TIRE INFORMATION MONITORING APPARATUS

摘要

PROBLEM TO BE SOLVED: To accurately specify an arrangement azimuth of a tire transmitting a signal in a tire information monitoring apparatus. SOLUTION: The changing of the azimuth of directivity in which the azimuth of directivity of an antenna is discretely switched to the azimuths of tires successively is performed repeatedly for a plurality of cycles during transmission duration of information. The output value of the antenna whose azimuth of directivity is controlled is sampled separately for each of the azimuths of directivity subjected to the switching. The sampled values are sorted into groups separately for each azimuth of directivity, and are accumulated separately for each group. The information is determined as being the information transmitted from the tire in the position shown by the azimuth of directivity of the group whose accumulated value is the largest. COPYRIGHT: (C)2011,JPO&INPIT