The URL I posted earlier has an indpedth discussion of this (: It seems to imply to me that with processing a standard deviation of 8ns could be obtainable but I may have missed somethign in my quick skim thru the paper. If I have time this weekend I'll read thru it in more detail. It would be nice if a case could be made to restart a loran like system as GPS backup (:
The application in question seems to be concerned with the realitive time difference between sites as opposed to absolute accuracy so depending on how close they were together the propgation variances in a loran type solution may not be that signficant as they may be common to the a group of receiver sites. ----- Original Message ---- From: Hal Murray <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> Sent: Thu, September 9, 2010 9:18:16 PM Subject: Re: [time-nuts] Timing Distribution in Mountainous Terrain > Loran? What was the stability of Loran when used to distribute time? (I'm assuming I can use something like GPS for calibration.) Wikipedia says: The absolute accuracy of LORAN-C varies from 0.10-0.25-nautical-mile (185-463 m). Repeatable accuracy is much greater, typically from 60-300-foot (18-91 m). 60 feet would make it hard to get 30 ns accuracy, and that's probably at sea rather than in the mountains. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ 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. _______________________________________________ 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.
