Measurement accuracy of Wi-Fi FTM on actual devices

抄録

Demand for positioning services such as object tracking systems and navigation systems is increasing. The current Wi-Fi positioning system uses the algorithm using mainly the signal strength. However, the signal strength is susceptible to multipath propagation, thus the ranging error generally large. The IEEE802.11mc specifies the fine timing measurement (FTM) protocol based on round trip time (RTT). As of now, few commercial products support the FTM function. The objective of this letter is to evaluate the accuracy of the Wi-Fi FTM using the actual devices and to perform one-dimensional positioning by a simple algorithm. In the one-dimensional positioning, average positioning accuracy is 0.10 m in outdoor and 0.23 m in indoor.