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The signal travels 10 feet or 3m in 10^-8 seconds. I don't think the sampling circuit has that kind of resolution.



I think it could. For example, the Leica Disto2 laser rangefinder has a minimum measuring distance of 5cm. I don't see why an RF-based system couldn't do adequately for this use case.

http://www.leica-geosystems.us/en/Leica-DISTO-D2_69656.htm




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