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- Title
Water vapor estimation based on one-year data of E-band millimeter-wave link in the northeast of China.
- Authors
Siming Zheng; Juan Huo; Wenbing Cai; Yinhui Zhang; Peng Li; Gaoyuan Zhang; Baofeng Ji; Jiafeng Zhou; Congzheng Han
- Abstract
The amount of water vapor in the atmosphere is very small, but its content varies greatly in different humidity areas. The change of water vapor will affect the transmission of microwave link signals, and most of the water vapor is concentrated in the lower layer, so the water vapor density can be measured by the change of the near-ground microwave link transmission signal. This study collected one-year data of the E-band millimeter-wave link in Hebei, China, and used a model based on the ITU-R to estimate the water vapor density. An improved method of extracting the water vapor induced attenuation value is also introduced. It has a higher time resolution and the estimation error is lower than the previous method. In addition, this paper conducts the seasonal analysis of water vapor inversion for the first time. The monthly and seasonal evaluation index results show a high correlation between the retrieved water vapor density the actual water vapor density value measured by the local weather station. The correlation value for the whole year is up to 0.95, the root mean square error is as low as 0.35, and the average relative error is as low as 0.05. This research shows that millimeter-wave backhaul link provides high-precision data for the measurement of water vapor density and has a positive effect on future weather forecast research.
- Subjects
HEBEI Sheng (China); WATER vapor; VAPOR density; STANDARD deviations; METEOROLOGICAL research; METEOROLOGICAL stations; WEATHER forecasting
- Publication
Atmospheric Measurement Techniques Discussions, 2021, p1
- ISSN
1867-8610
- Publication type
Article
- DOI
10.5194/amt-2021-305