I guess I am thinking about this from a user perspective rather than an engineering design and implementation perspective. If the requirement is aircraft separation, LORAN should be adequate for that, if it was still up. You would only have to transmit your position and altitude to a ground receiving station that then would relay it to the Center Controllers to be displayed on a map along with all the other aircraft.
However, it seems they want to do this by use of an upside down but otherwise 'GPS like method', i.e., the 'satellites' are fixed to mountaintops and the aircraft still moves. That being the case, what about a fixed, land-line, connection for every mountaintop to a central location that broadcasts the time signal, calibrate the system using GPS then rely on the central ground station to keep it running? Joe -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on Behalf Of Oz-in-DFW Sent: Friday, September 10, 2010 12:21 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Timing Distribution in Mountainous Terrain 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) -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport) _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.