>I imagine this would entail some MAJOR signal processing.
>I don't know personally but this sort of  sounds like
>what a cellular base station does with multiple channels.

Have a look at how the GPS system receivers do it. Companies like ST do have
the chip set data sheets available on the web, although you will not be able
to get hold of chips unless you look like using some close on 100,000 units
per year.

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