Patent ID: 7474252
Filing Date: 2009-01-06
Classification: G01S

Abstract:
1. A radar device using a transmission signal outputted from a transmission antenna and a reception signal as an incoming wave reflected from a target object through an arrangement of reception antennas for estimating an angle of the incoming wave comprising: a beat signal generation means for generating a beat signal from a difference of the transmission signal and the reception signal in a frequency element; a self-correlation matrix calculation means for calculating a self-correlation matrix based on the beat signal; an eigenvalue calculation means for calculating an eigenvalue using the self-correlation matrix; and an incoming wave estimation means for estimating a number of the incoming wave, wherein the incoming wave estimation means stores a threshold eigenvalue for each beat frequency of the beat signal, and the incoming wave estimation means distinguishes the incoming wave in a signal space from the incoming wave in a non-signal space by dividing the eigenvalue into two parts representing the signal space and the non-signal space using the threshold eigenvalue for estimating the number of the incoming wave.