Radar system installable in an automotive vehicle for detecting a target object

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 including
• first 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, and
• a 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;
• and
• calculating 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.