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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.
If you know all that, you know more than 99% of people already. The way satellite television works. Satellite TV works because large facilities broadcast a signal up to a satellite. The satellite is more than just a mirror that bounces the signal back down to earth, although that's how it acts. In fact, it gathers up all the information it receives, sends information back to the broadcast facility, and then repackages, redistributes, and retransmits that signal back down to earth.