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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bobrov P. P., Kroshka E. S., Muzalevskiy K. V.
Заглавие : The effect of dielectric relaxation processes on the complex dielectric permittivity of soils at frequencies from 10 kHz to 8 GHz—Part II: Broadband analysis
Колич.характеристики :11 с
Место публикации : IEEE Trans. Geosci. Remote Sens. - 2024. - Vol. 62. - Ст.2000411. - ISSN 01962892 (ISSN), DOI 10.1109/TGRS.2023.3340693. - ISSN 15580644 (eISSN)
Примечания : Cited References: 51
Аннотация: This article is the second in a series evaluating the effect of dielectric relaxation processes on the relatively effective complex dielectric permittivity (RCP) of soils. Part II is based on the results of experimental measurements in the frequency range 10 kHz to 8–20 GHz. The broadband dielectric spectrum model includes the high-frequency part as a model of the dielectric mixture and the relaxation part as the sum of three relaxation processes modeled by the Debye and Cole–Cole formulas. For modeling the high-frequency part of the spectrum, the Dobson and Mironov models were considered as possible options. As stated in Part I, the influence of relaxation processes on the imaginary part of the RCP extends up to frequencies of units of gigahertz. The increase in the imaginary part in these models was compensated by unrealistically high values of the specific electrical conductivity of free and bound water. We examined the correspondence of these models to experimental data at frequencies above 2–5 GHz, assuming that the conductivity of bound and free water is zero. The parameters of relaxation processes were found while solving the least-square optimization problem using the technique for determining the continuous distribution of relaxation times (DRTs). Found process parameters depend on the content of clay, organic carbon, and moisture of the samples. The more clay is in the soil, the greater the strength of these processes is. The influence of organic carbon with the conditions being equal consists in the reduction of the real and imaginary parts of RCP.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Yashchenko A. S., Bobrov P. P., Mironov V. L.
Заглавие : The use of navigation satellites signals for measurement the absorbance of the forest canopy
Коллективы : Progress in Electromagnetics Research Symposium - Spring 2017 , Russian Foundation for Basic Research [16-35-50182 mol_nr]
Место публикации : Progress in Electromagnetics Research Symposium - Spring: IEEE, 2017. - P.1227-1231. - ISBN 978-1-5090-6269-0, DOI 10.1109/PIERS.2017.8261936
Примечания : Cited References:5. - This research was supported by the Russian Foundation for Basic Research, project 16-35-50182 mol_nr.
Аннотация: The results of measurement of the electromagnetic wave attenuation by the forest canopy at L-band are presented. The soil moisture mapping with reasonable accuracy in a global scale is only possible using the data of satellite radiometers at L-band frequency (SMOS and SMAP remote sensing programs). In the process of soil moisture retrieval from remote sensing data it is necessary to know the state of ecosystems on the Earth's surface. Forests are one of the dominant terrestrial ecosystems of Earth covering a large area of the surface. The attenuation coefficient of the forest canopy has high value even at L-band frequency. In the absence of forest canopy attenuation data the error of retrieval of the soil moisture for woodlands areas will have very high values. For this reason the emissivity model of Earth surface needs a priory data of the emissive and attenuate properties of the forest cover. One of methods of measurement of forest canopy attenuation coefficient at L-band frequency is using the signals of Global Navigation Satellite System (GNSS). Measurement showed that for elevation angle of 50 and 35 degrees the attenuation has a value range of -6 -10 dB and -10 -15 dB respectively. This makes it possible to claim that under certain conditions the soil radiothermal emission can make a noticeable contribution to the overall emission of surface covered forest. The results obtained in the measurement can be used in SMOS and SMAP sub-pixel data processing.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bobrov P. P., Mironov V. L., Repin A. V.
Заглавие : Dielectric permittivity spectra of oil-water-saturated sandy-clayey rocks of different mineralogical compositions and relaxation properties of water in these rocks
Коллективы : RFBR [12-05-00502a, 14-05-00151a]
Место публикации : Russ. Geol. Geophys.: Elsevier Science, 2015. - Vol. 56, Is. 7. - P.1065-1073. - ISSN 1068-7971, DOI 10.1016/j.rgg.2015.06.007
Примечания : Cited References: 21. - This work was supported by RFBR (grant nos. 12-05-00502a and 14-05-00151a).
