Hi Satellites appear to be out. Best case, pulsars would be a once a day thing. You would need a bit better than 30 ns on the transfer (10?) to get the system to perform.
To put an order of magnitude on the difficulty: I believe that 20 ns is in the same range as the error national standards labs hold relative to UTC. http://tf.nist.gov/pubs/bulletin/nistusnoarchive2009.htm That's with a lot more effort than any rational system is going to put into timing. Also that's with GPS available to allow precision time transfer. Bob On Sep 10, 2010, at 5:15 AM, Peter Monta <pmo...@gmail.com> wrote: >> Aren't pulsars a reliable accurate time source or do they not provide the >> 30nS over ten days accuracy? > > By using them in common view, though, any absolute error would drop > out. I'm not sure pulsar pulses are fast enough to do discrimination > at 30 ns time scales, though. VLBI with broadband sources (quasars) > would be fine here, but large amounts of data would need to be > exchanged, and the sources are weak, requiring large antennas. > > Satellite laser ranging using LAGEOS and friends? But the original > poster said no satellites (not even passive rocks in MEO?), and > weather is a problem. > > Cheers, > Peter Monta > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.