Patent ID: 7339518

Claim:
An FMCW radar device, comprising: a transmission signal generation unit for generating a transmission signal at a frequency increasing in a first interval and decreasing in a second interval; a radar wave transmission unit for transforming the transmission signal into a transmission radar wave and for transmitting the transmission radar wave; a reception unit for receiving a reflected radio wave coming from a target object reflecting the transmission radar wave and for generating a reception signal from the reflected radio wave; a beat signal generation unit for generating a first interval beat signal and a second interval beat signal, the first interval beat signal indicating a frequency difference between the transmission signal and the reception signal in the first interval, the second interval beat signal indicating a frequency difference between the transmission signal and the reception signal in the second interval; a frequency analysis unit for specifying, by executing frequency analysis, a first peak frequency of the first interval beat signal and a second peak frequency of the second interval beat signal, wherein amplitude of the first interval beat signal reaches a local maximum at the first peak frequency and amplitude of the second interval beat signal reaches a local maximum at the second peak frequency; a distance/velocity calculation unit for calculating based on the first and second peak frequencies a distance to the target object from the FMCW radar device and a relative velocity of the target object to the FMCW radar device; a sum calculation unit for calculating a value related to a sum of intensities of frequency components of one of the first interval beat signal and the second interval beat signal, the frequency components within a high frequency range exceeding a frequency range corresponding to a target detection distance range within which the target object is to be detected; and a determination unit for making, based on the value related to the sum, a determination whether another radar device is interfering with the reflected radio wave.