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Re^6: Converting GPS seconds to readable time&date (agreement)

by tye (Sage)
on Jan 11, 2009 at 22:32 UTC ( [id://735570]=note: print w/replies, xml ) Need Help??


in reply to Re^5: Converting GPS seconds to readable time&date
in thread Converting GPS seconds to readable time&date

Indeed. At my prior company, they use GPS clocks for controlling the signalling on their digital networks, which means they expect the time to be accurate so that they can send 1.5 million bits per second and not have to "slip" any bits, which means they expect accuracy on the order of 1 microsecond (and searches show 0.5..1 microsecond accuracy for GPS-based clocks). But that is more about frequency accuracy than about agreement with UTC.

Some results agree with 10 microsecond accuracy vs UTC. Turning on my GPS (which I hadn't used recently) showed it quite at odds vs my WWV clock. Going to the window so it could sync up with satelites got it to agree with my WWV clock to within a small fraction of a second (just holding them next to each other so I could watch the seconds displayed click along in perfect sync as far as my eyes could tell).

So, yes, GPS units display accurate "human" time (usually in your selected timezone, not just UTC), not something that is 20 seconds "off" nor something only accurate to within several seconds.

- tye        

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