Patent ID: 6229474
Filing Date: 2001-05-08
Classification: G01S

Abstract:
A radar apparatus comprising:transmitting means for outputting a transmission electromagnetic wave;receiving means for IQ-phase-detecting a reception electromagnetic wave received when the transmission electromagnetic wave is reflected from a target object and returned from the target object;signal converting means for converting an output signal of said receiving means into data indicated by a relationship between a frequency and an amplitude level of the output signal, from which a frequency spectrum is revealed; andsignal processing means in which if there are one pair of spectrums having positive and negative peak values of amplitude levels, while absolute values of frequencies thereof are identical to each other, among the data converted by said signal converting means, then it is judged that a spectrum having a large peak value of an amplitude level is a true spectrum, and both a distance and a relative speed between the target object and said radar apparatus are calculated by employing the frequency of the judged true spectrum.