Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2020, Vol. 17, No. 3, pp. 145-148
Remote sensing of moisture profiles in the arable soil layer based on polarimetric observations of the reflection coefficient in the P- and C-bands. Experiment
1 L.V. Kirensky Institute of Physics SB RAS, Krasnoyarsk, Russia
Accepted: 13.05.2020
DOI: 10.21046/2070-7401-2020-17-3-145-148
This report experimentally confirmed the fundamental possibility of remote sensing of moisture profiles in the arable soil layer with practical acceptable accuracy based on polarimetric measurements of the reflection coefficient at two frequencies of 630 MHz and 5.4 GHz. Reflection coefficients were measured at an angle of 35° by the impulse method, during natural cycles of the evaporation and moistening of soil arable layer in a plot of an agricultural field under steam in the area of Minino village, Krasnoyarsk region. Soil moisture profiles were retrieved in the course of solving the inverse problem, in which cost function was the ratio of the backscattering coefficients taken on coincident linear polarizations. The ratio of the backscattering coefficients was estimated by the scalar Kirchhoff approximation in the form of a ratio of power reflection coefficients, which were measured on horizontal and vertical polarizations. The standard deviation and the determination coefficient between the retrieved and measured soil moisture in the 10 cm topsoil were 2.2 % and 0.91, respectively. The study shows the prospects of developing polarimetric multi-frequency radar systems of combined UHF and SHF bands for remote sensing of moisture profiles in the arable layer of soils.
Keywords: radar, unmanned aerial vehicle, agricultural soils, soil moisture, arable layer, dielectric constant
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