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I wanted to ask if anyone knows a way to measure the distance between two moving objects (actually one is fixed and one moving)? Can I place on one of them a transmitter and on the second one a receptor and know in real time the distance between the two? The range I'm looking in is about 0 - 0.5 meters and resolution of about 0.5 cm. Can anyone recommend on a way of doing it?

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  • \$\begingroup\$ How fast will the moving object be going? \$\endgroup\$ – EM Fields Oct 3 '15 at 11:19
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Sound is a relatively easy phenomena to use to measure distances because it is quite slow.

There are many answers which you could find on this site, e.g Why sound wave is the best choice for many location detectors?

This explains some of the issues around using electromagnetic radiation High precision trilateration in a small space and without ultrasound

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