Patent attributes
A vehicle communication system comprising a vehicle-mounted device that transmits signals from a plurality of transmitting antennas on a vehicle; and a mobile device that receives signals transmitted from the vehicle-mounted device and transmits a response signal including received signal strengths of received signals. The transmitting antennas include: a first transmitting antenna in the vehicle cabin which is deviated in one direction in the width direction of the vehicle from the central portion in the width direction; and a second transmitting antenna nearer to the other side surface in the width direction of the vehicle. The device determines whether or not the mobile device is present inside an area containing the vehicle interior space and having a boundary surface following at least one side surface in the width direction of the vehicle, based on received signal strengths of signals transmitted from the first transmitting antenna and the second transmitting antenna.
