VEHICLE DIGITAL KEY SYSTEM

A vehicle digital key system according to an embodiment of the present invention comprises: a first communication module for broadcasting a first signal at a predetermined time interval, calculating, when a second signal corresponding to the first signal is received from a key fob, a distance to the key fob on the basis of the second signal, and switching, when the calculated distance is within a preconfigured first threshold, a second communication module from a sleep mode to a wakeup mode; a second communication module for switching a plurality of third communication modules from a sleep mode to a wakeup mode, and calculating a position of the key fob by using at least three third communication modules among the plurality of third communication modules; and a control unit for unlocking the door lock of a vehicle on the basis of the position of the key fob.