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RFID tag location in a 3D environment is§investigated. The location of the tag with unknown§coordinates can be estimated with certain accuracy.§However, accuracy can be improved using the knowledge§based on measurement of additional reference tags§with known location. This book studies the§mathematical formulation and practical realization of§location sensing using RFID tags.§§Deviating from the standard use of RFID technology§which employs one tag reader to identify presence of§tag, multiple tag reader with known location are used§to estimate the physical location of an individual§tag, with/without the help of few reference tag with§known location. Additionally, concept of§trilateration has also been extended for tracking the§tag on unknown location without use of reference§tags. It was demonstrated that both approaches were§proved to be cost-effective technique and estimation§of the location of a specific tag has been achieve§with sufficient accuracy.