Thomas Laus wrote:

> It should happen twice a day, nearly 12 hours apart.  Each GPS satellite
> is in an approx. 12 hour orbit.  Your view of the constellation is the
> same about every 12 hours.
>

I don't think so ! Each GPS satellite do 2 Earth rotation every 24
hours. But, in a fixed point on the Earth, a receiver do not see one
satellite for 12 hours ! And, the algorithm implemented in the receiver
select the strongest signal from those received one time. So, the
receiver locks on several satellites over a day.

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