Patent 7091900 was granted and assigned to Hitachi on August, 2006 by the United States Patent and Trademark Office.
A radar of the present invention has: (1) an antenna unit for transmitting a radio wave and receiving a reflected wave of the radio wave; (2)rotating means for rotating the antenna unit about an axis along a direction of transmitting the radio wave; and (3) control means for detecting an azimuth of a target from the reflected wave, the azimuth using the axis as a reference and being defined in a plane determined from a posture of the antenna unit and the axis.