NASA NTRS · 19810018948
USNO GPS program
Abstract
Initial test results indicated that the Global Positioning System/Time Transfer Unit (GPS/TTU) performed well within the + or - 100 nanosecond range required by the original system specification. Subsequent testing involved the verification of GPS time at the master control site via portable clocks and the acquisition and tracking of as many passes of the space vehicles currently in operation as possible. A description and discussion of the testing, system modifications, test results obtained, and an evaluation of both GPS and the GPS/TTU are presented.
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Putkovich, K.. 1981-03-01. USNO GPS program. https://ntrs.nasa.gov/citations/19810018948
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