On Sep 9, 2010, at 9:27 PM, Bob Camp wrote: > Hi > > If 30 ns is the system goal, then you have a lot more to budget for than > simple clock error. You could easily be below 10 ns for just the clock > portion of the budget. I suspect that multiple 5071's and a maser or two at > each site will be the ultimate solution if each must stand alone for 6 days > and the set of 10 stay within 30 ns p-p. If reliability planning includes 6 > days past end of GPS it also likely includes significant redundancy and more > than a few 9's in the confidence factor. > > I suspect it's cheaper to buy the 5071's than to have a half dozen SR-71 > category aircraft ready to climb high enough to act as common view targets. > High altitude balloons might work pretty well and they would be cheaper to > keep in hot standby mode.
I expect the more likely outcome to be a reality adjustment and relaxing of the requirements, possibly with some form of satellite common view target. Ralph _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
