Radar device, signal processing device for radar device, and signal processing method

A signal processor for a radar device comprising at least one hardware processor that is configure to:

• decompose each of respective beat signals generated from respective reception signals obtained by receiving reflected waves of a transmission wave from a target by a plurality of antennae, and a transmission signal of the transmission wave, into a plurality of frequency components;
• a specify arrival angles of reflected-wave signals on the basis of peak frequency components included in the plurality of frequency components obtained by decomposing each of the beat signals, and to calculate the signal intensities of arrival angle components of the reflected waves with respect to a plurality of neighborhood frequency components of the peak frequency components in a case where the plurality of arrival angles of the reflected-wave signals are specified;
• and
• select one frequency component having the highest signal intensity from among the plurality of neighborhood frequency components of the peak frequency components, with respect to each of the arrival angles specified at a plurality of frequencies, and compute a distance between the radar device and the target on the basis of the one frequency component selected with respect to each of the arrival angles.

A signal processing method comprising:

• decomposing each of respective beat signals generated from respective reception signals obtained by receiving reflected waves of a transmission wave from a target by a plurality of antennae, and a transmission signal of the transmission wave, into a plurality of frequency components;
• specifying arrival angles of reflected-wave signals on the basis of peak frequency components included in the plurality of frequency components obtained by decomposing each of the beat signals;
• in a case where the plurality of arrival angles of the reflected-wave signals are specified, calculating the signal intensities of arrival angle components of the reflected waves with respect to a plurality of neighborhood frequency components of the peak frequency components;
• selecting one frequency component having the highest signal intensity from among the plurality of neighborhood frequency components of the peak frequency components, with respect to each of the arrival angles specified at a plurality of frequencies;
• and
• computing a distance between the radar device and the target on the basis of the one frequency component selected with respect to each of the arrival angles.