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Caused by slight discrepancies in each satellite’s four atomic clocks.
Satellite clock errors
Variation in satellite orbits due to gravitational pull and solar pressure
fluctuations.
Orbit errors
Causes the GPS satellite radio signals to be refracted as they pass through the earth’s atmosphere
Ionospheric interference
GPS errors are largely due to water vapor in this layer of the atmosphere.
It is fairly insignificant to GPS.
Tropospheric interference
the electromagnetic field that the receiver’s internal electronics
generate when it’s turned on.
Receiver noise
caused by reflected radio signals from surfaces near the GPS
receiver
Multipath interference
