Patent ID: 6097331
Filing Date: 2000-08-01
Classification: G01S

Abstract:
A radar apparatus comprising:a high-frequency generating circuit generating a high-frequency signal which is so modulated in frequency as to vary with time in a linear fashion and splitting the high-frequency signal into an output signal to be transmitted as a radar wave and a local signal;a high-frequency mixer mixing an input signal that is a return of the radar wave from a target object with the local signal produced by said high-frequency generating circuit to produce a beat signal consisting of a frequency component corresponding to a difference in frequency between the output signal and the input signal;a modulating signal producing circuit producing a modulating signal which is two or more times greater in frequency than a fundamental component of the beat signal as a function of a distance to and a relative speed of the target object; andan amplitude modulating circuit modulating an amplitude of at least one of the output signal, the input signal, and the local signal in accordance with the modulating signal so that a modulation index falls within a range of zero (0) to one (1).