Asset Tracking System Using Long-life Active RFID Tags

We have developed an asset tracking system using long-life active RFID (radio frequency identification) tags that reports the position of an asset when required. To determine the location of a tag attached to an asset indoors, such as in stores, warehouses, and offices, we use a high-precision location system that is not greatly affected by environmental factors. Experimental results show that the root-meansquare error between the estimated and actual tag positions measured at 77 points is 2.9 m, indicating that this locating system is applicable not only to asset tracking but also to other ubiquitous services that utilize the position of an item or a person indoors.