DOI: 10.17586/2226-1494-2018-18-5-758-764


POSSIBILITY OF LOW ALTITUDES MEASUREMENT ABOVE SEA SURFACE UNDER CONDITIONS OF HAZE AND FOG

Nguyen Tung Duc, E. G. Lebedko, Nguyen Van Truong


Read the full article 
Article in Russian

For citation: Nguyen Duc Tung, Lebedko E.G, Nguyen Van Truong. Possibility of low altitudes measurement above sea surface under conditions of haze and fog. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2018, vol. 18, no. 5, pp. 758–764 (in Russian). doi: 10.17586/2226-1494-2018-18-5-758-764

Abstract
Subject of Research. This paper presents analysis of the possibility for establishing all-weather pulse laser altimeters for measuring of low altitudes above the sea surface. We proposed special design features which take into account the random nature of the reflective properties and low reflection coefficient of the water surface. Method. Theoretical analysis and numerical simulation of temporal characteristics of backscattering return and average power reflected from the sea surface were carried out. The method of altitude measuring to the sea surface in conditions of fog and haze is based on the time interval measuring between the emitted pulse drop and the backscattered signal drop when backscattered signal exceeds the certain level.Main Results. A block diagram of pulsed laser altimeter is proposed which makes it possible to measure low altitudes to the sea surface in various meteorological conditions. The ranges of measured altitudes are determined in the clean atmosphere and in the conditions of fog and haze.Practical Relevance. The proposed scheme ensures the navigation of low-flying vehicles above the sea surface under radio interference in all-weather conditions

Keywords: sea surface, impulse characteristics, reflection characteristics, backscattering return, scattering phase function, average intensity, fixing reflected signal, all-weather pulsed laser altimeter

References
1.      Lebed'ko E.G. Pulsed Optical Location Systems. St. Petersburg, Lan' Publ., 2014, 368 p. (in Russian)
2.      Kozlov V.P., Fedorova E.O. Reflection of light from a scattering medium. Opticheskii Zhurnal, 1967, no. 1, pp. 1–7. (in Russian)
3.      Skrelin A.L., Ivanov A.P., Kalinin I.I. Spatial-temporal structure of light haze from a pulsed radiator in the atmosphere. Izv. AN SSSR. Fizika Atmosfery i Okeana, 1970, vol. 6, pp. 889–899. (in Russian)
4.      Volokhatyuk V.A., Kochetkov V.M., Krasovskii P.P. Optical Location Problems. Moscow, Sovetskoe Radio Publ., 1971, 176 p. (in Russian)
5.      Timofeev Yu.M., Vasil'ev A.V. Fundamentals of Theoretical Atmospheric Optics. St. Petersburg, SPbSU Publ., 2007, 152 p. (in Russian)
6.      Lebed'ko E.G., Pokrovskii Yu.P., Porfir'ev L.F., Simovskii R.A., Ivanov V.I. Probabilistic characteristics of impulse signals reflection from an agitated water surface. Journal of Instrument Engineering,1976, vol. 19, no. 6, pp. 109–113.(in Russian)
7.      Bass F.G., Fuks I.M. Wave Scattering from Statistically Rough Surfaces. Oxford, Pergamon Press, 1979, 540 p.
8.      Phillips D.M. Effects of the wavenumber spectrum of sea surface on laser beam reflection. Australian Journal of Physics, 1979, vol. 32, no. 5, pp. 469–489. doi: 10.1071/ph790469
9.      Cox C., Munk W. Measurement of the roughness of the sea surface from photographs of the sun’s glitter. Journal of the Optical Society of America,1954, vol. 44, no. 11, pp. 838–850. doi: 10.1364/josa.44.000838
10.   Hieronymi M. Polarized reflectance and transmittance distribution functions of the ocean surface. Optics Express,2016, vol. 24,no. 14, pp. 1045–1068.doi: 10.1364/oe.24.0a1045
11.   Tsai B.M., Gardner C.S. Remote sensing of sea state using laser altimeter. Applied Optics, 1982, vol. 21,no. 21,pp. 3932–3940.doi: 10.1364/ao.21.003932
12.   Belov M.L., Gorodnichev V.A., Kozintsev V.A., Strelkov B.V. Power of laser signal being received by radar from random part of uneven sea surface. Herald of the Bauman MSTU. Series Instrument Engineering, 2008, no. 3, pp. 3–15. (in Russian)
13.   Bucher E.A., Lerner R.M. Experiments on light pulse communication and propagation through atmospheric clouds. Applied Optics, 1973, vol. 12, no. 10, pp. 2401–2414. doi: 10.1364/ao.12.002401
14.   Ito S., Furutsu K. Theory of light pulse propagation through thick clouds. Journal of the Optical Society of America, 1980, vol. 70, no. 4, pp. 366–374. doi: 10.1364/josa.70.000366
15.   Stotts L.B. Closed form expression for optical pulse broadening in multiple-scattering media. Applied Optics, 1978,vol. 17, no. 4,pp. 504–505.doi: 10.1364/ao.17.000504
16.   Liu C.H., Yeh K.C. Propagation of pulsed beam waves through turbulence, cloud, rain, or fog. Journal of the Optical Society of America, 1977, vol. 67, no. 9, pp. 1261–1266. doi: 10.1364/josa.67.001261
Elliott R.A. Multiple scattering of optical pulses in scale model clouds. Applied Optics, 1983, vol. 22, no. 17, pp. 2670–2681. doi: 10.1364/ao.22.002670


Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Copyright 2001-2019 ©
Scientific and Technical Journal
of Information Technologies, Mechanics and Optics.
All rights reserved.

Яндекс.Метрика