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Satellite-aided mobile communications limited operational test in the trucking industryAn experiment with NASA's ATS-6 satellite, that demonstrates the practicality of satellite-aided land mobile communications is described. Satellite communications equipment for the experiment was designed so that it would be no more expensive, when mass produced, than conventional two-way mobile radio equipment. It embodied the operational features and convenience of present day mobile radios. Vehicle antennas 75 cm tall and 2 cm in diameter provided good commercial quality signals to and from trucks and jeeps. Operational applicability and usage data were gathered by installing the radio equipment in five long-haul tractor-trailer trucks and two Air Force search and rescue jeeps. Channel occupancy rates are reported. Air Force personnel found the satellite radio system extremely valuable in their search and rescue mission during maneuvers and actual rescue operations. Propagation data is subjectively analyzed and over 4 hours of random data is categorized and graded as to signal quality on a second by second basis. Trends in different topographic regions are reported. An overall communications reliability of 93% was observed despite low satellite elevation angles ranging from 9 to 24 degrees.
Document ID
19810011809
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Anderson, R. E. (General Electric Co. Schenectady, NY, United States)
Frey, R. L. (General Electric Co. Schenectady, NY, United States)
Lewis, J. R. (General Electric Co. Schenectady, NY, United States)
Date Acquired
September 4, 2013
Publication Date
July 1, 1980
Subject Category
Communications And Radar
Report/Patent Number
SRD-81-005
NASA-CR-166658
Accession Number
81N20337
Funding Number(s)
CONTRACT_GRANT: NAS5-24365
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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