Patent ID: 6040796
Filing Date: 2000-03-21
Classification: G01S

Abstract:
A radar system comprising:transmitting signal generating means for producing a high-frequency transmitting signal which is carried on a radar wave, said transmitting signal being frequency modulated in accordance with a linear modulation component and a cyclic modulation component, the transmitting signal generating means includingfirst component generating means for producing said linear modulation component, the linear modulation component varying a frequency of said transmitting signal linearly relative to time,second component generating means for producing said cyclic modulation component, the cyclic modulation component varying said frequency of said transmitting signal cyclically at a cyclic frequency larger than twice a frequency of a beat signal,adding means for adding said linear modulation component and said cyclic modulation component and producing a modulation signal, anda high-frequency oscillator producing said high-frequency transmitting signal whose frequency is variable in accordance with said modulation signal;a high-frequency mixer for mixing a received signal of the radar wave reflected from a target object with a local signal derived from said transmitting signal produced from said transmitting signal generating means, and producing the beat signal, the beat signal being a signal having a frequency component representing a difference between said received signal and said local signal; andcalculating means for obtaining a distance from the radar system and a velocity relative to the radar system of said target object based on harmonic components of said beat signal produced when said transmitting signal is modulated by said cyclic modulation component.