Patent ID: 9696415
Date: 2017-07-04
CPC Classifications: G01S

Claim:
1. A radar apparatus which transmits a transmission wave toward an object and receives a reception wave which is the transmission wave reflected by the object, wherein the radar apparatus is a FM-CW radar apparatus for calculating a distance to the object based on a difference frequency between the transmission wave and the reception wave, the radar apparatus, comprising: a beat signal generator for generating a beat signal having the difference frequency between the transmission wave and the reception wave; a first spectrum calculator for performing Fourier transformation on the beat signal output from the beat signal generator, and calculating a first frequency spectrum indicating a relationship between a reception wave intensity and the frequency; a grouping section which groups a plurality of peaks of the first frequency spectrum on an object-by-object basis; a change amount calculator for obtaining, for each of a plurality of peaks belonging to a group, a peak value corresponding to the intensity value of the reception wave at the present point in time, comparing the peak value with a peak value obtained at the past point in time before the present point in time, and calculating a change amount indicating a time variation of each peak value; a ratio calculator for comparing the change amount with a predetermined change amount threshold and calculating a ratio of the number of peaks whose change amounts are greater than the change amount threshold to the total number of the plurality of peaks belonging to the same group; and a pedestrian determination section for determining that the object is a pedestrian when the ratio calculated by the ratio calculator is greater than a predetermined ratio threshold and at least one of the plurality of peaks belonging to the same group differs from the remaining peaks in terms of the plus or minus sign of the difference between the peak value at the present point in time and the peak value at the past point in time before the present point in time.