Patent ID: 7002512

Claim:
An FM-CW radar system which frequency-modulates a voltage-controlled oscillator by applying thereto a modulating signal from a modulating signal generator, and which transmits a frequency-modulated wave to a target object and receives a reflected wave from the target object, wherein: said frequency modulating wave output from said modulating signal generator has a variable modulation skew with respect to a time axis, and said system includes means for varying said variable modulation skew and means for discriminating between a received varying signal component and a received non-varying signal component in response to a variation of said variable modulation skew, the means for discriminating determining that: the received varying signal component, which varies in response to said variable modulation skew of at least one of upward and downward slopes of the modulating signal in the form of a triangular wave, is a beat frequency component of a signal related to the target object, and the received non-varying signal component, which does not vary in response to said variable modulation skew, is a frequency component of a noise signal which is not related to the target object.