[time-nuts] Timing Distribution in Mountainous Terrain

[Ralph Smith]

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