Patent ID: 6657582
Filing Date: 2003-12-02
Classification: G01S

Abstract:
A radar apparatus comprising:a sending/receiving unit having an antenna and sending from the antenna a sending signal that has been frequency modulated by a triangular wave signal, the sending/receiving unit mixing a signal received from the antenna and a local signal branched off from the sending signal to generate a beat signal; a frequency analyzing unit analyzing the frequency of the beat signal for each rise zone and each fall zone of the frequency modulated by the triangular wave signal; an accumulation unit accumulating a plurality of frequency power spectra by frequency analysis at least for each rise zone; a judgment unit judging the presence of a valley section within a peak section, as a characteristic section from the plurality of frequency power spectra accumulated in the accumulation unit; a peak frequency extraction unit acquiring, as beat frequencies of different targets, respective beat frequencies of peak sections located at both sides of the characteristic section judged by the judgment unit; and an operation unit calculating the distance to a target and the relative speed thereto, based on the beat frequencies.