Can you use tethered balloons at each site to obtain adequate S/N in their position to permit time calculations to 30ns uncertainty?
Pete Rawson On Sep 10, 2010, at 11:07 AM, Oz-in-DFW wrote: > > > On 9/9/2010 2:03 PM, Ralph Smith wrote: >> 1e-11 only buys you 3000 seconds of drift before blowing the 30 ns budget. >> Without going to cesium we will most likely need some form of mutually >> visible synchronization. > Is Cesium even enough? The requirement looks like about 6 parts in > 10e-14. That's hydrogen maser territory isn't it? > > Given the application you could probably achieve this with fiber > back-haul that you continually range and jitter filter to achieve that > resolution. Not gonna be off the shelf, though. Your could probably > layer data transmission on top of this. > > Why not just periodically release a metalized weather balloon as a > calibration target, or use one to lift a calibrated reflector in the > event of an outage? Or pick a conventionally tracked target as a > calibration source? > > -- > mailto:o...@ozindfw.net > Oz > POB 93167 > Southlake, TX 76092 (Near DFW Airport) > > > > > > _______________________________________________ > 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.