[time-nuts] Timing Distribution in Mountainous Terrain

Mark Spencer mspencer12345 at yahoo.ca
Fri Sep 10 15:43:21 UTC 2010

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 <hmurray at megapathdsl.net>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
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.

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