2 ms·

i don't know what current state of the art is and even 3mm sounds crazy good when i think about it (i was just repeating the spec sheet). i wonder if it that a

• bigiain 13y ago
  As I understand it - once you can get the time-based position fix accurate enough, you add in the phase information from the 1.2GHz carrier wave - with a wavelength of ~200mm, resolving that to 0.2mm seems reasonable. The problem of working out which of the peak/troughs in the carrier wave you're in almost certainly requires terrestrial DGPS assistance (http://en.wikipedia.org/wiki/Differential_GPS http://en.wikipedia.org/wiki/Differential_GPS). If you can use that to get ~100mm precision - that allows you to use the phase difference in the 200mm wave length to get sub mm measurements. Like I said, I understand how it works – I just find it hard to believe it's actually practically possible… Deep magic…