RESULTS OF 20 12.5 AND 30/20-GHZ XPD-FREQUENCY SCALING MEASUREMENTS WITH THE OLYMPUS SATELLITE/

This contribution reports on three years of crosspolar discrimination (XPD) frequency-scaling measurements in Germany performed by the Resea rch Center of Deutsche Telekom. Concurrent measurements were carried o ut at 12.5, 20 and 30 GHz using the OLYMPUS satellite. Two different t ypes of 20/12.5 and 30/20 GHz statistics were analyzed: 1) equiprobabi lity and 2) instantaneous XPD-frequency scaling statistics. The result s of equiprobability crosspolar scaling studies for total and ice depo larization are in reasonable agreement with the scaling laws proposed by ITU-R with some deviations, however, depending on the depolarizatio n mechanism. In addition, a variability analysis of instantaneous XPD scaling factors was carried out from their joint conditional distribut ions, showing the spread which can be expected in long-term scaled XPD statistics. Although total depolarization is strongly affected by ice , the variation of the scaled data is relatively small since the scali ng behavior of rain and ice depolarization is very similar in the cons idered frequency range.