On 9/8/18 4:52 PM, paul swed wrote:
Hello to the group I won't quote figures here but did indeed help UrsaNav do testing. Hey 90 days with a HP 5071 that was a sweet deal at the cost of some power. They do send corrective data in the signal from reference sites and that helps propagation corrections in the receive software. It was impressive and even in buildings no less. Its been a while so thats why I don't want to quote figures. I sort of thought all of this would have been resolved by now. But nope not until the S.. hits the fan and finger pointing starts. I do know the other satellite system lightspeed? is trying to become an alternate. Regards Paul WB8TSL
But here's the problem - if "the network" is wiped out, how do you send the correction information?
I suppose you could have a low rate network (i.e. not "the internet") and for the most part, the propagation corrections (whether using 60kHz, Loran, Omega, or GPS) can be done with "climatology" - time of day and time of year.
BUT - if we're talking about a Carrington event or similar, a series of high altitude nuclear bursts - the propagation is going to be totally anomalous anyway.
If we're talking about a evil-doer taking down GPS AND "the network" together, but not perturbing the ionosphere, there may be other things to worry about - the network carrying "time" is also carrying all those high value transactions, phone calls, etc. and that's probably a bigger business disruption than losing network sync.
So I think GPS actually works pretty well - it will provide good sync for any non-global disaster. Likewise, a "campus" network will be able to stay synchronized, because they've got wired connections.
In a local disaster (hurricane, earthquake) it's likely that business has been disrupted by the disaster sufficiently that time sync is less important.
_______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
