| 摘要 |
A radar that detects whether spike noise due to an interference with a transmission signal from an object vehicle is superimposed on a beat signal obtained from the transmission signal and a reception signal. When the spike noise is detected, a threshold for extracting a peak from a frequency spectrum is temporarily increased. Normally, a threshold (TH 0 ) is set not so as to extract background noise as a target peak. When the spike noise is detected, a noise floor level (NFL) of the frequency spectrum is determined on the basis of the maximum absolute value of the spike noise, and a threshold (TH 1 ) higher by a predetermined amount DeltaL than the threshold TH 0 is set. This allows a proper target peak to be accurately extracted without mistakenly extracting many peaks caused by the noise as the target peaks.
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