센서 네트워크에서 위치인식 시스템을 위한 센서 노드간 거리 측정 방식의 비교와 오차율 개선 방법 연구

Thare are a lot of ways to measure the range between the sensor nodes for the location tracking system. It can be measured by CSS, ultrasonic, RSSI, and UWB. CSS(Chirp Spread Spectrum) technology adopt SDS-TWR algorithms of TOA(Time of Arrival) using velocity of specific medium and ToF(Time of Flight) to measure a distance, but this method always has a regular error on distance regardless of a real distance, in this paper, we propose new method measuring adistance more precisely in near distance usingCSS and RSSI and the best way by UWB.