The present invention relates to a method for detecting whether or not an ambiguity has arisen in a direction detecting apparatus by comparing phases and includes at least three antennas arranged at different intervals and detecting antennas for detecting phases of a radio signal received from each antenna And calculating at least two phase differences from the selected phases from at least two of the two phases to calculate the phase difference from each other from the antenna section and calculating at least two phase differences from the selected phases, And a phase difference calculating unit for calculating arrival angles of radio signals corresponding to the phase differences of the phases detected from the antennas corresponding to the array intervals and the array intervals between the at least two antennas, From at least one look-up table including the calculated information, An arrival angle estimation unit for estimating an arrival angle of a radio signal corresponding to one phase difference set and a direction detection ambiguity detection unit for detecting whether or not direction detection ambiguity has occurred using at least one estimated arrival angle .
展开▼
