Importance

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Abstract

A wide angle of a range of a field of view of a radar is handled with a wider reception interval. There is provided a radar system which converts a reception signal into digital data using a receiving array to perform sensing through arithmetic processing, the radar system including: the receiving array composed of three or more receiving systems; and at least two transmitting antennas having directional properties each of which is in horizontal symmetry and which are different in beam width, wherein the transmitting antennas different in directional property alternately perform transmissions, and a region of an arrival wave is determined based on a difference in measurement between reception levels corresponding to the individual transmissions. Defining a range in which a measurement of a propagation path length difference between adjacent receiving systems is less than a half-wavelength as a main region and outsides thereof as outside regions, in the case of the arrival wave from the outside regions, the arrival wave is determined to be from the outside region on a horizontally opposite side to a measured orientation to calculate an orientation in accordance with relation between an angle measurement value and an arrival angle in the outside region. Thereby, an angle range within which a sensing coinciding with the arrival angle is obtained is expandable from a conventional main region to a range within which the measurement of the propagation path length difference between the adjacent receiving systems is less than one wavelength.

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