"the American plan is for GPS and Galileo satellites to employ the same frequencies"
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Does that make sense to anybody? Surely, they need to be using DIFFERENT frequencies within the same overall band, in order to remain distinguishable but still be within the capability of a simple receiving device?
If they tried to work on the SAME frequencies, then the result would surely be that neither of them could work reliably, in exactly the same way as it is not sensible for two radio stations in the same area to broadcast on the same frequency.