[FOSS-GPS] Different of algorithm between using GPS only and combined GPS+Glonass

[solver90]

Hello

The main difference between GPS and glonass (in term of localization
process) is in the number of parameter to estimate.

In GPS, you have 4 parameters : 3D position and clock bias
In Glonass, you have the same

but when you combine, the clocks of GPS and glonass are not the same, so:
In GPS+Glonass positioning, you have 5 parameter to estimate: 3D position,
GPS clock bias and Glonass clock bias. 

Of course, you will have better precision because you use 2 times much more
data (less than two times).



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