Matsushita Electric Industrial Co., Ltd.

Masayuki Hamada, Deceased

Tsuyoshi Okada

Hisashi Kurokawa

Junji Hamada, Legal Representative

A relative distance and relative velocity to a target object is accurately estimated even if an error in slopes of the triangular wave modulation, that is unbalanced upward and downward slopes, or error in absolute values in an FMCW radar exists. A first distance estimator estimates a distance up to the target object based on a sum of a beat wave frequency generated between the upward and downward slopes of the triangular wave and an absolute value of an average frequency modulation factor which is a mean value of frequency modulation factors for the upward and downward slopes of the triangular wave, and a first velocity estimator estimates a relative velocity to the target object based on a time difference of the calculated distance. A tentative frequency modulation factor estimator estimates an absolute value of a tentative frequency modulation factor based on the calculated distance and velocity, and then estimates a more accurate relative velocity to the target object based on the estimated absolute value of the tentative frequency modulation factor and the distance calculated by the first distance estimator.

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Tokyo, Japan

Masayuki Hamada, Deceased