Patent ID: 8760341

Claim:
A radar device, comprising: a transmission part that radiates a transmission signal having four modulation sections as a transmission wave; a reception part that receives a reflected wave resulting from reflecting the transmission wave by a target as a reception signal; a mixing part that mixes the transmission signal and the reception signal together to generate a beat signal; and a target detection part that calculates a distance to the target and a relative velocity to the target based on the beat signal, wherein the target detection part comprises: a peak frequency extraction part configured to extract peak frequencies in the respective four modulation sections from the beat signal that has been analyzed in frequency; a first pair distance/relative velocity calculation part configured to pair the peak frequencies in two modulation sections of the four modulation sections among the peak frequencies extracted by the peak frequency extraction part to generate a first pair, and calculate the distance and the relative velocity of the first pair; a second pair distance/relative velocity calculation part configured to pair the peak frequencies in another two modulation sections different from the two modulation sections among the peak frequencies extracted by the peak frequency extraction part to generate a second pair, and calculate the distance and the relative velocity of the second pair; a target decision part configured to decide the distance to the target and the relative velocity to the target when the distance and the relative velocity of the first pair are equal to the distance and the relative velocity of the second pair, respectively; and a target estimation part configured to estimate a distance to the target and a relative velocity to the target based on a distance to the target and a relative velocity to the target, which have been decided by the target decision part in a previous cycle, when at least one of the peak frequencies of the beat signal cannot be extracted and the pair of the peak frequencies cannot be generated.