Re: [gpsd-dev] ✘cgps

[Hal Murray]

address@hidden said:
> With my SxBlueIII-GNSS, I've noticed a certain reluctance to incorporate
> GLONASS satellites into the fix, which is I suspect due to the less tightly
> controlled clock offsets between systems.  Claims of "it's like having twice
> as many satellites" are oversimplified.  At the least, I'd expect to have to
> add an extra state variable to the Kalman filter to represent the
> inter-system clock offset. 

Is there any data available on how well the various systems are tracking?

I think I've seen data on how well GPS tracks UTC.  It may have been UTC-NIST 
or UTC-USNO.  If similar data is available for the other systems it should be 
possible to merge them.

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