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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.
Here are the basics of how it works. 1  There is an X-ray generator, a device that produces the radiation by means of an X-ray tube as described above. 2  There is a device that detects the X-rays â nowadays this will typically be a digital X-ray detector (such as a flat panel detector), but could perhaps be a photo film.