Position determination system
AssigneesDenso Corporation, Soken, Inc.
InventorsHidenori Osai, Kenichiro Sanji, Taichi Yamaguchi, Kazunari Nakamura, Munenori Matsumoto, Takashi Shinoda
Life of this patent
Estimating the term…
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.
Claims27
A position determination system for determining a position of a mobile terminal, comprising:
- a vehicle interior receiver configured to receive a radio signal transmitted from the mobile terminal using a radio wave in a predetermined frequency band through a vehicle interior antenna installed in a vehicle compartment of a vehicle;
- a vehicle interior strength detector configured to detect a reception strength of the radio signal received by the vehicle interior receiver as a vehicle interior strength;
- a vehicle exterior antenna configured to receive the radio signal arriving from a vehicle exterior;
- a vehicle exterior receiver configured to receive the radio signal transmitted from the mobile terminal through the vehicle exterior antenna;
- a vehicle exterior strength detector configured to detect a reception strength of the radio signal received by the vehicle exterior receiver as a vehicle exterior strength;
- and
- a position determination unit configured to determine whether the mobile terminal is present outside the vehicle compartment based on the vehicle interior strength detected by the vehicle interior strength detector and the vehicle exterior strength detected by the vehicle exterior strength detector, wherein
- the vehicle exterior antenna is disposed in a predetermined region in a vicinity of a window of the vehicle in an outer surface portion of the vehicle,
- a frequency of the radio signal is 1 GHz or more, and
- the predetermined region is set to a region in which the distance from the window is 1 time or less of the wavelength of the radio wave.
A position determination system for determining a position of a mobile terminal by performing a wireless communication with the mobile terminal, the position determination system comprising:
- a vehicle interior communication device configured to be installed in a vehicle compartment of a vehicle, receive a radio signal transmitted from the mobile terminal, and detect a reception strength of the received radio signal;
- a vehicle exterior communication device configured to be installed on an outer surface of the vehicle, receive the radio signal transmitted from the mobile terminal, and detect a reception strength of the received radio signal;
- and
- a position determination unit configured to determine a position of the mobile terminal based on at least one of an interior unit strength that is the reception strength detected by the vehicle interior communication device, and an exterior unit strength that is the reception strength detected by the vehicle exterior communication device, wherein
- the position determination unit is configured to determine that the mobile terminal is present in the vehicle compartment based on a condition that the interior unit strength is equal to more than a predetermined interior equivalent value for determining that the mobile terminal is present in the vehicle compartment, and the exterior unit strength is less than a predetermined exterior equivalent value for determining that the mobile terminal is present outside the vehicle compartment.
Dependencies are inferred from the claim text.