Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2023, Vol. 20, No. 1, pp. 67-75
Correction of distortions of the spectra of thermal radiation of the atmosphere obtained from the data of the R22M radiometer-spectrometer under rapidly changing hydrometeorological conditions
D.M. Ermakov
1, 2 , M.T. Smirnov
2, 1 1 Space Research Institute RAS, Moscow, Russia
2 Kotelnikov Institute of Radioengineering and Electronics RAS, Fryazino Branch, Fryazino, Moscow Region, Russia
Accepted: 13.02.2023
DOI: 10.21046/2070-7401-2023-20-1-67-75
An approach is presented for reconstructing the “instantaneous” spectra of the atmosphere’s own microwave radiation in non-stationary states based on the measurements of the R22M radiometer in the frequency range of 18–27.2 GHz. An algorithm for temporal interpolation of measurements has been developed that effectively brings data in all frequency channels to a single point in time, and a criterion for the quality of interpolation based on a comparison of independently measured low- and high-frequency branches of the spectrum has been proposed. The processing of sample data from calibration sessions and observations of the atmosphere with the R22M instrument was carried out, and a high quality of the proposed algorithm was shown. Spectra correction errors are estimated at 0.1–0.3 K, which is comparable with the radiometric measurement error in the instrument channels. Thus, the possibility of studying the “instantaneous” spectra of natural microwave radiation of the atmosphere in the range of 18–27.2 GHz in complex, rapidly changing hydrometeorological conditions with high spectral resolution and satisfactory radiometric accuracy has been opened.
Keywords: R22M, atmospheric microwave spectrometry, data interpolation, complex weather conditions
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