Patent ID: 9547077
Date: 2017-01-17
CPC Classifications: G01S

Claim:
1. A dual-frequency CW radar apparatus comprising: emitting means that emits radar waves of different frequencies according to a first and second transmission signals having the different frequencies; receiving and outputting means that is provided with a plurality of antenna elements capable of receiving reflected waves of the radar waves and outputs, as received signals of each of the plurality of antenna elements, a first received signal including reflection components of a radar wave that conforms to the first transmission signal, and a second received signal including reflection components of the radar wave that conforms to the second transmission signal; transforming means that generates, for each of the plurality of antenna elements, first frequency data by transforming the first received signal outputted from the receiving and outputting means from a temporospatial signal to frequency-spatial data, and second frequency data by transforming the second received signal outputted from the receiving and outputting means from a temporospatial signal to frequency-spatial data; peak detecting means that detects a peak frequency corresponding to a frequency of the reflection components included in the first and second received signals, on the basis of the first and second frequency data generated by the transforming means; observing means that at least detects a distance to a target that has generated the reflected waves corresponding to the peak frequency, on the basis of phase information of the first and second received signals corresponding to the peak frequency detected by the peak detecting means; eigenvalue calculating means that calculates a second eigenvalue of a correlation matrix: Ry=[y judging means that judges whether or not the reflection components corresponding to the peak frequency are synthetic components of the reflected waves from a plurality of targets, on the basis of the magnitude of the second eigenvalue calculated by the eigenvalue calculating means; and inhibiting means that inhibits a distance from being detected by the observing means on the basis of phase information of the first and second received signals corresponding to the peak frequency of which the reflection components have been judged as being the synthetic components by the judging means.