VEHICLE SYSTEM, PORTABLE MACHINE, AND VEHICLE-MOUNTED DEVICE

摘要

A vehicle system includes a vehicle-mounted device (10) to be mounted in a vehicle, and a portable machine (20) to be carried by a user, and controls the vehicle according to the result of matching using radio communication between the vehicle-mounted device and the portable machine. The vehicle-mounted device is provided with a vehicle-mounted side transmission unit (11) which transmits radio waves simultaneously with a predetermined phase difference from at least two or more transmission antennas (11a, 11b, 11c) disposed to be orthogonal to each other among a plurality of transmission antennas disposed in the vehicle. The portable machine is provided with a triaxial reception antenna (21) which receives the radio waves transmitted from the plurality of transmission antennas, and a magnetic field intensity detection unit (25) which detects the respective magnetic field intensities of three axes of the triaxial reception antenna. Either the vehicle-mounted device or the portable machine is provided with an illicitness determination unit (13, 26) which determines on the basis of the respective magnetic field intensities of the three axes detected by the magnetic field intensity detection unit whether or not the radio communication is performed via an illicit repeater.