Patent ID: 6339395
Filing Date: 2002-01-15
Classification: G01S

Abstract:
A radar apparatus comprising:a transmitter providing a transmit signal having a preselected frequency to produce an output signal to be transmitted as a radar wave to a radar detectable zone; an array of receiving antennas; a plurality of receivers each of which mixes an input signal that is a return of the radar wave from a target object received by one of said receiving antennas with a local signal having the same frequency as that of the transmit signal to produce a single beat signal including a frequency component corresponding to a difference in frequency between the output signal and the input signal; and a signal processing circuit forming beams, made of components of the beat signals, corresponding to angular directions predetermined in the radar detectable zone, said signal processing performing complex Fourier Transform twice on the beat signals in time series and space series along the array of said receiving antennas to derive results of frequency analysis in units of the beams.