Retrieving Water Vapor From an E‐Band Microwave Link With an Empirical Model Not Requiring In Situ Calibration

Abstract An empirical model estimating water vapor density from the attenuation of electromagnetic waves at E‐band frequencies is proposed and tested on seven months of 5‐min attenuation observations from a 4.87‐km‐long full‐duplex E‐band commercial microwave link (CML) operating at 73.5 and 83.5 GH...

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Autores principales:	Martin Fencl, Michal Dohnal, Vojtěch Bareš
Formato:	article
Lenguaje:	EN
Publicado:	American Geophysical Union (AGU) 2021
Materias:	water vapor density opportunistic sensing commercial microwave link E‐band retrieval model Astronomy QB1-991 Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/3d34b36b511f4348826adc574e0e0697
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id	oai:doaj.org-article:3d34b36b511f4348826adc574e0e0697
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spelling	oai:doaj.org-article:3d34b36b511f4348826adc574e0e06972021-11-23T21:03:07ZRetrieving Water Vapor From an E‐Band Microwave Link With an Empirical Model Not Requiring In Situ Calibration2333-508410.1029/2021EA001911https://doaj.org/article/3d34b36b511f4348826adc574e0e06972021-11-01T00:00:00Zhttps://doi.org/10.1029/2021EA001911https://doaj.org/toc/2333-5084Abstract An empirical model estimating water vapor density from the attenuation of electromagnetic waves at E‐band frequencies is proposed and tested on seven months of 5‐min attenuation observations from a 4.87‐km‐long full‐duplex E‐band commercial microwave link (CML) operating at 73.5 and 83.5 GHz. The model does not require in situ calibration. Estimated water vapor density is compared to the observations from two meteorological stations located nearby the CML end nodes. Best performance is achieved for the 83.5 GHz sublink (RMSE = 1.46 g m−3, R2 = 0.85) when the actual temperature is used as a model input, in addition to the attenuation data. Use of temperature averaged over the whole evaluation period resulted in significantly worse performance. The study demonstrates the potential of E‐band CMLs for measuring near‐surface air humidity and the need for careful quality control when upscaling the water vapor monitoring to the entire network of E‐band CMLs.Martin FenclMichal DohnalVojtěch BarešAmerican Geophysical Union (AGU)articlewater vapor densityopportunistic sensingcommercial microwave linkE‐bandretrieval modelAstronomyQB1-991GeologyQE1-996.5ENEarth and Space Science, Vol 8, Iss 11, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	water vapor density opportunistic sensing commercial microwave link E‐band retrieval model Astronomy QB1-991 Geology QE1-996.5
spellingShingle	water vapor density opportunistic sensing commercial microwave link E‐band retrieval model Astronomy QB1-991 Geology QE1-996.5 Martin Fencl Michal Dohnal Vojtěch Bareš Retrieving Water Vapor From an E‐Band Microwave Link With an Empirical Model Not Requiring In Situ Calibration
description	Abstract An empirical model estimating water vapor density from the attenuation of electromagnetic waves at E‐band frequencies is proposed and tested on seven months of 5‐min attenuation observations from a 4.87‐km‐long full‐duplex E‐band commercial microwave link (CML) operating at 73.5 and 83.5 GHz. The model does not require in situ calibration. Estimated water vapor density is compared to the observations from two meteorological stations located nearby the CML end nodes. Best performance is achieved for the 83.5 GHz sublink (RMSE = 1.46 g m−3, R2 = 0.85) when the actual temperature is used as a model input, in addition to the attenuation data. Use of temperature averaged over the whole evaluation period resulted in significantly worse performance. The study demonstrates the potential of E‐band CMLs for measuring near‐surface air humidity and the need for careful quality control when upscaling the water vapor monitoring to the entire network of E‐band CMLs.
format	article
author	Martin Fencl Michal Dohnal Vojtěch Bareš
author_facet	Martin Fencl Michal Dohnal Vojtěch Bareš
author_sort	Martin Fencl
title	Retrieving Water Vapor From an E‐Band Microwave Link With an Empirical Model Not Requiring In Situ Calibration
title_short	Retrieving Water Vapor From an E‐Band Microwave Link With an Empirical Model Not Requiring In Situ Calibration
title_full	Retrieving Water Vapor From an E‐Band Microwave Link With an Empirical Model Not Requiring In Situ Calibration
title_fullStr	Retrieving Water Vapor From an E‐Band Microwave Link With an Empirical Model Not Requiring In Situ Calibration
title_full_unstemmed	Retrieving Water Vapor From an E‐Band Microwave Link With an Empirical Model Not Requiring In Situ Calibration
title_sort	retrieving water vapor from an e‐band microwave link with an empirical model not requiring in situ calibration
publisher	American Geophysical Union (AGU)
publishDate	2021
url	https://doaj.org/article/3d34b36b511f4348826adc574e0e0697
work_keys_str_mv	AT martinfencl retrievingwatervaporfromanebandmicrowavelinkwithanempiricalmodelnotrequiringinsitucalibration AT michaldohnal retrievingwatervaporfromanebandmicrowavelinkwithanempiricalmodelnotrequiringinsitucalibration AT vojtechbares retrievingwatervaporfromanebandmicrowavelinkwithanempiricalmodelnotrequiringinsitucalibration
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Retrieving Water Vapor From an E‐Band Microwave Link With an Empirical Model Not Requiring In Situ Calibration

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