Dr. Alexander A. Molkov Profile

Dr. Alexander A. Molkov

at Institute of Applied Physics of the RAS

SPIE Involvement:

Author

Publications (23)

Proceedings Article | 12 September 2021 Poster + Paper

Investigation of the possibility of ecological monitoring of inland water reservoirs using an automatic radar system

Alexey Ermoshkin, Ivan Kapustin, Nikolay Bogatov, Alexander Molkov, Evgeniy Poplavskiy, Nikita Rusakov, Alexander Yunisov

Proceedings Volume 11857, 118570P (2021) https://doi.org/10.1117/12.2599874

KEYWORDS: Radar, Pollution, Neurons, Pollution detection, Environmental monitoring, Contamination, Water, Algorithm development, Detection and tracking algorithms

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Proceedings Article | 12 September 2021 Poster + Paper

The multisensory approach to hydrophysical measurements of the ocean surface layer

Alexey Ermoshkin, Mikhail Salin, Ivan Kapustin, Alexander Molkov, Nikolay Bogatov

Proceedings Volume 11857, 118570S (2021) https://doi.org/10.1117/12.2600136

KEYWORDS: Radar, Scattering, Acoustics, Doppler effect, Ocean optics, Remote sensing

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Proceedings Article | 20 September 2020 Poster + Paper

Observations of radar/optical slick signatures of marine processes in the coastal zone

Ivan Kapustin, Olga Danilicheva, Olga Shomina, Alexander Molkov, Alexander Kupaev, Alexey Ermoshkin, Irina Sergievskaya, Stanislav Ermakov

Proceedings Volume 11529, 115290T (2020) https://doi.org/10.1117/12.2574236

KEYWORDS: Ocean optics, Radar, Oceanography, Image processing, Remote sensing, Sensors, Atmospheric physics, Atmospheric sensing, Applied physics, Satellite imaging

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Analysis of possibilities of identification and characterization of marine processes using their signatures in radar and optical imagery of the sea surface is a very important problem of the ocean remote sensing which has not been solved yet completely by now. Marine slicks which are the areas of suppressed wind waves can be recorded by different sensors and can be indicators of internal waves, non uniform currents, atmospheric convective cells, etc. Field studies including those simultaneous and co-located with remote observations is the most perspective way to the problem solution. An expedition of the Institute of Applied Physics RAS was organized to study the nature of slick bands and its dynamics in the field of various subsurface processes. Field experiments were carried out in the coastal zone of the Black sea from the Oceanographic Platform of Marine Hydrophysical Institute RAS and from the shore. The structure of the currents in the studied area is characterized by significant heterogeneity, so we were able to register different slick structures in the flow field and wind and the slick dynamics. In some experiments, marine slicks were recorded simultaneously in satellite Sentinel images. Observations of surface manifestations of internal waves were carried out using a digital radar station MRS-1000 and multi-frequency radar complex of IAP RAS. At the same time the measurements of currents in the water column were carried out using the ADCP WH Monitor 1200 kHz, wind speed and direction at a height of 30 meters using WindSonic acoustic anemometer. During the passage of internal waves a system of slick bands with a reduced intensity of small-scale waves were observed. Slick bands were observed mainly over the rear slopes of the internal waves; the data from the accompanying measurements showed that the phase velocity was close to the surface current velocity. Theoretical analysis has shown that in this case the convergent zones, where surfactants are accumulated were formed at the rear slopes of the internal waves. This mechanism of slick formation was predicted earlier theoretically and then was modeled in laboratory experiment.

Proceedings Article | 20 September 2020 Presentation + Paper

Retrieval of slope spectrum of sea roughness by Snell’s window imagery: theory and numerical experiment (one-dimensional sea roughness)

Aleksandr Molkov

Proceedings Volume 11529, 115290C (2020) https://doi.org/10.1117/12.2573949

KEYWORDS: Statistical analysis, Environmental sensing, Reconstruction algorithms, Image processing, Statistical modeling, Inverse problems

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Proceedings Article | 20 September 2020 Poster + Paper

Retrieval of omnidirectional slope spectrum of sea roughness by underwater solar path images: theory and numerical experiment (one-dimensional sea roughness)

Aleksandr Molkov

Proceedings Volume 11529, 115290M (2020) https://doi.org/10.1117/12.2573775

KEYWORDS: Ocean optics, Statistical analysis, Inverse optics, Mathematical modeling, Sun, Correlation function, Light scattering, Inverse problems, Image analysis, Image retrieval

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Proceedings Article | 20 September 2020 Poster + Paper

Theoretical and experimental studies of sea surface current and wind waves spectra estimation using microwave Doppler marine radars

