A method for controlling access to a facility including: sending a first signal from a handset to a plurality of beacon modules using a low energy wireless technology, the signal comprising an identification of the handset or a user; determining received signal strength indication from each of the plurality of beacon modules and determining a time averaged received signal strength indication from each of the plurality of beacon modules. The method also includes determining the location of the handset based on the pattern of the received time-averaged signal strength indications from the plurality of beacon modules, sending a second signal from the beacon modules to an authentication server, the second signal comprising (i) the identification of the handset or a user and (ii) the time-averages received signal strength indication or individual received signal strength indication from each of the plurality of beacon modules and determining at the authentication server the nearest user or handset to an access controlled gate of the facility if a signal from more than one handset is received. The method also includes determining if the handset or user is authorized to enter the facility and opening a gate to allow access to the facility if the handset or user is authorized.