Precipitation Estimates From Commercial Microwave Links: Practical Approaches to Wet-Antenna Correction
| Autor: | Jaroslav Pastorek, Martin Fencl, Jörg Rieckermann, Vojtech Bares |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
engrXiv|Engineering
bepress|Engineering|Civil and Environmental Engineering bepress|Engineering bepress|Engineering|Electrical and Computer Engineering engrXiv|Engineering|Electrical and Computer Engineering engrXiv|Engineering|Civil and Environmental Engineering General Earth and Planetary Sciences Environmental science Precipitation Electrical and Electronic Engineering Antenna (radio) Microwave Remote sensing |
| Zdroj: | IEEE Transactions on Geoscience and Remote Sensing. 60:1-9 |
| ISSN: | 1558-0644 0196-2892 |
| Popis: | An inadequate correction for wet antenna attenuation (WAA) often causes a notable bias in quantitative precipitation estimates (QPEs) from commercial microwave links (CMLs) limiting the usability of these rainfall data in hydrological applications. This paper analyzes how WAA can be corrected without dedicated rainfall monitoring for a set of 16 CMLs. Using data collected over 53 rainfall events, the performance of six empirical WAA models was studied, both when calibrated to rainfall observations from a permanent municipal rain gauge network and when using model parameters from the literature. The transferability of WAA model parameters among CMLs of various characteristics has also been addressed. The results show that high-quality QPEs with a bias below 5% and RMSE of 1 mm/h in the median could be retrieved, even from sub-kilometer CMLs where WAA is relatively large compared to raindrop attenuation. Models in which WAA is proportional to rainfall intensity provide better WAA estimates than constant and time-dependent models. It is also shown that the parameters of models deriving WAA explicitly from rainfall intensity are independent of CML frequency and path length and, thus, transferable to other locations with CMLs of similar antenna properties. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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