On Tue, Oct 23, 2012 at 10:29 AM, G.W. Haywood <[email protected]> wrote: > http://www.satmagazine.com/cgi-bin/display_article.cgi?number=1419024350
I guess this is a bit OT, but that article seems to imply that these re-radiated GPS signals can provide positioning service inside of long (1,150 meters in the example) tunnels for train control systems, and I am having trouble imagining how that works. Since the signal is traveling from the satellite, through a pickup antenna, a long run of cable, and various electronics and converters, through a rebroadcast antenna, and then to the receiver [as opposed to "from the satellite to the receiver" directly], wouldn't that make the accuracy of any position fix obtained from such a signal extremely inaccurate? I'd appreciate hearing any thoughts. -Rusty _______________________________________________ pool mailing list [email protected] http://lists.ntp.org/listinfo/pool
