[time-nuts] GPS message jitter (preliminary results)

[Mark Sims]

A lot of the newer GPS modules can accept "dead reckoning"  data from external sensors and integrate that into their location solutions.  The receiver does all the Kalman filtering foo for you.  Also you can get receivers with up to 50Hz position updates (you have to run the com link at very high speeds to accommodate all the data that they send).   This well help minimize the "staleness" of the GPS fix versus true position.

Also you can now get affordable real-time kinematic receivers that will give you your location relative to another receiver with centimeter accuracy.

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> But up until now I have forgotten that the NMEA location data is likely some tens or hundreds of milliseconds old before it is output on the wire