| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus and method for estimating a radio wave arrival angle capable of uniquely estimating an arrival angle of a received radio wave even if a distance between antenna elements cannot be reduced to a predetermined distance or shorter. SOLUTION: An array antenna includes at least three antenna elements 11, 12 and 13. The three antenna elements are installed so that a difference between a distance d2 between the antenna elements 12 and 13 and a distance d1 between the antenna elements 11 and 12 may be equal to or less than a half wavelength of the received radio wave. An arrival angle estimating part 60 estimates the arrival angle of the received radio wave by calculating a difference between a phase differenceϕ1 of the received radio wave by the antenna elements 11 and 12 and a phase differenceϕ2 of the received radio wave by the antenna elements 12 and 13. COPYRIGHT: (C)2011,JPO&INPIT
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