Light Detection And Ranging (LiDAR) has been well known as it offers high ranging accuracy, and shows promising prospects in autonomous vehicles and various field. Traditional frequency modulated continuous wave (FMCW) LiDAR ranging is based on heterodyne detection, calculating unknown distance by extracting the frequency of the interference signal. However, such technique suffers from frequency modulation (FM) nonlinearity, which leads to inaccurate ranging results.
source https://phys.org/news/2021-03-lidar-ranging-micron-accuracy.html
