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Telecommunications and Radio Engineering
SJR: 0.202 SNIP: 0.2 CiteScore™: 0.23

ISSN Imprimer: 0040-2508
ISSN En ligne: 1943-6009

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v74.i17.40
pages 1535-1543

DISAMBIGUATION OF INVERSE PROBLEM SOLUTION FOR RETRIEVAL OF RAIN INTENSITY USING DOUBLE FREQUENCY RADAR SENSING

G. I. Khlopov
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkiv 61085, Ukraine
G. B. Veselovska
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkiv 61085, Ukraine
O. A. Voitovych
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkiv 61085, Ukraine

RÉSUMÉ

Dependence of radar cross section of rain drops on their diameter was analyzed for different wavelengths using numerical simulation. It is shown that in the short microwave range (λ < 3.2cm) the dependence has nonmonotonic character due to resonant scattering of electromagnetic waves by rain drops. Using the combination of operating wavelengths λ1 = 3.2 cm, λ2 = 10 cm, and λ1 = 5.5 cm, λ2 = 10 cm does not allow to apply a double-frequency method of remote sensing for retrieval of rain microstructure parameters, because the dependence of the differential radar cross-section weakly depends on drop dimensions. The system of inequalities was obtained, which permits to solve the ambiguity problem in the case of intensity retrieval by double-frequency sensing using shorter wavelength λ1 = 8 mm. It is shown that the use of the long-wave range of microwaves leads to decrease of the radar reflectivity for small raindrops that requires a significant increasing of power budget of meteorological radar and toughens up the requirements for measurement accuracy.


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