Hello Martyn,
This is exactly the problem that all the national time services have
trying to formulate UTC (USNO, NIST, GPS, BIPM, and all the other
contributors). There are a number of techniques in place - traveling
clocks, common view, two-way satellite time transfer, post processing.
Nanoseconds are easy, hundreds of picoseconds can be done, but
picoseconds - not so much.
Obviously, time transfer between optical clocks has been done down in
the 10E-18 range which gets you there. But you're talking large
budgets. At 1ns per foot even the position of your antenna (if using
GPS) matters by less than a millimeter.
If it was easy - every time-nut would be doing it!
Do let me know if you come up with a solution.
Skip Withrow
Hello Martyn,
This is exactly the problem that all the national time services have
trying to formulate UTC (USNO, NIST, GPS, BIPM, and all the other
contributors). There are a number of techniques in place - traveling
clocks, common view, two-way satellite time transfer, post processing.
Nanoseconds are easy, hundreds of picoseconds can be done, but
picoseconds - not so much.
Obviously, time transfer between optical clocks has been done down in
the 10E-18 range which gets you there. But you're talking large
budgets. At 1ns per foot even the position of your antenna (if using
GPS) matters by less than a millimeter.
If it was easy - every time-nut would be doing it!
Do let me know if you come up with a solution.
Skip Withrow
