[time-nuts] IEEE Spectrum - Dec 2017 - article on chip-scale atomic frequency reference

Mark Sims holrum at hotmail.com
Sat Dec 9 19:49:50 EST 2017


Yep, to paraphrase Bunker Hunt's "a billion dollars ain't what it used to be"... a nanosecond (or picosecond) ain't what it used to be.  Things that used to be insignificant n'th order theoretical nuisances are now very real significant problems.

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> But it's not one-to-one as you suggest. A 1 meter change in elevation corresponds to a frequency offset of about 1e-16. So for 1e-18 levels of performance you "only" need to know g, or your elevation to 1 cm accuracy.


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