A novel indoor localization scheme

Ultra-wideband (UWB) receivers can resolve individual multipath components (MPCs), due to the signal occupied a large bandwidths, so they are capable of accurately estimating the time of flight of the signal. To realize high-accuracy indoor localization, a novel UWB locating scheme through estimating the round trip time (RTT) of UWB signal is proposed. Each reference station (RS) transmits the baseband pulse modulated UWB signals. The signals are received by the user terminals (UT) and sent back to the original RS using a different carrier frequency. We can easily calculate the position of the UT by detecting the time gap between the feedback signal and the origin signal. Meanwhile, the multi-path detection algorithm for RTT estimation is presented and the localization performance of the proposed scheme is tested under IEEE 802.15.4a channel models. Experiments demonstrate that the proposed scheme can realize high accuracy localization with an error around the centimeter level.