Hi
   A high sample rate for such ns times of arrival resolution is
impractical. Same holds for high SNR and longer times of measurement. GPS
and most other high resolution positioning systems stitch the information
together from the signal time of arrival with the carrier phase of arrival.
Since carrier frequencies are incredibly high, their phase can provide such
ns accuracy because the phase information is preserved across the
downconversion stages with sufficient linearity. For this purpose, the
algorithms also need to determine the integer number of arriving
wavelengths.
Cheers,
Qasim

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