On 12/19/16 6:28 AM, Chris Caudle wrote:
On Sun, December 18, 2016 10:20 pm, Bob Stewart wrote:
I do understand the reasons that these users want this quality of
output. It's who these users are, what fields, industries, etc, that I
didn't quite understand.
Magnus wrote a paper recently on effects of the GPS time slip (recent
error in data upload) on the broadcast industry which uses GPS time to
synchronize widely separated transmitters so that they can overlap their
broadcast coverage areas without interference.
I believe the power industry is using GPS provided time to stamp power
events for analysis as well.
And pretty much any of these will ingest a 1pps + message, rather than,
say, a 10 MHz reference.
Why not just use the raw GPS 1pps (which is typically good to a few tens
of ns)? GPS coverage/outage and random variation in the GPS 1pps
A lot of them use a disciplined oscillator to generate the 1pps, so the
oscillator is essentially a long term averager/low pass filter on the
raw GPS output -
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