Предметные рубрики: MOIST SOILS
FREQUENCY
MODEL
TEMPERATURE
SALINITY
RANGE
GHZ
Ключевые слова (''Своб.индексиров.''): conductivity--dielectric permittivity--multifrequency dielectric relaxation--oil-bearing deposits--sandy-clayey rocks
Аннотация: Experimental measurements of the dielectric permittivity and equivalent conductivity of sandy-clayey samples (a mixture of river sand with bentonite or kaolin) saturated with salt-solution-diesel-fuel emulsions were performed in the frequency range from 10 kHz to 1 GHz at temperatures of 25-65 °C. It is shown that when the content of the salt solution in the saturating fluid does not exceed 10%, the dielectric permittivity in the frequency range from 1 MHz to 1 GHz depends little on the mineral composition of the sample and on the concentration of the saturating solution. When the portion of water is 33.3% or higher, increasing the concentration of the salt solution leads to an increase in the equivalent conductivity and the real part of the complex dielectric permittivity. Using the refractive model of the complex dielectric permittivity, we have estimated the dielectric properties of bound water, which depend on temperature and the type of clay (bentonite or kaolin) in the sand-clay mixture but are independent of the water saturation and the amount of clay in the sample.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mironov V. L., Bobrov P. P., Fomin S. V., Karavaiskii A. Yu.
Заглавие : Generalized refractive mixing dielectric model of moist soils considering ionic relaxation of soil water
Место публикации : Rus. Phys. J. - 2013. - Vol. 56, Is. 3. - P.319-324. - DOI 10.1007/s11182-013-0034-4
Аннотация: A generalized multi-relaxation refractive mixing dielectric model of moist soils is suggested for frequencies in the range from 0.2 to 14.8 GHz. The model is based on dielectric measurements in this frequency range at a temperature of 20A degrees D for relative moisture content (by weight) changing from 2 to 43%. The model expands the range of applicability of the single-relaxation model suggested previously to the megahertz frequency range with allowance for the Maxwell-Wagner ionic relaxation which is clearly manifested in this frequency range for bound soil water. It is demonstrated that the error in calculating the complex dielectric permittivity spectra of the moist soil has the same order of magnitude as the error of experimental data used for model construction.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mironov V. L., Bobrov P. P., Fomin S. V.
Заглавие : Dielectric model of moist soils with varying clay content in the 0.04 to 26.5 GHz frequency range
Коллективы : International Siberian Conference on Control and Communications
Место публикации : Int. Sib. Conf. on Control and Communicat.: Proc. - 2013. - Ст.6693613. - ISSN 978-1-4799-1060-1, DOI 10.1109/SIBCON.2013.6693613. - ISSN 978-14799-1062-5
Примечания : This work was supported by the Program of the Siberian Branch of the Russian Academy of Sciences, 2013-2016. Project II.12.1.1. - Загл. с этикетки диска
Ключевые слова (''Своб.индексиров.''): moist soil--dielectric model--dielectric spectra--dielectric relaxations--bound soil water--free soil water
Аннотация: In this paper, a soil texture dependent multirelaxation generalized refractive mixing dielectric model (MR GRMDM) for moist soils was developed. The model provides for complex permittivity of moist soils in both the gigahertz and megahertz frequency ranges, namely, from 40 MHz to 26.5 GHz.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mironov V. L., Bobrov P. P., Fomin S. V.
Заглавие : Multirelaxation generalized refractive mixing dielectric model of moist soils
Место публикации : IEEE Geosc. Remote Sens. Letters. - 2013. - Vol. 10, Is. 3. - Ст.6332477. - P.603-606. - ISSN 1545-598X, DOI 10.1109/LGRS.2012.2215574
Ключевые слова (''Своб.индексиров.''): bound soil water--dielectric model--dielectric relaxations--dielectric spectra--free soil water--moist soil--bound waters--complex dielectric constant--debye relaxation--dielectric models--dielectric spectra--dipole relaxation--frequency ranges--gigahertz frequencies--gigahertz range--moist soil--soil water--spectroscopic parameters--water molecule--dielectric relaxation--mixing--molecules--soil moisture--geologic models
Аннотация: In this letter, a multirelaxation generalized refractive mixing dielectric model (GRMDM) for moist soil is proposed and substantiated in the frequency range from 0.04 to 26.5 GHz. This model is based on the methodology of a single-relaxation GRMDM which accounts only for the dipole relaxation of water molecules in the gigahertz frequency range. The proposed multirelaxation GRMDM takes into account both the dipole (Debye) and ionic (Maxwell-Wagner) relaxations of soil water molecules. For this purpose, it uses a two-frequency Debye relaxation equation for the dielectric spectra of bound water. The spectroscopic parameters of the multirelaxation GRMDM were derived by fitting the spectra calculated by this model to the respective measured ones. The main advantage of this model is that it predicts the complex dielectric constant of moist soils throughout the megahertz and gigahertz frequency ranges with the same error as the single-relaxation GRMDM does only in the gigahertz range.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Бобров, Павел Петрович, Миронов, Валерий Леонидович, Ященко, Александр Сергеевич
