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I can imageine that. Although not using Channel Sounding, as it has a accuracy of +/- 200mm according to TFA. Which is still very good, though.

I don't follow your reasoning. (+-)200 mm is better accuracy than 1000 mm.

1m? 1mm? Apparently I was seeing double

In case you're not familiar with the metric system: 1m is 1000mm. In other words, one millimeter is one thousandth of a meter.