Abstract
We consider the possibilities of using a broadband noise signal to measure the moisture of low-salinity soils in the presence of groundwater. We estimate the dependence of the dielectric permittivity of a soil in the meter-wavelength range (P-band) on the wavelength and salinity. We obtain an approximate expression for determination of the sounding depth and formulate requirements for the frequency band to reduce the effect of reflection from groundwater. The results of experimental measurement of the dependence of the reflection coefficient of low-salinity soils on the moisture at a frequency of 300 MHz are presented. It is found that the reflection coefficient correlates well with the soil moisture in a near-surface layer of thickness about 60 cm. It is shown that under such conditions, the use of wavelengths greater than 1-1.5 m for determination of the soil moisture is not reasonable.
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Belyaeva, T.A., Bobrov, P.P. & Schetkin, I.M. Active Measurements of Moisture in Low-Salinity Soils Using a Meter-Wave Noise Signal. Radiophysics and Quantum Electronics 43, 871–878 (2000). https://doi.org/10.1023/A:1010353317981
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DOI: https://doi.org/10.1023/A:1010353317981