Abstract
The design principle of multichannel radiometric systems based on the null measurement method is described. A four-channel (with four receivers) microwave radiometer of the decimeter wave band, which uses combined pulse-amplitude and pulse-width modulations, is described. The procedure of its internal calibration using two standards is considered. The radiometer is characterized by a twofold higher fluctuation sensitivity relative to the single-channel circuit and by a better reliability.
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Filatov, A.V., Nulevoi metod v radiometricheskikh izmereniyakh (The Null Measurement Method in Radiometric Measurements), Tomsk: TUSUR, 2010.
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Original Russian Text © A.V. Filatov, A.V. Ubaichin, D.E. Paraev, 2012, published in Pribory i Tekhnika Eksperimenta, 2012, No. 1, pp. 67–72.
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Filatov, A.V., Ubaichin, A.V. & Paraev, D.E. A microwave four-channel null L-band radiometer. Instrum Exp Tech 55, 59–64 (2012). https://doi.org/10.1134/S0020441211060066
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DOI: https://doi.org/10.1134/S0020441211060066