VEHICULAR NEAR FIELD COMMUNICATION SYSTEM, PORTABLE DEVICE, AND ON-BOARD INSTRUMENT

摘要

This vehicular near field communication system has a configuration where a portable device receives a first signal and a second signal respectively transmitted from a vehicle-exterior antenna and a vehicle-interior antenna of an on-board instrument mounted in a vehicle, measures a first received signal strength from the first signal, measures a second received signal strength from the second signal, adds an offset to the second received signal strength, and transmits a response signal to the on-board instrument in accordance with the first received signal strength and the second received signal strength added with the offset, so as to be able to prevent a portable device from being locked in a cabin even though the portable device is shielded by a metal in the cabin.

主权项

1. A vehicular near field communication system comprising:
an on-board instrument having a vehicle-exterior antenna and a vehicle-interior antenna, the on-board instrument being mounted in a vehicle; and a portable device performing radio communications with the on-board instrument, the portable device comprising
receiver for receiving a first signal transmitted from the vehicle-exterior antenna and a second signal transmitted from the vehicle-interior antenna,measure for measuring a first received signal strength from the first signal and a second received signal strength from the second signal,offset adder for adding an offset to the second received signal strength, andtransmitter for transmitting a response signal to the on-board instrument in accordance with the first received signal strength and the second received signal strength added with the offset.