研究目的
To get so far not unavailable empirical local statistic of rain attenuation that can be applied to verify accuracy of relevant statistical propagation models that will be utilized for a design of mm wave link networks.
研究成果
The long-term statistics of attenuation due to hydrometeors in three mm wave bands were obtained from the measured received power levels on terrestrial microwave links in Prague. The measured attenuation levels are slightly larger than predicted by the ITU-R P.530, possibly caused by a higher incidence of stronger rain events. The differences between rain attenuation at 94 and 122 GHz bands are observed to be relatively smaller, consistent with a saturation of attenuation vs frequency characteristics occurring around 100 GHz.
研究不足
The predicted attenuation levels are apparently lower than the levels of empirical distributions, and the differences between rain attenuation at 94 and 122 GHz bands are observed to be relatively smaller, indicating a saturation of attenuation vs frequency characteristics occurring around 100 GHz.
1：Experimental Design and Method Selection:
The experiment involves measuring received signal variations on terrestrial radio links operating in three frequency bands around 58, 94 and 122 GHz to determine attenuation of electromagnetic waves in microwave bands.
2：Sample Selection and Data Sources:
The data are collected from long-term rain attenuation/intensity measurements on three mm-wave links in Prague.
3：List of Experimental Equipment and Materials:
Includes terrestrial microwave links operating at 58 GHz, 94 GHz, and 122 GHz, automatic gain control (AGC) voltage measurement using an A/D converter on a PC card, and two tipping bucket heated rain gauges.
4：Experimental Procedures and Operational Workflow:
The nominal received signal level was determined as a monthly median value of the RSL, and rain intensity is measured simultaneously near the receivers.
5：Data Analysis Methods:
The measured time series of attenuation are processed to obtain long-term cumulative distributions of attenuation due to hydrometeors, and a power-law relationship between attenuation and rain intensity is obtained by a least square approximation.
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