Yo Tom! On Tue, 2 Jan 2024 06:44:01 -0800 Tom Van Baak <t...@leapsecond.com> wrote:
> Can you give some references to your observation? I don't recall > seeing UT1 mentioned in the first couple of decades of GPS > documentation. The system runs on GPS time, the WGS84 coordinate > system, broadcast ephemeris including SV clock corrections. Where > does UT1 appear in those? From the IS-200M: 30.3.3.5.1.1 User Algorithm for Application of the EOP. "For UT1, Table 30-VIII documents the relationship between GPS time and UT1 with ΔUTGPS and ΔU̇ TGPS. Users who may need ΔUT1 (UT1-UTC) as detailed in Chapter 5 of IERS Technical Note 36: IERS Conventions (2010) can calculate this parameter from UT1-UTC, or more accurately as (UT1-GPS) + (GPS-UTC), using intermediate quantities (UT1-GPS) and (GPS-UTC) which are produced during calculation of UT1 and UTC. r RGDS GARY --------------------------------------------------------------------------- Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 g...@rellim.com Tel:+1 541 382 8588 Veritas liberabit vos. -- Quid est veritas? "If you can't measure it, you can't improve it." - Lord Kelvin
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