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GPS satellites carry atomic clocks that provide extremely accurate time. The time information is placed in the codes broadcast by the satellite so that a receiver can continuously determine the time the signal was broadcast.
A satellite's orbit works because of a balance between two forces. The orbit is a combination of the satellite's velocity-the speed it is travelling in a straight line-and the force of the Earth's gravitational pull on the satellite.These forces are similar to the forces that keep all the planets in their places in the solar system. satellite's orbit works because of a balance between two forces. The orbit is a combination of the satellite's velocity-the speed it is travelling in a straight line-and the force of the Earth's gravitational pull on the satellite.