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" ... What about the body effects and non-line-of-sight paths? One of the great things about using radio signals for communication is that they can flood into a large area by passing through objects, diffracting around objects, and bouncing off objects. These properties are however a big challenge for using the same signals to determine the range between transmitter and receiver. When a BLE signal passes through an object it loses a lot of power, the equivalent of travelling a greater distance in open air. So detecting a weak power means either the signal has travelled far in the open air, or travelled a short distance through an object, or it could mean it has bounced around the environment a lot. Resolving these ambiguities will help to reduce false positives and false negatives, but it isn’t easy. Here are some things that we can try: ... "