실내 무선측위 정밀도 향상을 위한 클럭 오프셋 보정 기법

Indoor wireless positioning system uses ranging information of readers in order to precisely estimate the location. To estimate distance between each readers and tag, the system calculates arrival time with clock of each reader including independent clock offset. This clock offset seriously affects the performance of ranging and positioning. We propose in this paper a clock offset compensation method to solve this problem. To verify the performance of the proposed method, we simulated location estimation with random clock offset between -1,000 and 1,000 part per million (ppm), and then the result shows that the proposed scheme effectively solves the clock offset problem.