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Proceedings Paper

Influence of wind roughness on the time characteristics of impulse airborne ocean lidars
Author(s): Alexander G. Luchinin
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Paper Abstract

A method is developed for estimating the influence of surface waves and multiple scattering in water on delay and broadening of light pulse signal propagating along the path: atmosphere - rough surface - sea water. The parameters of signal entering an underwater receiver with isotropic directional diagram are calculated. It is shown that surface waves strongly influence the temporal characteristics of signal at small depths of receiver location and in clear water. The influence of geometrical factors, including the size of receiving aperture and the angular characteristics of emitter, is studied. In the calculations, it is assumed that surface waves are isotropic, the elevation spectrum is determined by the Pierson-Moskowitz formula, and the surface slope variance corresponds to the Cox and Munk data. As the Green function of the radiative transfer equation we used the solution of this equation in the refined self-similar approximation taking into account diffusion of photons along multipaths. This method is generalized in the same approximations to evaluate the temporal characteristics of lidar signals reflected from the bottom or water. Delay and broadening of pulse echo signal for two types of lidars, i.e., with isotropic and extremely narrow receiving diagrams, are calculated. The contribution of waves to delay and broadening of echo signal in lidars is, as a rule, several times smaller than the contribution of multiple scattering effects in water; nevertheless it should be taken into account for correct estimation of the limiting depth resolution of lidar. It is shown that lidar with a narrow directional diagram has a better depth resolution than lidar with a wide diagram. However for some sets of parameters in these lidars, the wave contribution to signal delay can significantly exceed the contribution of water. The fulfilled estimates are greatly important for bathymetric lidars.

Paper Details

Date Published: 18 October 2010
PDF: 9 pages
Proc. SPIE 7825, Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2010, 78250R (18 October 2010); doi: 10.1117/12.866333
Show Author Affiliations
Alexander G. Luchinin, Institute of Applied Physics (Russian Federation)

Published in SPIE Proceedings Vol. 7825:
Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2010
Charles R. Bostater Jr.; Stelios P. Mertikas; Xavier Neyt; Miguel Velez-Reyes, Editor(s)

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