Abstract: A position determination system a determines whether a mobile terminal is present outside a vehicle compartment based on a reception strength of a radio signal transmitted from the mobile terminal through a vehicle interior antenna and a reception strength of a radio signal transmitted from the mobile terminal through a vehicle exterior antenna, and the vehicle exterior antenna is configured to be disposed in a predetermined region in a vicinity of a window of a vehicle in an outer surface portion of a vehicle.

Abstract: A road surface state determination device includes a tire-side device and a vehicle-body-side system. The tire-side device is attached to each of a plurality of tires included in a vehicle. The vehicle-body-side system is included in a body of the vehicle. The tire-side device may output a detection signal corresponding to a magnitude of vibration applied to the tire. The tire-side device may extract data items of a road surface state indicative of the vibration of the tire during one rotation of the tire from the detection signal. The tire-side device may generate road surface data. The tire-side device may transmit the road surface data. The vehicle-body-side system may receive the road surface data. The vehicle-body-side system may determine the road surface state based on the road surface data.

Abstract: In a vehicle, a vehicle body-side apparatus is configured to perform a main area determination and an auxiliary area determination. The main area determination determines whether a portable terminal is present in a main area based on a first reception intensity measured by the vehicle body-side apparatus in a wireless signal from the portable terminal. The auxiliary area determination determines whether the portable terminal is present in an auxiliary area based on a second reception intensity measured by a vehicle tire-side apparatus in a wireless signal from the portable terminal.

Abstract: In a vehicle, a vehicle body-side apparatus is configured to perform a main area determination and an auxiliary area determination. The main area determination determines whether a portable terminal is present in a main area based on a first reception intensity measured by the vehicle body-side apparatus in a wireless signal from the portable terminal. The auxiliary area determination determines whether the portable terminal is present in an auxiliary area based on a second reception intensity measured by a vehicle tire-side apparatus in a wireless signal from the portable terminal.

Abstract: A road surface state determination device includes a tire-side device and a vehicle-body-side system. The tire-side device is attached to each of a plurality of tires included in a vehicle. The vehicle-body-side system is included in a body of the vehicle. The tire-side device may output a detection signal corresponding to a magnitude of vibration applied to the tire. The tire-side device may extract data items of a road surface state indicative of the vibration of the tire during one rotation of the tire from the detection signal. The tire-side device may generate road surface data. The tire-side device may transmit the road surface data. The vehicle-body-side system may receive the road surface data. The vehicle-body-side system may determine the road surface state based on the road surface data.

Abstract: A position determination system a determines whether a mobile terminal is present outside a vehicle compartment based on a reception strength of a radio signal transmitted from the mobile terminal through a vehicle interior antenna and a reception strength of a radio signal transmitted from the mobile terminal through a vehicle exterior antenna, and the vehicle exterior antenna is configured to be disposed in a predetermined region in a vicinity of a window of a vehicle in an outer surface portion of a vehicle.