ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


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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  1. Bolshakov A.N., Burdyugov V.M., Grodskiy S.A., Kudryavtsev V.N., Opredelenie spektra energonesuschih poverhnostnyih voln po izobrazheniyu solnechnogo blika (Determination of energy spectrum of surface waves on the image of the solar flare), Issledovanie Zemli iz kosmosa, 1988, No. 5, pp. 11–18.
  2. Kuznetsov C., Sapryikina Ya., Eksperimentalnyie issledovaniya vozniknoveniya voln-ubiyts pri evolyutsii uzkogo spektra krutyih voln (Experimental study of the occurrence of freak waves during the evolution of a narrow spectrum of steep waves), Fundamentalnaya i prikladnaya gidrofizika, 2012, Vol. 5, No. 1, pp. 52–63.
  3. Pustovoytenko V.V., Zapevalov A.S., Operativnaya okeanografiya: sovremennoe sos-toyanie, perspektivyi i problemyi sputnikovoi al'timetrii (Operational Oceanography: Current status, prospects and problems), Sevastopol: “EKOSI-Gidrofizika”, 2012, 218 p.
  4. Bréon F.M, Henriot N., Spaceborne observations of ocean glint reflectance and modeling of wave slope distributions, J. Geoph. Res., 2006, Vol. 111, No. C6, C06005.
  5. Brown G.S., The average impulse response of a rough surface and its applications, IEEE Trans. Antennas Propagat., 1977, Vol. AP-25, Issue 1, pp. 67–74.
  6. Chand D., Anderson T.L., Wood R., Charlson R.J., Hu Y., Liu Z., Vaughan M., Quantifying above-cloud aerosol using spaceborne lidar for improved understanding of cloudy-sky direct climate forcing, J. of Geophysical Research, 2008, Vol. 113, D13206.
  7. Cox C., Munk W., Measurement of the roughness of the sea surface from photographs of the Sun’s glitter, J. Opt. Soc. Am., 1954, Vol. 14, pp. 838–850.
  8. Ginneken B., Stavridi M., Koenderink J., Diffuse and Specular Reflectance from Rough Surface, Appl. Optics, 1998, Vol. 37, pp. 130–139.
  9. Gómez-Enri J., Gommenginger C.P., Srokosz M.A., Challenor P.G., Measuring global ocean wave skewness by retracking RA-2 Envisat waveforms, J. of Atmospheric and Oceanic Technology, 2007, Vol. 24, pp. 1102–1116.
  10. Hayne G.S., Radar altimeter mean return waveforms from near-normal-incidence ocean surface scattering, IEEE Transactions on Antennas and Propagation, 1980, Vol. AP-28, pp. 687–692.
  11. Hu Y., Stamnes K., Vaughan M., Pelon J., Weimer C., Wu D., Cisewski M., Sun W., Yang P., Lin B., Omar A., Flittner D., Hostetler C., Trepte C., Winker D., Gibson G., Santa-Maria M., Sea surface wind speed estimation from space-based lidar measurements, Atmos. Chem. Phys., 2008, Vol. 8, pp. 3593–3601.
  12. Pokazeev K.V., Zapevalov A.S., Pustovoytenko V.V., The simulation of a radar altimeter return waveform, Moscow University Physics Bulletin, 2013, Vol. 68, No. 5, pp. 420–425.
  13. Zapevalov A.S., Bol’shakov A.N., Smolov V.E., Simulating of the probability density of sea surface elevations using the Gram–Charlier series, Oceanology, 2011, Vol. 51, No. 3, pp. 406–413.
  14. Zapevalov A.S., Lebedev N.E., Simulation of statistical characteristics of sea surface during remote optical sensing, Atmospheric and Oceanic Optics, 2014, Vol. 27, Issue 6, pp. 487–492.
  15. Zapevalov A.S., Effect of skewness and kurtosis of sea-surface elevations on the accuracy of altimetry surface level measurements, Izvestiya, Atmospheric and Oceanic Physics, 2012, Vol. 48, No. 2, pp. 200–206.