Accuracy of International Time and Frequency Comparisons via Global Positioning System Satellites in Common-View

Abstract

Abstract-Frequency differences between major national timing centers are being resolved with uncertainty of less than 1 part in 1014',using satellites of the Global Positioning System (GPS) in common-view. Portable clock and GPS time differences are in excellent agreement. Around the world GPS measurement between three laboratories had a time residual of 5.1 ns.

NIST time and frequency bulletin

“…Positive leap seconds, beginning at 23 h 59 min 60 s UTC and ending at 0 h 0 min 0 s UTC, were inserted in the UTC time scale on 30 June 1972, 1981-1983, 1985, 1992-1994, 1997, 2012, 2015and on 31 December 1972-1979, 1987, 1989, 1990,1995, 1998, 2008.…”

NIST time and frequency bulletin

“…Positive leap seconds, beginning at 23 h 59 min 60 s UTC and ending at 0 h 0 min 0 s UTC, w ere inserted in the UTC time scale on 30 June 1972, 1981-1983, 1985, 1992-1994, 1997, 2012, 2015and on 31 December 1972-1979, 1987, 1989, 1990,1995, 1998, 2008 The use of leap seconds ensures that UT1 -UTC w ill alw ays be held w it hin ±0.9 s. The current value of UT1 -UTC is called the DUT1 correction. DUT1 corrections are broadcast by WWV, WWVH, WWVB, and ACTS and are printed below .…”

NIST time and frequency bulletin

“…Positive leap seconds, beginning at 23 h 59 min 60 s UTC and ending at 0 h 0 min 0 s UTC, w ere inserted in the UTC time scale on 30 June 1972, 1981-1983, 1985, 1992-1994, 1997, 2012, 2015and on 31 December 1972-1979, 1987, 1989, 1990,1995, 1998, 2008 The use of leap seconds ensures that UT1 -UTC w ill alw ays be held w ithin ±0.9 s. The current value of UT1 -UTC is called the DUT1 correction. DUT1 corrections are broadcast by WWV, WWVH, WWVB, and ACTS and are printed below .…”