Lidar Signal Depolarization by Solid Targets and its application to Terrain Mapping and 3D Imagery

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Authors
  1. Cao, X.
  2. Bernier, R.
Corporate Authors
Defence R&D Canada - Valcartier, Valcartier QUE (CAN);LES INSTRUMENTS OPTIQUES DU ST-LAURENT INC, MIRABEL QUE (CAN)
Abstract
Solid targets are used for calibration of lidars for atmospheric studies. Solid targets make up the surface of the Earth and thus they reflect light back to lidars being used for Terrain Mapping. Experience and theory show that if polarization effects are not accounted for in the lidar calibration process, important systematic errors will result. In this report, the experimental study of various solid targets used in lidar calibration shows that none of these truly meets the expectation of being a true lambertian reflector, that is a perfectly isotropically reflector and a totally depolarizing one as well. On another hand, Terrain Mapping, an important lidar application, is still under development. Lidars used in Terrain Mapping yield massive volumes of data. The automatic processing of these data still is an issue and experience shows that adding more features to the lidar signal, over and above the range information, would be a most valuable contribution to automated processing. The work reported in this report is about the use of the polarization signature of solid targets in Terrain Mapping. First, experimental results are compared to the theoretical predictions of the pBRDF theory. The analysis of the results shows that the polarization signature from solid targets may be expected to be a reliable and repeatable feature to add to the data processing. Then, it is shown that discrimination between targets may be obtained by use of their polarization signature. This opens u

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Report Number
DRDC-VALCARTIER-CR-2011-236 — Contractor Report
Date of publication
01 Mar 2011
Number of Pages
74
DSTKIM No
CA037898
CANDIS No
537764
Format(s):
Electronic Document(PDF)

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