On 2014-12-09 04:10, Mike Monett wrote:
One very cute addition would be to pull down the NIST GPS data and
use it to correct your system on an hourly / daily basis. If you
do that with common view satellites, you most certainly will beat
a surplus grade Cs standard.
How can we do this? The NIST archives state
"The archive is only updated once every 24 hours, so data are not
available for today's date. Data from the previous day are added to
the archive at about 1600 UTC."
http://www.nist.gov/pml/div688/grp40/gpsarchive.cfm
Is there another page that has current data? If so, how do we
incorporate it into the GPSDO?
IGS http://igscb.jpl.nasa.gov/components/data.html has pointers to
get 15 minute samples from high rate IGS stations around the world:
http://cddis.gsfc.nasa.gov/Data_and_Derived_Products/GNSS/high-rate_data.html
USNO info tells you which SVNs/PRNs have Cs (few) and Rb (most) clocks:
might be interesting to compare accuracy of Cs vs Rb SVs in view.
--
Take care. Thanks, Brian Inglis
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