Radar device

A radar device comprising:

• processing circuitry to
• generate a radar signal whose frequency changes, over time, nonlinearly with respect to the time;
• output the generated radar signal as a reference wave, transmit the radar signal to a target, and receive a returning radar signal reflected from the target as a reflected wave;
• detect a beat signal indicating a difference frequency between a frequency of the output reference wave and a frequency of the received reflected wave, and convert the beat signal into a digital signal from an analog signal;
• and
• calculate a distance correspondence value corresponding to the distance to the target from the converted digital signal and calculate the distance to the target from the distance correspondence value,
• generate, as a replica signal of the digital signal, a signal having a sampling period same as a sampling period of the beat signal upon conversion of the beat signal from an analog signal into the digital signal;
• calculate an inner product of the converted digital signal and the generated replica signal;
• calculate, as the distance correspondence value corresponding to the distance to the target, an absolute value of the calculated inner product;
• and
• calculate the distance to the target from the calculated absolute value.