Where are you in the world? An ordinary wristwatch can maintain that kind of accuracy over the long term, then there's WWV, and in the US, they keep the line freq. synced up so good that clocks can go for years without losing a second.
Of course, if this is just an exercise in GPS, then I'm out of the loop. )-;
Good Luck! Rich
within 1 mS? Some *ordinary* watch.
Just assume the quartz crystal can maintain 1ppm through temperature variations (on or off the wrist). That's 83mS per day. To achieve 1mS over 1 day (ignoring jitter) would require ~12*10^-9 oscillator performance. Stunning.
(assuming my maths are OK at this time of day)
yes
Indeed they do - but by counting cycles. Short term it would never be able to be within 1mS.
Without a very stable frequency reference locked to some time standard, 1mS would be hard to achieve. GPS provides his best (and likely most affordable) solution.
Tony (remove the "_" to reply by email)
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