Excess Attenuation Statistics of Earth-Space Propagation Experiments at Ka-Band over Tropical Locations: Shillong and Hassan, India
Résumé
Contributions to the GSAT 14 Ka-band propagation campaign, designed and carried out by ISRO, has been conducted by ONERA in Shillong (25.6750°N, 91.9136°E), and CNES in Hassan, India since 2015. Two beacon Earth stations operating at 20.2 GHz, and 30.5 GHz, a profiling radiometer, and a rain gauge are available at the experiment site. Two beacon receivers at 20.2 GHz and 30.5 GHz measure the received signal strength with a 10-Hz sampling rate. In the present paper, rain rate and copolar attenuation data have been analysed. Details of the instruments and methodology of the data analysis have been described. A case study in terms of time series variation of rain rate, and copolar attenuation has been shown. The complementary cumulative distribution function (CCDF) of rain rate and copolar attenuation for the total study period has been calculated and compared with ITU-R model. A high year to year variability has been observed. The experimental CCDF shows good matches with Rec. ITU-R P.618-13 above 0.1 % of time exceedance over Shillong. The comparison of 30.5 GHz copolar attenuation data with ITU-R frequency scaling model shows a good match. Difference has been observed between experimental data and ITU-R model over Hassan.
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