A Study on the Real Time Location Sensing of Moving Object using Active RFID Reference Points of Road Lamp
차맹규, An Jin Chagn, LeeJaebin, Kiyun Yu · 2007
RFID (Radio Frequency Identification) is regarded as a device to facilitate location sensing. Such advantages of RFID can be integrated with LBS (Location Based Service) achieving much synergy effects. This study propose and test a location sensing system using the active RFID tags. Since the coordinates of road ramps are already stored in a database as a digital map form and the road ramps placed along the curbs construct a sort of network, it is proposed to use these road ramps as reference points. Furthermore, these road ramps can provide electrical power to the active RFID tags. Thus, each moving object having a RFID reader receives signals from these active tags and decodes corresponding coordinates of the road ramps. Then, the coordinates of a moving object are determined in real-time using the TDOA (Time Difference of Arrival) algorithm. To test the availability of this system, various kinds of constrained simulations are designed and are conducted. In these simulations, the number of active tags used, the transmission interval of RFID reader devices, and the speed of moving objects are considered as constrained factors.