NDLI: A Delayed-Repeater Satellite Communication System of Advanced Design

Content Provider	IEEE Xplore Digital Library
Author	Mottley, T. P. Marx, D. H. Teetsel, W. P.
Copyright Year	1959
Abstract	This paper describes a delayed-repeater satellite communications system consisting of an orbiting delayed-repeater radio-relay station which passes over terminal ground stations located within the viewing area of the satellite. Messages are exchanged between the satellite and a ground station operating in the 2-kmc band utilizing both polarization and frequency diversity techniques to provide a continuous transmission circuit regardless of the satellite attitude. Data storage in the satellite is accomplished by the use of newly-developed magnetic tape recorders. Signals in the band near 108 mc provide telemetry and command control functions. The telemetry used is a modified standard FM/FM system, while the command control circuit enables selection of satellite control functions. Power for the satellite electronics is derived from solar energy using solar cells which charge nickel-cadmium batteries. Each of the ground stations consists of radio transmitting and receiving equipment and an automatic-tracking 28-foot-diameter parabolic antenna. Each station will acquire the satellite and track it during a pass over a station. Data from the satellite are transmitted (tape loading) to the ground station upon command. Simultaneously, data for the other. two stations are transmitted to the satellite (tape unloading) from the ground station. Message sorting in the satellite is accomplished by use of the appropriate tape recorders, which in turn are activated by ground commands. In the ground stations, teletype messages on paper tape are converted to a serial pulse train at a 50-kilobit-per-second rate by a paper-tape reader and a magnetic recorder-reproducer.
Starting Page	195
Ending Page	207
Page Count	13
File Size	2975647
File Format	PDF
ISSN	00962511
Volume Number	MIL-4
Issue Number	2-3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1960-01-01
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delay systems Satellite communication Satellite broadcasting Satellite ground stations Circuits Telemetry Automatic control Control systems Artificial satellites Polarization
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Aerospace Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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