Date Added: Mar 2013
The ability to precisely localize RFID tags with low latency and low cost is desirable for applications such as inventory, asset tracking and robotic-manipulation of tagged items. However, because of multipath propagation effects, traditional RFID positioning methods based on RF Received Signal Strength Indication (RSSI) have limited accuracy (meter-scale) or require large numbers of reference tags and readers, which increases both latency and cost. Acoustic localization systems can be more precise, but typically require a battery-powered sensor platform, which both increases tag size, weight and limits tag lifetime. In addition, conventional acoustic localization systems are not integrated with existing RFID infrastructure.