Patent ID: 8085184
Filing Date: 2011-12-27
Classification: G01S

Abstract:
1. A radar device comprising: a transmission means for generating a transmission signal whose frequency periodically increases and decreases in a constant modulation width, and for radiating the transmission signal into space; a reception means for acquiring a reception signal by receiving a reflected signal of the transmission signal by a target, and for generating a beat signal by mixing the reception signal with the transmission signal; a beat-frequency generating means for obtaining a first beat-frequency distribution from the beat signal at the time of up-chirping in which the frequency of the transmission signal ascends so as to determine a frequency peak in the first beat-frequency distribution, and for obtaining a second beat-frequency distribution from the beat signal at the time of down-chirping in which the frequency of the transmission signal descends so as to determine a frequency peak in the second beat-frequency distribution; an up-chirp beat-frequency tracking means for performing tracking processing on a frequency peak in the first beat-frequency distribution over a span of a plurality of up-chirping time-intervals, and for generating first beat-frequency time-series data from the frequency peak whose correlation is obtained by the tracking processing; an up-chirp target-detection means for calculating a first range and range-change rate to the target from the first beat-frequency time-series data; a down-chirp beat-frequency tracking means for performing tracking processing on a frequency peak in the second beat-frequency distribution over a span of a plurality of down-chirping time-intervals, and for generating second beat-frequency time-series data from the frequency peak whose correlation is obtained by the tracking processing; and a down-chirp target-detection means for calculating a second range and range-change rate to the target from the second beat-frequency time-series data.