RADAR - Microsoft Research: "The RADAR system works using a radio map. A radio map is a lookup table that holds collections of packet signal strengths and the building locations where these signals were measured. To locate the user's position, the user's wireless device measures the signal strength from the APs within its range and then searches the radio map to determine the signal strength entry that best matches the measured signal strength. To improve its estimate, RADAR takes into account the recent movement history of the user and dynamic changes such as temperature, the number of people present, and any other environmental factors which will effect the radio map."
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