VEHICLE SYSTEM, PORTABLE DEVICE, AND VEHICLE-MOUNTED DEVICE

摘要

A vehicle system includes a vehicle-mounted device mounted to a vehicle and a portable device portable by a user, and performs a control to the vehicle corresponding to a collation result performed based on a wireless communication established between the vehicle-mounted device and the portable device. The vehicle-mounted device includes a vehicle-mounted transmission unit which simultaneously transmits radio waves having a predetermined phase difference using at least two transmission antennas disposed orthogonal to each other. The portable device includes a triaxial reception antenna receiving the at least two radio waves, and a magnetic field strength detection unit detecting a magnetic field strength on each of three axes of the triaxial reception antenna. One of the vehicle-mounted device or the portable device includes an illicitness determination unit determining, based on the detected magnetic field strength, whether the wireless communication is established through an illicit repeater.

主权项

1. A vehicle system performing a control to a vehicle, the vehicle system comprising:
a vehicle-mounted device mounted to the vehicle; and a portable device portable by a user, wherein the vehicle-mounted device is capable of establishing a wireless communication with the portable device and the control to the vehicle is activated corresponding to a result of a collation performed based on the wireless communication established between the vehicle-mounted device and the portable device, the vehicle-mounted device includes a vehicle-mounted transmission unit which simultaneously transmits at least two radio waves having a predetermined phase difference from one another using at least two transmission antennas, and the at least two transmission antennas are disposed orthogonal to each other among a plurality of transmission antennas disposed in the vehicle, the portable device includes:
a triaxial reception antenna receiving the at least two radio waves transmitted from the at least two transmission antennas; anda magnetic field strength detection unit detecting a magnetic field strength on each of three axes of the triaxial reception antenna, and one of the vehicle-mounted device or the portable device includes an illicitness determination unit determining, based on the magnetic field strength detected by the magnetic field strength detection unit on each of the three axes, whether the wireless communication is established through an illicit repeater.