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Position surveillance using one active ranging satellite and time-of-arrival of a signal from an independent satellitePosition surveillance using one active ranging/communication satellite and the time-of-arrival of signals from an independent satellite was shown to be feasible and practical. A towboat on the Mississippi River was equipped with a tone-code ranging transponder and a receiver tuned to the timing signals of the GOES satellite. A similar transponder was located at the office of the towing company. Tone-code ranging interrogations were transmitted from the General Electric Earth Station Laboratory through ATS-6 to the towboat and to the ground truth transponder office. Their automatic responses included digital transmissions of time-of-arrival measurements derived from the GOES signals. The Earth Station Laboratory determined ranges from the satellites to the towboat and computed position fixes. The ATS-6 lines-of-position were more precise than 0.1 NMi, 1 sigma, and the GOES lines-of-position were more precise than 1.6 NMi, 1 sigma. High quality voice communications were accomplished with the transponders using a nondirectional antenna on the towboat. The simple and effective surveillance technique merits further evaluation using operational maritime satellites.
Document ID
19810011619
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
January 1, 1980
Subject Category
LAUNCH VEHICLES AND SPACE VEHICLES
Report/Patent Number
NASA-CR-166647
SRD-80-050
Funding Number(s)
CONTRACT_GRANT: NAS5-25135
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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