Patent ID: 6384769
Filing Date: 2002-05-07
Classification: G01S

Abstract:
A radar apparatus comprising:transmitting means for transmitting a transmission wave of a continuous wave whose modulating frequency ascends or descends to a target; receiving means for receiving a reception wave reflected from said target; beat signal producing means for producing a beat signal having a frequency corresponding to a frequency difference between said transmission wave and said reception wave reflected from said target; fast Fourier-transform processing means for acquiring a frequency spectrum of said beat signal; beat frequency detecting means for detecting the frequencies of the targets in both a modulating frequency ascent period and a modulating frequency descent period; discrimination target reference spectrum setting means for inputting thereinto a frequency spectrum of a modulating frequency ascent period and a frequency spectrum of a modulating frequency descent period so as to set a reference spectrum employed when a moving target is discriminated from a stationary target; discrimination target beat frequency detecting means for detecting the reference beat frequencies of either the moving targets or the stationary targets based upon said reference spectrum; combination seeking means for entering thereinto the beat frequencies of the targets in the modulating frequency ascent period and the modulating frequency descent period from said beat frequency detecting means so as to form a combination seeking table, and for removing from a seeking object, a component other than the reference beat frequencies of either the moving targets or the stationary targets from said discrimination target beat frequency detecting means within said combination seeking table, to output; and distance/speed calculating means for calculating the distance of the targets and the speeds thereof based upon the beat frequencies from said combination seeking means.