| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a millimeter wave radar device for improving detecting accuracy of a stationary object. SOLUTION: This millimeter wave radar device is provided with a transmission antenna 110 for radiating a radio wave, a receiving antenna 111 for receiving a reflected wave from an object of the radio wave radiated from the transmission antenna 110, an A/D converter 114 for converting a beat signal of a received signal into a digital signal by sampling the beat signal, an FFT part 102 for analyzing the whole frequency area of data sampled by the A/D converter by fast Fourier transform, and a Zoom FFT part 103 for analyzing a frequency area in the vicinity of one's own vehicle speed by the fast Fourier transform among the data sampled by the A/D converter. A vehicle speed self- diagnosable logic part 170 compares one's own vehicle speed converted from a Doppler frequency of the stationary object with one's own vehicle speed obtained from a vehicle speed sensor, and diagnoses whether or not an error falls within a prescribed range, and analyzes the frequency area in the vicinity of the one's own vehicle speed by the fast Fourier transform by the Zoom FET part 103 when the error falls within the prescribed range.</p> |
