Patent ID: 7336218

Claim:
A radar system comprising: a transmitter portion transmitting a transmission signal subjected to frequency modulation and generating a beat signal including a frequency component corresponding to a difference in frequency between the transmission signal and a reflection signal from a target to which the transmission signal is transmitted; a frequency analyzer sampling the beat signal and applying a window function to sampled data to yield a discrete frequency spectrum; a processor yielding a peak frequency of a peak appearing in the frequency spectrum due to the reflection signal; and a target detector detecting the target on the basis of the peak frequency, wherein the frequency analyzer selectively applies, as the window function, a plurality of window functions having amplitudes that are differently attenuated from a center of a sampling period toward both sides thereof, and wherein a window function having an amplitude that is gently attenuated from the center of the sampling period toward both sides thereof is applied to a first frequency band in the frequency spectrum to yield the frequency spectrum, and a window function having an amplitude that is sharply attenuated from the center of the sampling period toward both sides thereof is applied to a second frequency band in the frequency spectrum to yield the frequency spectrum, the second frequency band being higher than the first frequency band.