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What’s the best way to wirelessly measure the distance between two objects (computer, smartphones or a specialised device) that are a few meters apart down to a ~10cm accuracy?
Is this possible by piggybegging on WLan, bluetooth or GPS?
Ekahau specialise on doing this kind of thing with WiFi. You’re better off using light to get precision measuring as RF (Radio Frequencies) can be distorted by the environment. There are numerous patents in this area for many of the ‘good’ solutions.