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Open AccessArticle

Calibration of the Pulse Signal Decay Effect of Full-Waveform Hyperspectral LiDAR

by Changsai Zhang 1,2, Shuai Gao 1,2,*, Zheng Niu 1,*, Jie Pei 1,2, Kaiyi Bi 1,2 and Gang Sun 1
1
The State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
*
Authors to whom correspondence should be addressed.
Sensors 2019, 19(23), 5263; https://doi.org/10.3390/s19235263
Received: 17 October 2019 / Revised: 16 November 2019 / Accepted: 28 November 2019 / Published: 29 November 2019
(This article belongs to the Section Remote Sensors, Control, and Telemetry)
Full-waveform hyperspectral LiDAR (FWHSL) is able to obtain spectral and spatial information by utilizing a single instrument, and it has become more and more commonly used in vertical distribution studies of structural and biochemical characteristics of vegetation. However, the pulse-echo arrival times of multiple spectral channels of the FWHSL are not consistent and this causes range ambiguity in spectral channels. In this paper, the pulse signal decay effect on range measurements was studied by measuring the varying trends of pulse signal decay between spectral channels with different material properties. The experiments were repeated at different distances. All of the spectral channels were compared for different materials. The results suggest that the channels in the red edge spectral region of vegetation have good stability and accuracy for range measurements of varied distance and materials properties. Finally, based on the geometric invariability in a specific red edge channel, a practical calibration approach for the pulse signal decay effect is also presented. The validation tests showed it could improve the pulse signal decay effect of full-waveform hyperspectral LiDAR. View Full-Text
Keywords: hyperspectral LiDAR; range ambiguity; point clouds; pulse decay correction; vegetation hyperspectral LiDAR; range ambiguity; point clouds; pulse decay correction; vegetation
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Zhang, C.; Gao, S.; Niu, Z.; Pei, J.; Bi, K.; Sun, G. Calibration of the Pulse Signal Decay Effect of Full-Waveform Hyperspectral LiDAR. Sensors 2019, 19, 5263.

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