RADAR DEVICE AND AZIMUTH ANGLE DETECTING METHOD

An electronic scanning radar device detects an azimuth angle of a target based on a phase difference between a first pair of received waves received by a first pair of antennas separated by a prescribed distance, and combines the first pair of received waves and generates a first composite wave. The composite wave has a steep antenna pattern, for which the amount of level change is large for the amount of change in azimuth angle, and an azimuth angle judgment unit performs true/false judgment in which a detected azimuth angle is judged to be true when the level of the above first composite wave is equal to or above a reference value, and the azimuth angle is judged to be false when the level is below the reference value. Hence even when the composite wave level is displaced upward, the level of the composite wave of a received wave from a target outside the phase wrapping interval does not exceed the threshold value for true/false judgment. Hence, true/false judgments can be performed accurately. Hence even when the antenna pattern is displaced according to the reflection cross-sectional area of the target, true/false judgments of detected azimuth angles based on the level of the received wave can be performed accurately.