Question

Mention the reason for clock offset error in GPS.

Hint:

GPS uses extra satellites to correct clock errors and improve accuracy.

Answer 1

GPS clock offset errors arise from the lack of perfect synchronization between satellite and receiver clocks.
While GPS satellites employ extremely precise atomic clocks, GPS receivers utilize less accurate quartz clocks due to cost and size constraints.
Any temporal discrepancy between a satellite's clock and the receiver's clock introduces a minor inaccuracy in calculating the pseudorange (distance) to the satellite.
Even a timing error of a microsecond can result in substantial positional errors on the ground.
GPS receivers mitigate this by receiving signals from at least four satellites, enabling simultaneous calculation of the receiver's position and clock bias.
Consequently, imperfect synchronization is the primary contributor to clock offset error in GPS.