Patent ID: 7202810
Filing Date: 2007-04-10
Classification: G01S

Abstract:
1. A radar apparatus adapted to send and receive radar beams as a transmitted signal and a received signal, respectively, while changing the direction of an antenna so as to change the direction of said radar beams with respect to said antenna, observe beat signals created by mixing said transmission and received signals frequency modulated of up phases and down phases with each other, detect a target to be observed, and measure observation data including a relative distance, a relative velocity or an azimuth angle of said target with respect to said antenna, said apparatus comprising: an antenna direction control part that turns said radar beams in a plurality of preset directions; a frequency analysis section that extracts a beat frequency and a spectral amplitude value corresponding to said target from said beat signals in radar beams of predetermined directions; a distance and velocity calculation section that calculates the distance and velocity of said target based on said beat frequency in a radar beam of a predetermined direction; a same target search section that searches for the distance and velocity of the same target observed in two of said radar beams of different directions from the distances and velocities of targets calculated in said two radar beams; an azimuth angle calculation section that calculates the azimuth angle of said same target based on the spectral amplitude values of said same target observed in said two radar beams: and an azimuth angle determination section that selects an output content of said observation data concerning a target to be detected based on the azimuth angle of said same target calculated in said two radar beams.