[ntp:questions] Re: Bought a GPS receiver--What next?
davids at webmaster.com
Tue Nov 2 02:16:49 UTC 2004
"Richard B. Gilbert" <rgilbert88 at comcast.net> wrote in message
news:hISdnS39t4qMdxvcRVn-pQ at comcast.com...
> We had a long discussion on the topic here a few weeks ago. The long
> and the short of it is that Motorola should have written a much better
> manual. The chapter on how it all works leaves far too much room to
> read between the lines. The leading edge of the PPS signal marks the
> exact "top of the second". The receiver adjusts its measurement epoch
> to keep it within one millisecond of the top of the second.. There are
> facilities built into the Motorola command set to allow adjusting the
> "top of the second" for cable delays and other systematic errors.
One millisecond is pretty poor PPS accuracy for a GPS receiver intended
for timing applications. One microsecond is typical.
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