Vehicle communication system, in-vehicle device, portable device, and computer program

Abstract

In the vehicle communication system provided with the in-vehicle device for transmitting and receiving signals using the plurality of antennas, which are provided in different positions in the vehicle, and the portable device for transmitting and receiving the signals, the in-vehicle device: stores statistical values derived by measuring in advance received signal strengths of signals transmitted from a part of the plurality of antennas in association with information identifying antennas of transmission sources, for each of the inside and the outside of a vehicle cabin of measured positions; detects an antenna having a failure; calculates, for inside and outside the vehicle cabin, the statistical distance between the measured received signal strength and the statistical values corresponding to the selected antennas; makes a comparison between the results of the calculation; and determines whether the portable device is inside or outside the vehicle cabin.