Figure 3.1: Model 1095A/C Mounting Situation
in reserve. This arrangement guarantees that there will be at least four
satellites over any part of the earth at all times. Due to this arrangement,
GPS receivers must be able to identify and track these satellites as they
move across the sky, and decide which satellites are the most desirable
to use for positioning and timing data.
Note that Figure 3.1 depicts GPS satellites in a two dimensional
frame, and as such is inaccurate.
A true representation of GPS
satellite positions would be three dimensional, and would have satellites
scattered all over the sky, moving in different directions.
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