Patent ID: 8638254

Claim:
A signal processing device that performs object detection processing in which peak signals each representing a differential frequency between a transmitted signal in which a frequency thereof changes in a predetermined cycle and a received signal obtained by receiving a reflected wave of a transmitted wave based on the transmitted signal from an object are derived in a first period where the frequency of the transmitted signal rises and a second period where the frequency of the transmitted signal falls, and the peak signals in the first period are paired with the peak signals in the second period to detect object information related to the peak signals, the signal processing device comprising: a range setting unit that sets a frequency range in each of the first period and the second period on the basis of a frequency of twice the peak signal related to the object information which has been detected in previous object detection processing; a signal setting unit that sets a peak signal as a specific peak signal in a case where the peak signal is within the frequency range in each of the first period and the second period; and a paring unit that pairs the specific peak signal in the first period and the specific peak signal in the second period.