Заглавие : Алгоритм восстановления влажности почв по радиояркостной температуре, измеренной спутником smos и его сравнение со штатным алгоритмом SMOS
Место публикации : Изв. вузов. Физика. - 2012. - Т. 55, № 8/3. - С. 145-148
Аннотация: На основании изучения данных уровней 1с и 2 спутника SMOS по территории юга Западной Сибири за период с 29.09.10 г. по 10.11.11г., периодических наземных измерений яркостной температуры на частоте 1,4 ГГц и прямых измерений влажности сделаны выводы об основных недостатках данных уровня Level 2. Предложен простой алгоритм дистанционного определения влажности почв по значениям яркостной температуры на уровне Level 1c и проведено его тестирование с использованием данных о влажности почвы, приводимых на уровне Level 2, и отдельными результатами прямых измерений влажности.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Бобров, Павел Петрович, Миронов, Валерий Леонидович, Ященко, Александр Сергеевич
Заглавие : Статистический анализ данных спутника SMOS о яркостной температуре территории юга Омской области и Северного Казахстана
Место публикации : Изв. вузов. Физика. - 2012. - Т. 55, № 8/3. - С. 142-144
Ключевые слова (''Своб.индексиров.''): микроволновая радиометрия--влажность почв
Аннотация: Изучено около 400 радиометрических снимков SMOS на частоте 1,4 ГГц. Проведен анализ данных уровня 1с, привязанных к координатной сетке и обработанных с учётом влияния атмосферы. Обнаружено, что значительные отклонения от стандартной угловой зависимости наблюдаются для территории Северного Казахстана. Показано, что для этой же территории наблюдаются аномально высокие значения яркостной температуры (более 400 К). Проведен анализ временных рядов яркостной температуры в периоды оттаивания и высыхания почвы. Выявлено отклонение значений диэлектрической проницаемости почвы, приводимых на Level 2, от измеренных в лабораторных условиях.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Bobrov P. P., Mironov V. L., Yashchenko A. S., Kosolapova L. G.
Заглавие : Comparison of Two Retrieval Soil Moisture Algorithms on SMOS Data
Коллективы : IEEE International Geoscience and Remote Sensing Symposium (2012 ; July ; 22-27; Munich, Germany)
Место публикации : IEEE International Geoscience and Remote Sensing Symposium (IGRASS): Proceedings. - Munich, 2012. - С. 1131-1134. - ISBN 978-1-4673-1159-5, DOI 10.1109/IGARSS.2012.6351349
Аннотация: We made the conclusion about the main deficiencies of the SMOS data Level 1c and Level 2 for the south part of Western Siberia. This was done for the period from 12.07.10 to 10.11.11 by studying SMOS data, periodic ground base measurements of the brightness temperature at 1.4 GHz and ground base measurements of moisture. We developed a simple algorithm for remote retrieval of soil moisture using data of brightness temperature given at SMOS Level 1c, compared the data of soil moisture, given at SMOS Level 2 with data calculated by our algorithm and in situ measurements of moisture.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Mironov V. L., Bobrov P. P., Fomin S. V.
Заглавие : Multi-relaxation generalized refractive mixing dielectric model of moist soils
Коллективы : IEEE International Geoscience and Remote Sensing Symposium (2012 ; July ; 22-27; Munich, Germany)
Место публикации : IEEE International Geoscience and Remote Sensing Symposium (IGRASS): Proceedings. - Munich, 2012. - P.5177-5179. - ISBN 978-1-4673-1159-5, DOI 10.1109/IGARSS.2012.6350887
Аннотация: In this paper, a multi-relaxation generalized refractive mixing dielectric model (GRMDM) for moist soil is proposed and substantiated in the frequency range from 0.03 to 26.5 GHz. This model is based on the GRMDM of [1] developed in the range of GHz frequencies, considering only the dipole relaxation of water in the soil. The error of this model was shown to noticeably increase with the transition to the MHz range. Because in this range, one more relaxation, that is, ionic (Maxwell-Wagner) relaxation largely affects on the complex dielectric constant. The multi-frequency relaxation GRMDM developed in this paper compensates for this disadvantage of the single-relaxation GRMDM. In this model, the two-frequency relaxation Debye equation for the dielectric spectra of bound water has been used, thus expanding the scope of the GRMDM to the MHz range. The main advantage of this model is that it predicts complex dielectric constant of moist soils simultaneously in the GHz and MHz ranges.
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