Patent ID: 11899096
Assignee: DENSO CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  H  B  E | IPC B  G  H

Claim 9:
10. A transmission control method executed by a transmission control device, which is mounted on a vehicle and drives a plurality of antennas to detect a position of a portable device relative to the vehicle using a wireless communication between the portable device and the plurality of antennas, the plurality of antennas being arranged at respective positions of the vehicle and having different transmission ranges from one another, and the portable device being carried by a user, the transmission control method comprising:
transmitting, with use of a carrier wave from a genuine transmission antenna, a genuine code that activates the portable device, and the genuine transmission antenna being one of the plurality of antennas; and
transmitting, with use of a carrier wave from an inversion transmission antenna, an inversion code including at least partial inverted genuine code concurrently with a transmission of the genuine code from the genuine transmission antenna, and the inversion transmission antenna being one of the plurality of antennas and having a transmission range that does not overlap with a transmission range of the genuine transmission antenna.