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2

I was hoping that the OP provides some feedbacks, in order to be on the same page so that I can write a very short answer. But, never mind. I will try, by a analogy, to illustrate the type of pitfalls one should avoid when working on clock requirements in GNSS. Assume my neighbor has a very expensive Rolex watch and I bought my wife a cheap copy. Then my ...


5

If we want the usual GPS position error less than 10 m we should know the time needed by light or a microwave to cover this distance. The speed of light is $3 * 10^8 m/s$, so we need 33.3 nanoseconds for 10 m. To measure a distance, GPS measures the time needed by light for that distance. To be better than 10 m position error, the clock error should be less ...


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