 1964 , Page(s): 159 - 167
    Cited by:  Papers (23)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1539 KB)  

    This paper analyzes the communication capability of a hard-limiting satellite repeater when spread-spectrum signals are used for asynchronous access multiplexing. It derives formal results which indicate the most suitable system bandwidth and the resulting maximum number of simultaneous users as a function of the ratio of the received signal power (over the entire system bandwidth) from the satellite to the available noise power density at the ground station receiver. Equally important, the paper sets forth the assumptions and approximations necessary to achieve the formal results and examines their weaknesses. View full abstract»

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  • Comment on "Design of a Digital Notch Filter with Tracking Requirements"

    Publication Year: 1964 , Page(s): 168
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  • Contributors

    Publication Year: 1964 , Page(s): 169
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  • Index to IEEE Transactions on Space Electronics and Telemetry

    Publication Year: 1964 , Page(s): 1 - 5
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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