signal strength on a GPS

[josephkk]

So in reality, you need four independent signal strength signals for
the best (geometry) four satellites

Four satellites is minimum for a 3d solution, precision increases
dramatically with 6 or more satellites in view. Today having 10
satellites in view is normal out in flat country terrain. Cities and
mountains not so much.

?-)

 

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Four satellites is minimum for a 3d solution, precision increases
dramatically with 6 or more satellites in view. Today having 10
satellites in view is normal out in flat country terrain. Cities and
mountains not so much.

Adding GLONASS satellites to your constellation helps immensely. Several chip
vendors are adding GLONASS for this reason.