E.A. Rostokina1, E.V. Fedoseeva2, G.G. Shchukin3, I.N. Rostokin4, M.A. Matyukov5

1-5 Murom Institute (branch) of the Vladimir State University named after A.G. and N.G. Stoletov (Murom, Russia)

3 A.F. Mozhaisky Military Space Academy (St. Petersburg, Russia)

1 arostokina@yandex.ru; 2 elenafedoseeva@yandex.ru; 3 ggshchukin@mail.ru; 4 rostockin.ilya@yandex.ru; 5 maks.matyukov@mail.ru

Microwave radiometric systems are designed to probe the surrounding space by measuring the power of its own radio-thermal radiation of the study area, which determines the low power level of the input signal of the system and the requirement to minimize losses in the antenna-feeder path. The peculiarity of their functioning is the same noise character of both the information signal - the antenna input signal, caused by the reception of radio-thermal radiation from the angular region of the main lobe of the antenna radiation pattern, and the noise received by the antenna in the scattering region of the antenna radiation pattern.

Objective. Optimization of parameters of the antenna mode splitter of the microwave radiometric system with compensation of the influence of phono interference by means of the software-implemented electrodynamic modeling in the software package "Microwave Studio". Analysis of the functional purpose of the mode splitter elements and limitations on the introduced adjustments of their sizes; creation of the model in the software package "Microwave Studio"; step-by-step adjustment of the sizes and location of the mode splitter elements in order to optimize the S-parameters. This paper presents the results of step-by-step optimization of the mode splitter of the microwave radiometric system with compensation of background noise for three frequencies 4 GHz, 9.375 GHz, 22 GHz for the possibility of building a system that can receive radio-thermal radiation in three frequency ranges.

Practical significance Results. This paper presents the results of step-by-step optimization of the mode splitter of the microwave radiometric system with compensation of background noise for three frequencies 4 GHz, 9.375 GHz, 22 GHz for the possibility of building a system that can receive radio-thermal radiation in three frequency ranges. The conducted researches allowed to make an optimized version of the multi-frequency dual-mode microwave radiometric system of remote sensing of the atmosphere.

The research was supported by the Russian Science Foundation grant No. 21-19-00378, https://rscf.ru/project/21-19-00378/.

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