Abstract

The success of the Global Positioning System (GPS) makes the demand for location-based services increase rapidly. However, in the indoor environment, since the reception of the satellite signal is disrupted severely, the accuracy of GPS positioning can not meet the requirements. Radio Frequency Identification (RFID) technology with the advantages of non-contact, non-visibility, low cost and high positioning accuracy, begins to get more and more attention and becomes the most suitable indoor positioning technology. RFID location is a technique which is based on signal strength positioning, using the received signal strength indication (Received Signal Strength Indicator, RSSI) to determine the position of the object. In recent years, the indoor positioning technology has made great progress, especially on the verity of the localization algorithm. In this paper, we will briefly describe the basic principles of RFID, then we introduce the algorithms of existing indoor RFID positioning system. Finally, we analyze their strengths and weaknesses.

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