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Sensors 2017, 17(10), 2369; doi:10.3390/s17102369

Influence of Time-Pickoff Circuit Parameters on LiDAR Range Precision

1
School of Instrument Science and Opto-Electronic Engineering, Beihang University, Beijing 100191, China
2
State Key Laboratory of Inertial Science and Technology, School of Instrumentation Science and Opto-electronic Engineering, Beihang University, Beijing 100191, China
*
Author to whom correspondence should be addressed.
Received: 1 September 2017 / Revised: 8 October 2017 / Accepted: 13 October 2017 / Published: 17 October 2017
(This article belongs to the Section Remote Sensors)
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Abstract

A pulsed time-of-flight (TOF) measurement-based Light Detection and Ranging (LiDAR) system is more effective for medium-long range distances. As a key ranging unit, a time-pickoff circuit based on automatic gain control (AGC) and constant fraction discriminator (CFD) is designed to reduce the walk error and the timing jitter for obtaining the accurate time interval. Compared with Cramer–Rao lower bound (CRLB) and the estimation of the timing jitter, four parameters-based Monte Carlo simulations are established to show how the range precision is influenced by the parameters, including pulse amplitude, pulse width, attenuation fraction and delay time of the CFD. Experiments were carried out to verify the relationship between the range precision and three of the parameters, exclusing pulse width. It can be concluded that two parameters of the ranging circuit (attenuation fraction and delay time) were selected according to the ranging performance of the minimum pulse amplitude. The attenuation fraction should be selected in the range from 0.2 to 0.6 to achieve high range precision. The selection criterion of the time-pickoff circuit parameters is helpful for the ranging circuit design of TOF LiDAR system. View Full-Text
Keywords: time-pickoff circuit; automatic gain control; timing discriminators; Monte Carlo simulations; attenuation fraction; delay time time-pickoff circuit; automatic gain control; timing discriminators; Monte Carlo simulations; attenuation fraction; delay time
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, X.; Wang, H.; Yang, B.; Huyan, J.; Xu, L. Influence of Time-Pickoff Circuit Parameters on LiDAR Range Precision. Sensors 2017, 17, 2369.

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