Dynamic calibration and zero configuration positioning system for WSN

Indoor localization is of key importance in many areas of application and market sectors. There are many approaches to solve the problem, based on optical, ultrasound or radiofrequency measurements. RF has been increasingly used with the deployment of Wireless Sensor Networks (WSN) based on standards like WiFi, Bluetooth or Zigbee, so that additional hardware is not required for localization. A desirable characteristic in these systems are the zero configuration and dynamic calibration features. Based in these two characteristics, some methods have already been developed for WiFi and Bluetooth standards. In this paper a dynamic calibration localization system for WSN is presented, focused on IEEE 802.15.4 standard. Quite robust experimental results have been obtained from a prototype developed on Tmote Sky devices.