Phil Kane wrote:
On Mon, 24 Mar 2008 00:10:13 EDT, wrote:
Each GPS sattelite has it's own on board atomic clock and the system can
easily provide UTC with accuracy on the few microseconds level with an
ultimate limit of +/- 340 nanoseconds using an appropriate receiver and
hardware.
Something must have changed (or been fixed) then - we made
measurements about three years ago and there was about six seconds
offset - an eternity for accurate time measurements. 340 nanoseconds
we can tolerate. Six seconds we can't.
--
The only thing that has changed since the first sattelite launched is
that the accuracy degrading dither for civilian use was removed about
7 years ago. With the dither the time accuracy was in the range of tens
of microseconds.
Whereever you were getting your six seconds of error from, it wasn't
from the GPS system.
--
Jim Pennino
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