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Proceedings Paper

Scene-based algorithm for range/intensity estimation correction for the flash 3D ladar system
Author(s): Steven Jordan; Ernest Armstrong; Håkan Larsson; Matthew Gebhardt; Ove Steinvall
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Paper Abstract

In many laser radar systems the intensity value's strength is dependent on the reflectivity of the measured surface. High intensity values are necessary for accurate range measurements. When measuring a low-reflectivity surface the returning laser intensity will be low. This, in turn, results in high uncertainty in the range estimate. In this paper, an approach to correct the intensity values are presented which results in more accurate range estimates even on lowreflecting surfaces. Examples are shown using the ASC (Advanced Scientific Concepts) FLASH 3D LADAR sensor. During a data collection several series of measurements characterizing the shape of the return laser pulse from surfaces with known reflectivity were performed. Using principal components analysis (PCA), variation in pulse shape as a function of laser intensity was determined. These data were then used to identify a parametric model that described the variation in intensity values relative to the surface's reflectivity. Based on the model, an approach to systematically adjust intensity values has been developed. In this paper we will also examine laser timing jitter, intensity, and their effects on range estimation.

Paper Details

Date Published: 29 April 2010
PDF: 10 pages
Proc. SPIE 7684, Laser Radar Technology and Applications XV, 76840Q (29 April 2010); doi: 10.1117/12.849734
Show Author Affiliations
Steven Jordan, Air Force Research Lab. (United States)
Ernest Armstrong, OptiMetrics, Inc. (United States)
Håkan Larsson, Swedish Defence Research Agency (Sweden)
Matthew Gebhardt, Air Force Research Lab. (United States)
Ove Steinvall, Swedish Defence Research Agency (Sweden)

Published in SPIE Proceedings Vol. 7684:
Laser Radar Technology and Applications XV
Monte D. Turner; Gary W. Kamerman, Editor(s)

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