On Fri, 25 May 2001, AB Ramos wrote:
> On Fri, May 25, 2001 at 10:15:11PM +0800, Miguel A.L. Paraz wrote:
> > anyone using GPS to sync their NTP clocks in the Philippines?
>
> GPS as in Global Positioning Something-or-other? NTP as in Network Time
> Protocol? It has a clock? If it had a clock, why would anyone want to
> sync it with a satellite?
>
I guess you have no idea how the GPS system works. It works by measuring
the time it takes for a signal to travel from the satellites to your GPS
receiver. If you receiver's internal clock is exactly synced with the
highly accurate atomic clocks carried by the satellites, the time taken
for the signal to travel from three satellites should determine your
position. For this to be any accurate, you'd need clocks of the utmost
accuracy on the satellites.
So you could synchronize an NTP server based on the time signals from
several satellites using a GPS receiver (since your position is fixed
anyhow).
Read the GPS FAQ at http://www.gpsy.com/gpsinfo/gps-faq.txt for more
information.
--
Rafael R. Sevilla <[EMAIL PROTECTED]> +63(2) 8177746 ext. 8311
Programmer, InterdotNet Philippines +63(917) 4458925
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