RTLS 서비스를 위한 고정밀 위치추정 기법 연구

Abstract

In this paper, we propose a high precision location estimation scheme for the RTLS (real time location systems) services and analyze the performance in various conditions. The proposed scheme is based on the RTLS specification (ISO/IEC FDIS 24720). We place 1 to 8 readers in a circular or rectangular shape in 300m×300m searching area. We also uniformly locate the tags (i.e., the targets for estimating the location) at 3 meters intervals and then conduct the experiments. From the results, when the number of the available readers and the received sub-blinks are more than 4 and 2 times, respectively, it satisfies the RTLS specification (i.e., within 3m accuracy) regardless of the shape of the reader arrangement. When we compare the performance in a viewpoint of the shape of the reader arrangement, the rectangular arrangement shows 0.2m~0.5m more deteriorated performance than that of the circular arrangement. However, the rectangular arrangement still satisfies the estimation accuracy 3m, required by the RTLS specification. Moreover, considering an additional extension of the searching area and implementation feasibility for practical applications, the circular arrangement has a difficulty in implementation. Therefore, even though the rectangular arrangement provides slightly worse performance, it is more suitable for real applications. From these results, we confirm that the proposed location estimation scheme is well-suited for the high precision location estimation to offer the RTLS services. Furthermore, the proposed location estimation scheme is a proper choice of the system implementation considering an extension of the searching area.