title: How to calculate distance from Wifi router using Signal Strength?
body: <p>I would like to calculate the exact location of a mobile device inside a building ( so no GPS access)</p>
  
  <p>I want to do this using the signal strength(in dBm) of at least 3 fixed wifi signals(3 fixed routers of which I know the position)</p>
  
  <p>Google already does that and I would like to know how they figure out the exact location based on the this data</p>
  
  <p>Check this article for more details : <a href="http://www.codeproject.com/Articles/63747/Exploring-GoogleGears-Wi-Fi-Geo-Locator-Secrets" rel="noreferrer">http://www.codeproject.com/Articles/63747/Exploring-GoogleGears-Wi-Fi-Geo-Locator-Secrets</a></p>