UTC, GPS time and Tai

Global positioning system (GPS) Time is from 1980 year 1 month 6 Midnight （0 Hours 0 branch 0 second ） The continuous measurement time of an era beginning with the world coordination time . GPS Time usually takes this GPS The number of weeks and seconds of a time era are expressed in units . GPS Time does not introduce leap seconds , So it's a few seconds ahead of coordinated universal time .
•UTC, World coordinated time , Commonly known as Greenwich mean time （GMT）.
•GPS time, GPS time , It is realized by atomic clock , Clock in GPS ground control station and GPS satellite .
•TAI, namely Temps Atomique International, The international atomic time scale based on continuous counting in the international system of units .

because GPS and TAI Time has no leap seconds , So whenever you insert a leap second , They will be relative to UTC Change for a second .GPS The time scale of time and world coordinated time is 1980 year 1 month 6 Japan GPS The time is consistent at the beginning .1958 year 1 month 1 The day begins ,TAI Time and UTC Consistent time scale .

notes -GPS and TAI Ahead of UTC Time , As shown below ：

World coordinated time （ When coordinating ）

World harmony is an international 、 A highly accurate and stable unified atomic time system , By offset , With the US Naval Observatory (USNO) The general time of the seasonal change correction of the maintained earth's rotation rate remains very close .

GPS Time

GPS Time reference USNO The master clock of (MC), And be guided to the coordinated universal time system time .GPS Time and UTC Time is directly related .UTC - GPS= second .2012 The time difference of years is 16 second .GPS Time does not include leap seconds .GPS Time and UTC The difference between time is included in the data transmitted in the navigation information .
GPS Time is defined in weeks and seconds （ week ）. Current GPS Weekly calendar from 1999 year 8 month 22 Sunday, Sunday （ Saturday , The middle of the night ） From zero o'clock . The GPS calendar can be widely used on the Internet .
GPS The equivalent time is in seconds