Open AccessFrequency‐modulated continuous‐wave light detection and ranging with sinusoidal frequency modulation and beat phase detection
Author(s) -
Tsuchida H.
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2019.3005
Subject(s) - ranging , frequency modulation , beat (acoustics) , chirp , continuous wave , chirp spread spectrum , phase modulation , optics , modulation (music) , acoustics , pulse frequency modulation , amplitude modulation , frequency deviation , physics , instantaneous phase , laser , radio frequency , computer science , telecommunications , phase noise , automatic frequency control , radar , spread spectrum , channel (broadcasting) , direct sequence spread spectrum
The performance of a frequency‐modulated continuous‐wave light detection and ranging is severely limited by the inherent non‐linear chirp when laser diodes with direct frequency modulation are used as light sources. The author proposes and demonstrates a new modulation and detection scheme that is immune to non‐linear chirp. Sinusoidal frequency modulation and beat phase detection are employed for measuring both the velocity and distance of a target. Relative accuracies below ± 2 mm/s and ± 1 mm are confirmed for velocity and distance measurements, respectively, in the proof‐of‐principle experiment.