학술논문
Advanced Microwave Radiometry: Refining Sun-Tracking Technique for Atmospheric Attenuation Retrieval and Sun Brightness Temperature Estimation
Document Type
Conference
Source
2024 18th European Conference on Antennas and Propagation (EuCAP) Antennas and Propagation (EuCAP), 2024 18th European Conference on. :1-5 Mar, 2024
Subject
Language
Abstract
Sun-Tracking (ST) is a novel ground-based microwave radiometric technique that allows the retrieval of the slant-path atmospheric attenuation in all-weather conditions as well as the estimation of the Sun brightness temperature. This work proposes a refinement procedure of the ST technique based on taking into account the Sun's angular size variability throughout the year. We have obtained a reduction up to more than 50% of the standard deviation of the estimated Sun's brightness temperature. On the other hand, we have demonstrated that the approximation of a constant value for the Sun's angular size, that strongly limits the precision of the Sun brightness temperature estimation, is acceptable for the ST-based attenuation retrieval algorithm. The study is performed exploiting a three-years dataset of ST measurements collected in Rome NY between 2015 and 2018 at 23.8 (K-band), 31.4 (Ka-band), 72.5 (V-band), and 82.5 (W-band) GHz.