基于RFID的室内智能导航系统

ccurate indoor localization and navigation techniques are important and novel emerging techniques for public service, commercial applications and security. This paper presents a mobile terminal localization and intelligent navigation system for the large-scale indoor environment. This system is based on the RFID technology and the TDOA (Time Difference of Arrival) between radiofrequency and ultrasonic signals to estimate distance, and employs the three-point localization technology to achieve accurate position estimation of the hand-held mobile terminals. Then A * search algorithm is introduced to realize accurate and efficient navigation. As the experiment proves, this system can provide the average 3cm distance estimation precision, which is able to meet the requirements of indoor localization.