Vehicle unit and positional relationship identification system
AssigneeDenso Corporation
InventorsYouhei Sekiya, Kenichiro Sanji, Yuuji Kakuya
Life of this patent
Estimating the term…
Abstract
A vehicle unit installable and usable in a vehicle, includes, at least one vehicle antenna transmitting and receiving a high-frequency signal, which is a signal carried on a high-frequency radio wave, and the vehicle antenna includes, a vertically polarized wave antenna capable of transmitting and receiving a polarized wave orthogonal to a target surface, which is a metal surface at a predetermined part of the vehicle, and first and second horizontally polarized wave antennas each capable of transmitting and receiving polarized waves that are horizontal to the target surface and mutually orthogonally polarized.
Claims10
A vehicle unit installable and usable in a vehicle, the vehicle unit comprising:
- an antenna portion configured to transmit and receive a high-frequency signal carried on a high-frequency radio wave, the high-frequency radio wave being a radio wave of 1 GHz or higher, wherein
- the antenna portion at least includes
- a vertically polarized wave antenna configured to transmit and receive a polarized wave orthogonal to a target surface, which is a metal surface of a predetermined part of the vehicle, and
- one or two horizontally polarized wave antennas configured to transmit and receive polarized waves that are horizontal to the target surface and orthogonal to each other,
- the vehicle unit further comprising:
- a positional relationship identification unit configured to identify a positional relationship of a portable device with respect to the vehicle, which is configured to transmit the high-frequency signal, with respect to the vehicle, by using the high-frequency signal received by the antenna portion, the positional relationship of the portable device with respect to the vehicle being a distance between the antenna portion provided on the vehicle and the portable device;
- and
- a reception strength determination unit configured to determine an antenna having a highest reception strength of a same high-frequency signal from among the antennas of the antenna portion, wherein
- the positional relationship identification unit is configured to identify the positional relationship of the portable device with respect to the vehicle by using only the high-frequency signal received by the antenna, which is determined by the reception strength determination unit to have the highest reception strength among the antennas included in the antenna portion.
Dependencies are inferred from the claim text.