LIDAR FOR MEASURING DISTANCE USING SELF-HETERODYNE DETECTION

A LiDAR device is disclosed that measures a distance based on self-heterodyne detection using coherence. According to an embodiment, the LiDAR device includes a light generator that generates a coherent transmission light source having a first frequency at a specific interval and delivers a time when frequency modulation into the first frequency is performed to a distance measurement circuit, an optical transmitter that delivers the transmission light source, delivered from the light generator, to an optical heterodyne detector and radiates the transmission light source to an object of the free space, an optical receiver that receives a reception light source where the transmission light source is reflected from the object, the optical heterodyne detector that outputs an electrical signal of a beat frequency based on the transmission light source delivered from the light generator and the reception light source delivered from the optical receiver, and the distance measurement circuit that measures a distance to the object based on the electrical signal of the beat frequency delivered from the optical heterodyne detector and the frequency modulation time delivered from the light generator.