Alexey Ermoshkin, Ivan Kapustin, Alexander Molkov, Nickolay Bogatov

Proceedings Volume 11529, 115290U (2020) https://doi.org/10.1117/12.2574264

KEYWORDS: Doppler effect, Radar, Microwave radiation, Oceanography, Water, Error analysis, X band, Ka band, Wind measurement, Panoramic photography

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Proceedings Article | 14 October 2019 Paper

The retrieval of wind wave characteristics by the underwater solar path image: slope frequency spectrum

Alexander Molkov, Lev Dolin, Ivan Kapustin, Olga Shomina

Proceedings Volume 11150, 111501F (2019) https://doi.org/10.1117/12.2533010

KEYWORDS: Image retrieval, Sun, Wind measurement, Water, Signal attenuation, Image processing, Capillaries, Reflection, Receivers, Remote sensing

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Proceedings Article | 14 October 2019 Paper

An effect of sound generation due to surfactant films on the water surface illuminated by intensive IR radiation

Alexander Molkov, Ivan Kapustin, Stanislav Ermakov, Tatyana Lazareva, George Leshchev, Irina Sergievskaya

Proceedings Volume 11150, 111501K (2019) https://doi.org/10.1117/12.2533156

KEYWORDS: Infrared radiation, Water, Infrared lasers, Remote sensing, Radiation effects, Pollution, Ocean optics, Luminescence, LIDAR, Natural surfaces

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Proceedings Article | 14 October 2019 Paper

Statistical characteristics of Doppler velocity shift in artificial slick on sea surface

Alexey Ermoshkin, Alexander Molkov, Ivan Kapustin

Proceedings Volume 11150, 111501L (2019) https://doi.org/10.1117/12.2533167

KEYWORDS: Radar, Doppler effect, Modulation, Spatial resolution, X band, Polarization, Phase shift keying, Fourier transforms, Antennas, Shape analysis

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Proceedings Article | 14 October 2019 Presentation + Paper

Drift and shape of oil slicks on the water surface

Stanislav Ermakov, Olga Danilicheva, Ivan Kapustin, Aleksandr Molkov

Proceedings Volume 11150, 111500J (2019) https://doi.org/10.1117/12.2533203

KEYWORDS: Remote sensing, Pollution, Radar, Ocean optics, Process control, Environmental sensing, Vegetable oil, Photography, Unmanned aerial vehicles, Global Positioning System

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Proceedings Article | 14 October 2019 Paper

Fluorescence of organic films various origin and thickness to develop a method of their remote sensing on the sea surface: laboratory studies

Alexander Molkov, George Leshchev, Tatyana Lazareva, Ivan Kapustin

Proceedings Volume 11150, 111501O (2019) https://doi.org/10.1117/12.2533256

KEYWORDS: Luminescence, Remote sensing, Ultraviolet radiation, Light sources, Spectroscopy, Signal attenuation, Natural surfaces, Fluorescence spectroscopy, LIDAR, Ocean optics

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Proceedings Article | 14 October 2019 Paper

On the features of Doppler velocities estimation with coherent radar of high spatial resolution

Alexey Ermoshkin, Ivan Kapustin, Alexander Molkov, Nikolay Bogatov, Viktor Bakhanov

Proceedings Volume 11150, 111501I (2019) https://doi.org/10.1117/12.2533072

KEYWORDS: Radar, Doppler effect, Spatial resolution, Modulation, X band, Polarization, Fourier transforms, Antennas, Wave propagation, Phase velocity

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Proceedings Article | 14 October 2019 Paper

Satellite and in-situ observations of a river confluence zone

Stanislav Ermakov, Alexander Molkov, Ivan Kapustin, Tatiana Lazareva, Olga Danilicheva, Olga Shomina, Maria Smirnova, Olga Lavrova

Proceedings Volume 11150, 111501S (2019) https://doi.org/10.1117/12.2533470

KEYWORDS: Satellites, Earth observing sensors, Radar, Satellite imaging, In situ remote sensing, Natural surfaces, Chemical analysis, Foam, Pollution, Eye

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Proceedings Article | 14 October 2019 Presentation + Paper

Ultraviolet fluorescence lidar (UFL) as a high-resolution measurement tool for water quality parameters used as ground-truth data for Sentinel-2 regional models

Vadim Pelevin, Aleksandr Molkov, Sergei Fedorov, Elena Korchemkina

Proceedings Volume 11150, 111500P (2019) https://doi.org/10.1117/12.2533323

KEYWORDS: LIDAR, Satellites, Data modeling, Algorithm development, Water, In situ metrology, Luminescence, Multispectral imaging, Calibration, Spectroscopy, Laser induced fluorescence

