研究目的
To study Earth-space propagation impairments in equatorial areas at Ka-band frequencies, specifically analyzing rainfall rate and rain attenuation distributions for satellite communication systems.
研究成果
The first year of measurements shows significant rainfall and attenuation variability in equatorial areas, with good agreement with ITU-R P.618-13 predictions. Future work will include analyzing gaseous attenuation, inter-annual variability, and fade dynamics to better understand propagation impairments for satellite communications.
研究不足
The dynamic range of the beacon receiver limits measurements for probabilities below 0.1%; the receiver uses linear polarization leading to a 3 dB loss; wetting effects on the antenna may occur but are mitigated with a water discharge hole; the experiment is limited to one year of data with plans for extension to three years.
1：Experimental Design and Method Selection:
The experiment involves deploying a rain gauge and a beacon receiver to measure rainfall rate and signal attenuation at
2：2 GHz from the Amazonas 3 satellite. Data processing includes filtering and interpolation to extract concurrent time series. Sample Selection and Data Sources:
Measurements are taken at the Guiana Space Centre in Kourou, French Guiana, from January 2017 to December
3：List of Experimental Equipment and Materials:
20 Includes a rain gauge (dual-chamber tipping bucket type), a beacon receiver with a
4：9 m prime focus parabolic antenna, a Ka-band to L-band Low Noise Block-Converter, and a GNSS receiver installed later for water vapor estimation. Experimental Procedures and Operational Workflow:
Equipment is set up to record data at 10 Hz sampling rate; rain gauge tips are converted to rainfall rate; beacon signal is processed to obtain attenuation by subtracting a reference level and filtering out scintillation.
5：Data Analysis Methods:
Statistical analyses include calculating Complementary Cumulative Distribution Functions (CCDFs) for rainfall rate and attenuation, and comparisons with ITU-R recommendations using methods like linear interpolation and filtering.
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