| 摘要 |
<p>The present invention relates to a real time location tracking system using surface acoustic wave (SAW) tag and, more particularly, to a real time location tracking system using SAW tag capable of being location measured three dimensionally, composed of SAW tag in which PN code is applied, a plurality of nodes computing SAW tag distance by receiving SAW tag signals from the SAW tag, access point (AP) estimating the location of SAW tag three dimensionally using the distance values of SAW tag received from the nodes, and a smart terminal receiving the location value of SAW tag from the AP and displaying the same. The real time location tracking system of the present invention includes an input interdigital transducer (IDT) producing SAW on one side of a piezoelectric substrate and output IDT on the other side of the piezoelectric substrate. Also, the output IDT includes: SAW tag displaying an inherent identification code; node computing SAW tag distance which is a distance between a corresponding node and SAW tag using the SAW tag signal, receiving the SAW tag signal from the SAW tag and transmitting chirp signals to the SAW tag; AP estimating the SAW tag location using the values of SAW tag distance received from the nodes; and smart terminal displaying the received values of the SAW tag location on a display unit after receiving the values of the SAW tag location from the AP.</p> |