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Proceedings Article | 13 December 2018 Paper

Reflectance model for satellite monitoring of bio-optical characteristics of Gorky reservoir waters

A. Molkov , E. Korchemkina, D. Kalinskaya, I. Kapustin

Proceedings Volume 10833, 1083360 (2018) https://doi.org/10.1117/12.2504595

KEYWORDS: Reflectivity, Absorption, Water, Data modeling, Inverse optics, Ocean optics, Backscatter, Statistical analysis, Algorithm development

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Proceedings Article | 11 October 2018 Paper

Underwater sky image as a tool for estimating some inherent optical properties of eutrophic water

Alexandr Molkov, Lev Dolin, George Leshev

Proceedings Volume 10784, 1078418 (2018) https://doi.org/10.1117/12.2325828

KEYWORDS: Absorption, Water, Optical properties, Optical filters, Scattering, Light scattering, Video, Image restoration, Tin, Data modeling

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Proceedings Article | 11 October 2018 Paper

Lidar measurements spatial variability of optical properties of water in eutrophic reservoirs

Aleksandr Molkov, Lev Dolin, Vadim Pelevin, Ivan Kapustin, Nikolay Belyaev, Boris Konovalov, Viacheslav Kremenetskiy

Proceedings Volume 10784, 107841A (2018) https://doi.org/10.1117/12.2500483

KEYWORDS: LIDAR, Backscatter, Optical properties, Water, Carbon, Active optics, Geometrical optics, Absorption, Luminescence, Scattering

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Proceedings Article | 11 October 2018 Paper

Seasonal variability of remote sensing reflectance of the Gorky reservoir

Aleksander Molkov, Elena Korchemkina, Ivan Kapustin, George Leshev, Olga Danilichevaa

Proceedings Volume 10784, 1078417 (2018) https://doi.org/10.1117/12.2325753

KEYWORDS: Remote sensing, Reflectivity, Spectroscopy, Satellites, Carbon, Minerals, Ocean optics, Water, Active optics, Optical properties

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Proceedings Article | 10 October 2018 Presentation + Paper

Remote sensing of evolution of oil spills on the water surface

S. Ermakov, I. Kapustin, A. Molkov, G. Leshev, O. Danilicheva, I. Sergievskaya

Proceedings Volume 10784, 107840L (2018) https://doi.org/10.1117/12.2325745

KEYWORDS: Remote sensing, Lithium, Water, Ocean optics, Global Positioning System, Photography, Unmanned aerial vehicles, Quantitative analysis, Astatine, Process modeling

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Proceedings Article | 3 October 2017 Paper

Experimental study of dual polarized radar return from the sea surface

S. Ermakov, I. Kapustin, O. Yu. Lavrova, A. Molkov, I. Sergievskaya, O. Shomina

Proceedings Volume 10422, 104220G (2017) https://doi.org/10.1117/12.2278555

KEYWORDS: Radar, Doppler effect, Polarization, Backscatter, X band, Scattering, S band, Microwave radiation, Wave propagation, Solids

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Proceedings Article | 19 October 2016 Presentation + Paper

Radar probing of surfactant films on the water surface using dual co-polarized SAR

S. Ermakov, J. C. da Silva, I. Kapustin, A. Molkov, I. Sergievskaya, O. Shomina

Proceedings Volume 9999, 99990A (2016) https://doi.org/10.1117/12.2241444

KEYWORDS: Radar, Synthetic aperture radar, Backscatter, Microwave radiation, Remote sensing, Satellites, Polarization, Ocean optics, Water, Reflectivity

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Proceedings Article | 19 October 2016 Paper

Underwater sky image as remote sensing instrument of sea roughness parameters and its variability

Alexander Molkov, Lev Dolin, Ivan Kapustin, Irina Sergievskaya, Olga Shomina

Proceedings Volume 9999, 99991D (2016) https://doi.org/10.1117/12.2241816

KEYWORDS: Water, Ocean optics, Remote sensing, Receivers, Wind energy, Refraction, Tin, Signal processing, Image analysis, Sun

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Proceedings Article | 19 October 2016 Presentation + Paper

Doppler shifts of radar return from the sea surface

S. Ermakov, I. Kapustin, A. Molkov, I. Sergievskaya, O. Shomina

Proceedings Volume 9999, 999905 (2016) https://doi.org/10.1117/12.2241876

KEYWORDS: Radar, Doppler effect, Modulation transfer functions, Backscatter, Polarization, Modulation, Microwave radiation, Scattering, X band, Solids

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Showing 5 of 23 publications

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