Bluetooth AOA Localization Technology Based on LS and MUSIC Algorithms

The estimation of incoming wave direction of Bluetooth 5.1 protocol provides a new way to realize high precision indoor positioning of mobile terminals. Aiming at the problems of low accuracy of real-time Bluetooth Angle estimation and poor stability of continuous positioning caused by indoor multipath interference, a joint location algorithm of least squares and multiple signal classification was proposed. The positioning base station adopts rectangular array, which is divided into reference array and positioning array. While the positioning array collects the phase of incoming wave signal, the least squares algorithm estimates the phase of reference array, and then realizes the two-dimensional Angle estimation based on phase difference through multiple signal classification algorithm. The joint location algorithm realizes the time synchronization of incoming wave phase of rectangular array antenna and reduces the multipath error of signal acquisition. The simulation and experimental results verify the advanced theory of least square and multiple signal classification joint algorithm. The joint algorithm improves the positioning accuracy and stability in the indoor static and moving process, and has high application value.