The flying clock tests were closed loop (I think there's a more accurate
term for the process) where the clock, including both its initial time
error and its frequency offset (rate difference from USNO or NIST), was
well characterized via radio and against a set of similar clocks prior
to take-off. At the end of the trip, the clock was measured again. The
time difference between departure and arrival was proportionally applied
to the measurements taken along the way. e.g., if the clock was known
to be 10ns/day fast during the trip, you adjust a measurement made on
the 3rd day by 30ns. There were lots of additional statistics applied
to improve the measurement results.
John
Thanks, John. Was the measurement down to the nanosecond level?
Cheers,
David
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