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Subject: GPS Timing
From: Vic Fraenckel (vfraenc1@XXX.XXX)
Date: Mon Jul 29 2002 - 07:05:18 EDT
I posed the question on a newsgroup alt.satellite.gps about obtaining timing
for celestial navigation (current thread mentioned below) from a gps
receiver:
| >I am the originator of the current thread. I was thinking about how one
| >might use a GPS receiver as the time source for celestial navigation
fixes
| >at sea. I really do understand that the "current" time is available from
| >several NMEA sentences and that these sentences incur some latency. I
| >suspect WWV and a good quartz clock is better.
| >
and I receive the following as one response:
| Surely for celestial navigation, errors of sighting are MUCH worse than
the
| possible 1 or 2 second errors of GPS time as transmitted in the NMEA
| sentence. Since time seconds and arc seconds roughly correspond in this
| application, I would ask whether you seriously think you can measure the
| position of a celestial body to within 1 arc second under normal
navigation
| conditions.
|
Does this response make any sense?
Any enlightenment will be appreciated.
Vic
________________________________________________________
Victor Fraenckel - The Windman vfraenc1@XXX.XXX
KC2GUI www.windsway.com
Home of the WindReader Electronic Theodolite
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