3 ms·
The GPS broadcast navigation message includes the offset between GPS system time and UTC, which is specified to be an integer number of seconds plus or minus a
by piannucci 8y ago
The GPS broadcast navigation message includes the offset between GPS system time and UTC, which is specified to be an integer number of seconds plus or minus a microsecond. The integers are the running total number of leap seconds since 1980. GPS system time doesn't perform leap seconds, but the clock offsets are calculated so that the system tracks UTC. So I am not certain what you mean.
- FabHK 8y agoI don't understand the downvotes of the poster above correctly highlighting that GPS does not use UTC. GPS does not use UTC, it uses GPS time [1], which is at a constant offset to International Atomic Time, TAI [2], which was in sync back in 1958 with Universal Time [3], on which UTC is based. GPS, TAI, and UTC use SI seconds, while UT1 doesn't (a UT1 second is 1/86400 of a complete rotation of earth). Of course they are all related, but, hey, all time scales are somewhat related and "track each other", given some (time-dependent) offset. Fact is that GPS doesn't run on UTC. [1] https://en.wikipedia.org/wiki/Global_Positioning_System#Leap_seconds https://en.wikipedia.org/wiki/Global_Positioning_System#Leap... [2] https://en.wikipedia.org/wiki/International_Atomic_Time https://en.wikipedia.org/wiki/International_Atomic_Time [3] https://en.wikipedia.org/wiki/Universal_Time https://en.wikipedia.org/wiki/Universal_Time