Frequency-Modulated Continuous-Wave Coherent Lidar With Downlink Communications Capability

Xu, Zhongyang; Chen, Kai; Sun, Xiuyuan; Zhang, Kelin; Wang, Yicheng; Pan, Shilong

doi:10.1109/lpt.2020.2990942

Cited by 5 publications

(1 citation statement)

References 22 publications

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“…Therefore, FMCW Lidars have been widely applied in various fields such as atmospheric measurements, object tracking and location, 3D imaging, automotive collision avoidance, free-space optical downlink communications, bio-medical application, etc. [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Ranging Resolution of a FMCW Lidar

Xiao

Jiang

et al. 2021

Photonics

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In some previous reports about frequency-modulated continuous-wave (FMCW) Lidar, observing the longer waveform of a de-chirped signal is considered an effective scheme for further improving the ranging resolution. In this work, the ranging resolution of a FMCW Lidar is experimentally investigated, and the feasibility of such a scheme is tested. During the experiment, a FMCW signal is generated via a Mach–Zehnder modulator in the transmitted port. In the received port, the de-chirped signal is extracted based on a homodyne detection scheme and is analyzed by an electrical spectrum analyzer. Two different methods are adopted to determine the ranging resolution. One is based on a single target, for which the ranging resolution is obtained through inspecting the shift of spectral peak position as the target moves. The other is based on two targets, for which the ranging resolution is acquired through inspecting the variation of spectrum distribution as the spacing of two targets changes. The experimental results demonstrate that extending the observed duration of the de-chirped signal cannot improve the ranging resolution, and the corresponding physical mechanism is revealed.

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