What’s the relationship between RSSI and distance in indoor positioning?

The initial intention of iBeacon is to trigger particular events indoor as well as to realize indoor positioning. We can calculate the distance between a smartphone and Beacon using RSSI and distance formula. But one thing to be noted is that this formula only applies in a case of short distances; the longer the distance is, the higher the risk is for the result being disturbed by the multipath effect of the electromagnetic wave, signal interference and human/object blockage thus lowering the calculation accuracy. Higher accuracy can be achieved by triangulation and fingerprint algorithm, however, requires more research and exploration by developers.


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