Dear Bruce Posted too hastily ...
Since you don't care about absolute time, maybe using identical receivers you might be able to get a few hundred ps synchronization using a PPP solution, for example. Attached is 6 months of data for two Javad receivers, with daily PPP solutions. The antennas for these receivers are separated by about 400 m. Cheers Michael On Mon, Apr 11, 2016 at 3:00 PM, Bruce Griffiths <bruce.griffi...@xtra.co.nz > wrote: > There is a proposal to use multiple light bucket style optical telescopes > to do Intensity stellar Interferometry over short baselines (up to perhaps > 1km or so) by using independent clocks to time tag photon arrivals. store > the time tags and process the data off line. Depending on the time tag > resolution there is a need to measure the time differences between the > independent clocks to an accuracy in the 1ns to 100ps range. Is there a > better way of doing this other than using geodetic grade GPS receivers > capable of GPS carrier phase measurements?Since the local clock flywheel > oscillators will need to not deviate by more than 100ps or so over the > several minutes required to perform the carrier phase averaging what sort > of clock will be suitable apart from a good rubidium standard with a > cleanup oscillator? > NB Running fibres or coax between the telescopes isnt an option. > > The relative positions of the telescopes has to be known to within a cm or > so for this to work. > Bruce > > _______________________________________________ > 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. >
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