| 摘要 |
PROBLEM TO BE SOLVED: To provide a wireless installation in a keyless entry system, for instance, which can carry out determination of location of a portable machine (determination from inside and outside of a cabin) with high reliability. SOLUTION: According to the wireless installation, by carrying out control of an in-vehicle machine (main body machine) 20, portable machine searching signals are transmitted from a plurality of antennas 22, 23, arranged inside and outside the cabin, for a plurality of times, and the location of the portable machine 10 is determined based on reception frequency data of the portable machine searching signals received by the portable machine 10. More specifically, the in-vehicle machine 20 carries out determination, as appropriate, that the portable machine 10 is present in a communication set range of an antenna from which the portable machine receives the searching signals most frequently. |
