3 October 2017 Weather radar performance monitoring using a metallic-grid ground-scatterer
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The use of ground return signals is investigated for checks on the calibration of power measurements of a polarimetric C-band radar. To this aim, a peculiar permanent single scatterer (PSS) consisting of a big metallic roof with a periodic mesh grid structure and having a hemisphere-like shape is considered. The latter is positioned in the near-field region of the weather radar and its use, as a reference calibrator, shows fairly good results in terms of reflectivity and differential reflectivity monitoring. In addition, the use of PSS indirectly allows to check for the radar antenna de-pointing which is another issue usually underestimated when dealing with weather radars. Because of the periodic structure of the considered PSS, simulations of its electromagnetic behavior were relatively easy to perform. To this goal, we used an electromagnetic Computer-Aided-Design (CAD) with an ad-hoc numerical implementation of a full-wave solution to model our PSS in terms of reflectivity and differential reflectivity factor. Comparison of model results and experimental measurements are then shown in this work. Our preliminary investigation can pave the way for future studies aiming at characterizing ground-clutter returns in a more accurate way for radar calibration purposes.
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Marta Tecla Falconi, Marta Tecla Falconi, Mario Montopoli, Mario Montopoli, Frank Silvio Marzano, Frank Silvio Marzano, Luca Baldini, Luca Baldini, } "Weather radar performance monitoring using a metallic-grid ground-scatterer", Proc. SPIE 10426, Active and Passive Microwave Remote Sensing for Environmental Monitoring, 104260B (3 October 2017); doi: 10.1117/12.2282163; https://doi.org/10.1117/12.2282163

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