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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 1, pp. 80-87

Impact of the sounding pulse duration of a spaceborne lidar on the shape of the pulse reflected by the sea surface

A.S. Zapevalov 1 , N.E. Lebedev 1 
1 Marine Hydrophysical Institute RAS, Sevastopol, Russia
Accepted: 12.01.2017
DOI: 10.21046/2070-7401-2017-14-1-80-87
The possibilities and limitations for determining sea surface slopes dispersion are analyzed by means of spaceborne pulsed laser sounding. At present, calculations of sea surface characteristics from satellite laser sounding data are made on the basis of models built for analysis of spaceborne optical scanners signals. The influence of sounding pulse duration on the accuracy of the slopes dispersion determining is considered in the framework of a linear model of the surface waves field, in which the height of the specular reflection points on the sea surface has Gaussian distribution. The dependence of the detected lidar signal amplitude on duration of the sounding pulse is shown. This effect is due to the facts that in the case of short pulse, some portion of specular reflection points located at different heights may be disposed outside the area lightened by this pulse, and that these points being located at different heights reflect the sounding signal at different time intervals. It is shown that to measure the sea surface slopes dispersion with an error ≤ 5%, the sounding pulse duration must be twice the time of its passage through the distance equal to the significant height of the sea waves.
Keywords: remote sensing, lidar, sea surface, slopes
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