Distance and speed measuring apparatus

A distance and velocity measurement apparatus for measuring a distance to a target and a velocity of the target by a laser light, the apparatus comprising:

• a first laser apparatus configured to irradiate a first laser light having a first wavelength and a first chirp rate;
• a second laser apparatus configured to irradiate a second laser light having a second wavelength of a wavelength that differs from the first wavelength and a second chirp rate of a chirp rate that differs from the first chirp rate;
• an irradiation-side multiplexer configured to subject the first laser light and the second laser light to multiplexing;
• a optical splitter configured to spectrally separate a laser light having been subjected to multiplexing by the irradiation-side multiplexer to an irradiation light to be irradiated to the target and a reference light serving as a reference for measurement;
• an irradiated light receiving device configured to irradiate the irradiation light to the target and receive a reflected light from the target;
• a light receiving-side multiplexer configured to subject the reflected light transmitted from the irradiated light receiving device and the reference light to multiplexing;
• a photodetector configured to convert a synthesized light having been subjected to multiplexing by the light receiving-side multiplexer to an electric signal;
• and
• a wave detector configured to perform detection of the conversion signal having been converted by the photodetector,
• wherein the wave detector is configured to detect the conversion signal to acquire a beat signal, and to analyze the distance to the target and the velocity of the target by subjecting the beat signal to frequency analysis, and
• wherein a difference between the first chirp rate and the second chirp rate (AZ) satisfies a following relationship:
• Δζ×2Rmax/C<10 MHz (wherein C is a velocity of light in vacuum),
• wherein Rmax represents a maximum distance for performing measurement.