Direction finding for legacy bluetooth devices

摘要

An apparatus includes an antenna array including at least a first antenna element and a second antenna element separated by a first distance. The apparatus receives a wireless advertising message, having a known bit pattern, via the first and second antenna elements. The apparatus samples a first portion of the known bit pattern from the wireless advertising message received via the first antenna element, and samples a second portion of the known bit pattern from the wireless advertising message received via the second antenna element, and determines a phase difference between the received wireless advertising message at each of the first and second antenna elements by correlating the first sampled portion and the second sampled portion to the known bit pattern. The apparatus then determines an angle of arrival (AoA) of the wireless advertising message based at least in part on the phase difference and the first difference.