[time-nuts] Timing Distribution in Mountainous Terrain
J. L. Trantham
jltran at att.net
Fri Sep 10 11:50:59 UTC 2010
Loran was used as an area navigation method in aviation for many years. It
was available nation wide with a number of chains. I had assumed that the
area of interest was the Rocky's but if the Appalachians, even better.
In aviation, 0.25 nm is 'precise'. If you get me to within 0.25 nm of the
airport, I can probably find it. However, it would not be precise enough
for a 'precision approach'.
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Hal Murray
Sent: Thursday, September 09, 2010 11:18 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Timing Distribution in Mountainous Terrain
What was the stability of Loran when used to distribute time? (I'm assuming
I can use something like GPS for calibration.)
The absolute accuracy of LORAN-C varies from 0.10-0.25-nautical-mile
m). Repeatable accuracy is much greater, typically from 60-300-foot (18-91
60 feet would make it hard to get 30 ns accuracy, and that's probably at sea
rather than in the mountains.
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