Base Station Selection Method for UWB Indoor Positioning Based on TDOA Fingerprint

The ultrawideband (UWB) indoor positioning system has poor positioning accuracy and stability in the indoor environment with complex structure, which is affected by non-line-of-sigh (NLOS), multi-path effect, physical measurement and other factors. Therefore, this paper proposes a UWB base station (BS) selection positioning method based on time difference of arrival (TDOA) fingerprint. Firstly, TDOA information and BS selection information of the reference point are collected in the off-line phase. Secondly, in the on-line phase, the improved time reversal resonating strength (TRRS) algorithm is used to match the fingerprint database, and the BS selection information recorded by the fingerprint points with the highest matching degree is used for positioning solution. Finally, according to the experimental data, in the 30m*5.5m*3.1m NLOS exhibition hall, the average three-dimensional error is 10.93cm, and the average variance is 10.27cm
²
. The experimental results show that the proposed method has high reliability and stability.