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Space Electronics and Telemetry, IEEE Transactions on

Issue 3 • Date Sept. 1964

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Displaying Results 1 - 12 of 12
  • 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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  • Analog-to-Digital Conversion by Means of Delta Modulation

    Publication Year: 1964 , Page(s): 87 - 90
    Cited by:  Papers (3)
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    It is shown that normal delta modulation can be used for the transmission of dc signals. A circuit is described in which a delta modulator is combined with a counter for analog-to-digital conversion of a dc signal. Several factors contributing to the accuracy are developed. One of these factors which has not been dealt with previously is the size of the steps in the reconstructed signal due to the finite integrator time constant. Two examples of delta modulators are described; one of them a high precision system, the other a simple design of moderate precision. View full abstract»

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  • Factors Affecting the Threshold of Feedback FM Detectors

    Publication Year: 1964 , Page(s): 90 - 94
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    A signal dependent threshold condition is often observed in feedback FM detectors. It is shown in this paper that this is due to the shape of the discriminator characteristic, and that in general a great deal of care is needed in discriminator design in order to reduce this effect. View full abstract»

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  • Optimum Coherent Phase and Frequency Demodulation of a Class of Modulating Spectra

    Publication Year: 1964 , Page(s): 95 - 102
    Cited by:  Papers (16)
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    The optimum phase-locked loop demodulator is obtained for a carrier, phase modulated by a stationary Gaussian modulating process whose spectrum is proportional to 1/1 + (f/B)2n where n is any positive integer. Results are obtained also when the carrier is frequency modulated by the process for the limiting cases n = 1 and as n approaches infinity. It is shown that for phase modulation the output SNR as a function of the channel SNR in the bandwidth B varies from linear to exponential behavior as n increases from 1 to ¿. For the limiting cases the performance of frequency modulation is slightly inferior to that for phase modulation. View full abstract»

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  • A Nonblocking Switching System for Programmed Telemetry Control

    Publication Year: 1964 , Page(s): 102 - 110
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    Manual patching of large quantities of circuits requires considerable time, and is difficult to verify and awkward to change. The system described herein is an automatic patchboard capable of making 480 (or less) connections rapidly. Connections are made between two-wire inlets and outlets in any combination, and are controlled from a preprogrammed punched tape or from manual operation of a keyset on a control console. By departing from standard straight forward techniques in switching and control, a reliable nonblocking automatic patchboard became economically feasible. View full abstract»

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  • Telemetry Error Measurements Using Pseudo-Random Signals

    Publication Year: 1964 , Page(s): 111 - 115
    Cited by:  Papers (4)
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    Conventional methods of measuring wide-band data error in continuous telemetry systems use shaped random noise to simulate the signal. This article describes the advantages of using discrete pseudo-random signals for this application. Results for a typical frequency-division telemetry system are presented. View full abstract»

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  • Radio Interferometer Phase-Channel Combiner Mod. II for the Navy Space Surveillance System

    Publication Year: 1964 , Page(s): 116 - 123
    Cited by:  Papers (2)
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    The Space Surveillance System developed at the U. S. Naval Research Laboratory, Washington, D. C., for the detection of earth satellites forms a fence across the southern part of the United States. Four receiving sites are alternated with three transmitting sites which illuminate satellites with radio energy as they traverse the fence. The angle of arrival of the reflected energy is measured at each receiving station by a compound radio interferometer. These signals yield a multiplicity of channels which are normally recorded on paper, read and resolved by using slide rules and/or mathematical tables. Operationally the resolution is done by a computer. With the increasing satellite population the number of fence crossings has increased considerably. Automation in the detection process is needed to facilitate identification and sorting of satellites from each other if a large backlog of data is to be avoided. The purpose of this report is to describe an electronic system which automatically combines several noisy ambiguous radio interferometer phase channels into one unambiguous quiet channel. This technique results in that given a multi-baseline radio interferometer system, normally having high angular resolution capability accompanied with the usual interferometer ambiguity problem associated with deciphering the multiple phase signal outputs it can be instrumented directly into a single unambiguous signal output which has an accuracy and resolution proportional to the longest baseline in the interferometer and whose noise content is inversely proportional to this baseline. View full abstract»

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  • Noise in Digital-to-Analog Conversion Due to Bit Errors

    Publication Year: 1964 , Page(s): 124
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  • Comment on "Distortion of Multitone FM Signals Due to Phase Nonlinearity"

    Publication Year: 1964 , Page(s): 125
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  • Contributors

    Publication Year: 1964 , Page(s): 126 - 127
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  • Institutional listings

    Publication Year: 1964 , Page(s): 127a
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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