Frequency-modulated continuous wave (FMCW) light detection and ranging (LiDAR) is attractive as the next generation of LiDAR. Since FMCW LiDAR is an optical method of measuring a distance using light interference, the distance measurement range is limited according to the coherence length of laser light. For this reason, FMCW LiDAR is forced to use a special laser with a long coherence length. In this study, we propose to increase the measurable distance range through a novel frequency decoding method using a dual interferometer. Experimentally, we can increase the measurable distance over the full range of coherence length.
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