> I wonder if you cannot do this same work from the ground. Has anyone tried > tracking single GPS satellites from the ground using very high gain > tracking antenna.
Many times. USAF does this each time they launch a new GPS satellite, to check out all the kit in a "high-res" view before they switch it on for general use. They used to use an antenna at Camp Parks in the California central valley. When that one was being overhauled a few years ago, they used Stanford's "big dish" for a while. It gives about 60 dB gain at L1, IIRC. Hardcore GPS researchers have used that dish and a bunch of others over the years. If you're interested, contact SRI. They used to charge a couple of hundred bucks an hour for the Stanford dish. Hard to use for weather forecasting, though, because you can only see one tiny chunk of atmosphere at a time. Cheers! --Stu _______________________________________________ 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.