Abstract: This article presents the impact of rain attenuation contributing to the overall loss of signal propagation along Earth-space paths in Poland in the area of Kielce city. This area is the representative region in Poland, especially due to the central location, environment and morphology of terrain. Close to this city from 1974 at Psary-Kąty, was a large satellite ground station, operated by TP SA once, with up to seven large parabolic antennas. In the general theory the presence of rainfall has an influence on the quality of microwaves links. In this paper we present the example result measurements to show the impact of rainfall intensity on the horizontally and vertically polarized radio waves in both (upper and lower) frequency band. In practice the quality coefficients allow to determine the reception range of digital satellite systems. We can estimate the influence of rain intensity on the quality coefficients signal such as: Channel power, CNR (Carrier-to-Noise Ratio), MER (Modulation Error Ratio), CBER (BER before FEC – Forward Error Correction, Channel BER), VBER (BER after Viterbi, Viterbi BER) and LBER (BER after LDPC – Low Density Parity Check). In future all collected data can be used to determine the impact of rainfall intensity, polarization and frequency of microwaves on the received satellite signal quality to provide information about signal attenuation due to rain.
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