Patent ID: 7432849
Filing Date: 2008-10-07
Classification: G01S

Abstract:
1. A frequency modulation radar apparatus for vehicle use which sends a transmission signal the frequency of which is frequency modulated so as to linearly rise or fall in accordance with the elapse of time, receives the signal reflected by a target object, samples a beat signal that is obtained by mixing the reception signal thus received with said transmission signal, performs a discrete frequency analysis by using a predetermined window function, extracts a peak signal from a spectrum of said beat signal obtained, and calculates a distance or a relative speed to said target object based on a frequency (f n ) of said peak signal, said apparatus comprising: a frequency correction section that adds an amount of frequency correction (δ) to said frequency (f a CPU that calculates the distance or relative speed to said target object based on said corrected frequency (f wherein by using a strength (a when said strength (a