A Comparison of the Highest Precision Commonly Available Time Transfer Methods: TWSTT and GPS CV
NAVAL OBSERVATORY WASHINGTON DC TIME SERVICE DIV
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The U.S. Naval Observatory USNO in Washington, D.C., is now operating its Alternate Master Clock AMC, located at Falcon Air Force Base, Colorado. UTCUSNO-UTCAMC is determined independently by the Global Positioning System GPS common view CV and the Two-Way Satellite Time Transfer TWSTT method. The GPS CV time transfer data are joined from strict 13- minute common-view tracks. The TWSTT data are single 5-minute runs taken once every hour. In this study, the performances of the GPS CV time transfers from Standard Positioning Service SPS CIA code single-channel receivers using the modeled ionosphere, Precise Positioning Service PPS dual-frequency receivers using the measured ionosphere, and TWSTT are compared.
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