Radar device and azimuth angle detecting method

An electronic scanning radar device detects an azimuth angle on the basis of the phase difference of a first receiving wave pair received by a first antenna pair spaced at predetermined intervals and combines the first receiving wave pair to generate a first composite wave. The composite wave is larger in level variations than in azimuth angle variations and has a steep antenna pattern. So the radar device has an azimuth angle judging means for making a right and wrong judgment in which the azimuth angle is right when the level of the first composite wave in the azimuth angle is not less thana reference value, and in which the azimuth angle is wrong when the level of the first composite wave in the azimuth angle is less than the reference value. Thereby, even if the level of the composite wave is displaced upward, a composite wave by means of the receiving wave from a target outside a phase reflection section cannot exceed the threshold of the right and wrong judgment to allow for anaccurate right and wrong j