Richard B. Gilbert wrote: [] > Assuming a GPS *TIMING* receiver, and that it can be installed with > the antenna having a good view of MOST of the sky, you can expect > results that are *almost* as good as the atomic clocks on board the > satellites! > You do need to run a "site survey" to establish your location as > exactly as possible! Once your location is known, the calculation of > the "speed of light delay from your selected satellite to you can be > done quickly and easily.
I didn't have such difficulties when using today's sensitive GPS devices - e.g. GPS 18x LVC: http://www.gpsw.co.uk/details/prod2402.html Having a view of, say, a 180-degree arc of southern sky is probably good enough. I have mine indoors, sitting on top of a PC on the top floor of my building. No separate antenna. The earlier GPS 18 LVC sits on the roof. The GPS determines its location all by itself - no site survey required. Microsecond accuracy. Of course, if you are looking at a basement located or tempest-spec server room, using GPS becomes rather more difficult! Cheers, David _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
