[time-nuts] TruePosition GPSDO Holdover Issues
Mark Sims
holrum at hotmail.com
Tue May 15 21:20:49 UTC 2018
Lasy Heather can read a receiver data capture file as a "simulation" file. Use the /rs=filename command line option. You can also specify the /0 command line option (don't use serial port) and /rx= command line option to specify the receiver type. The simulation file reads in at around 20-30 times faster than real time (goes faster when the mouse cursor is kept out of the plot area),
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>First is to collect the data. I have a python
script that grabs everything from a NMEA device and logs each line with a
time stamp. The GPS orbit period is 12 hours so you need 12 hours of data to
see everything. But there are 30 satellites, so a few hours will show the
hole.
The next step is to extract the data into a useful format. That's another
python script. Then, just feed that to gunplot.
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