研究目的
To compare statistics of measured radio signal attenuation and theoretical attenuation calculated from rainfall observations using the ITU-R P.838 Recommendation formulas.
研究成果
The comparison shows systematic underestimation of attenuation as calculated by theoretical formulas compared to measurement. This difference is in the range of 1 dB to 3 dB for 1 % probability level and in the range of 4 dB to 10 dB for 0.01 % probability level. The difference is assumed to be largely caused by neglecting the effect of antenna wetting.
研究不足
The spatial distribution of rain may not be constant along the link path, which is an uncertainty when comparing measured and predicted attenuation by rain. The difference between measurement and theory is assumed to be largely caused by neglecting the effect of antenna wetting.
1：Experimental Design and Method Selection:
The study compares measured attenuation on commercial microwave links with theoretical attenuation calculated from rainfall observations using ITU-R P.838 formulas.
2：Sample Selection and Data Sources:
Data from 17 commercial microwave links operated by a mobile network operator at 32 GHz and 38 GHz frequencies over two years were analyzed. Rainfall data were obtained from a dense network of rain gauges.
3：List of Experimental Equipment and Materials:
Antennas manufactured by Ericsson with a diameter of 30 cm were used.
4：Experimental Procedures and Operational Workflow:
Measurement data of transmitted and received power levels were collected and recorded with a resolution of 1 minute. Rain rate data were also collected with a resolution of 1 minute.
5：Data Analysis Methods:
The theoretically predicted attenuation due to rain was calculated using measured rain rate for each probability level and the formula for rain attenuation, taking into consideration the length of each particular link.
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