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

Claim 12:
13. A computer readable non-transitory tangible medium storing a control program product, the control program product comprising instructions for controlling a computer to be implemented as a transmission control device,
wherein
the transmission control device is mounted on a vehicle and drives a plurality of antennas to detect a position of the portable device relative to the vehicle using a wireless communication between the portable device and the plurality of antennas,
the plurality of antennas are arranged at respective positions of the vehicle and have different transmission ranges from one another, and the portable device is carried by a user, and
the control program further comprises instructions that control the transmission control device to function as a processor and memory configured to:
control a first transmission antenna to transmit, with use of a carrier wave, a genuine code that activates the portable device and a first burst signal following the genuine code, and the first transmission antenna being one of the plurality of antennas; and
control a second transmission antenna to transmit, with use of a carrier wave, a second burst signal having a 180 degrees shifted phase from the first burst signal concurrently with a transmission of the first burst signal from the first transmission antenna, and the second transmission antenna being one of the plurality of antennas and having a transmission range that does not overlap with a transmission range of the first transmission antenna.