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Proceedings Paper

Accuracy study of time delay estimation techniques in laser pulse ranger
Author(s): Jinliang Yang; Xingshu Wang; Yang Gao
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Paper Abstract

Time-of-flight measurement by using laser pulses is an alternative method in laser range finding and laser scanning, the echo pulses originating from backscattering of the emitted laser pulse on targets is detected by optical receiver. The distance of target can be obtained by measuring the round-trip time. Time-of-arrival estimation may be based on schemes such as constant-fraction discriminator (CFD) in analog electronics. In contrast, as sampled signals are available, time delay estimation may be based on schemes like direct cross-correlation function (CCF) and average square difference function (ASDF) in digital electronics. By the way, constant-fraction discriminator can also be used in digital electronics. All this three methods are analyzed and compared with each other. It is shown that estimators based on CCF and ASDF are more precise than conventional CFD based estimator.

Paper Details

Date Published: 19 December 2013
PDF: 6 pages
Proc. SPIE 9046, 2013 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 90461D (19 December 2013); doi: 10.1117/12.2038131
Show Author Affiliations
Jinliang Yang, National Univ. of Defense Technology (China)
Xingshu Wang, National Univ. of Defense Technology (China)
Yang Gao, National Univ. of Defense Technology (China)


Published in SPIE Proceedings Vol. 9046:
2013 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems
Hwa-Yaw Tam; Kexin Xu; Hai Xiao; Jigui Zhu, Editor(s)

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