On 9/10/2010 7:26 AM, Ralph Smith wrote: > On Sep 10, 2010, at 7:50 AM, J. L. Trantham wrote: > >> 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. > The site currently under consideration is in Colorado. Only problem with > Loran, of course, is that is has been killed, thus the operative word "was" > above. If the design and approach bears out it could be deployed over a much > wider scale. > > Ralph Even if LORAN was alive it wouldn't meet the requirement. You'd still have 20-30 M position uncertainty in a differental application - way more than your 30 ns. I thiink that dropping LORAN was a really big mistake, but it wouldn't meet this need. I used to see several 100 ns of time drift and jitter when I was in San Antonio and watching Boise City, OK (~600 Mi)
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