Rain Depolarization Characteristics Related to Rainfall Types on Ka-Band Satellite-to-Ground Path (Special Issue on 1992 International Symposium on Antennas and Propagation)

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概要

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• Observations of rain depolarization characteristics were conducted using the CS-2 and CS-3 beacon signals (19.45 GHz, circular polarization, elevation angle=49.5°) during seven years of 1986-1992 at Neyagawa, Osaka. The mean cross-polar phase relative to the co-polar phase of each rainfall event is distributed in a comparatively wide range from -100° to -150°. This large variation is suggested to be caused by the difference of raindrop size distribution (DSD) in addition to that of rain intensity. The effects of DSD are examined by rain attenuation statistics for specific months, together with direct measurements of raindrop diameters on the ground for several rainfall events. Compared with representative DSD models, the effects of the Joss-drizzle type with relatively small raindrops primarily appear in "Baiu (Tsuyu)" period, while the effects of the Marshall-Palmer type which represents a standard type are enhanced in "Shurin (Akisame)" period. On the other hand, the effects of the Joss-thunderstorm type with comparatively large raindrops do not indicate a very clear seasonal variation. Possible improvements of XPD performed by differential phase shifters are generally found to be lower than 10 dB for the rain depolarization due to the effect of residual differential attenuation after the cancellation of differential phase shift. Such XPD improvements are, however, very sensitive to the type of DSD, and it is suggested that the improvements are at least greater than dB for the Joss-drizzle type, whereas they are less than 6 dB for the Marshall-Palmer and Joss-thunderstorm types. The effects of the XPD improvements are thus related to rainfall types, i.e., the type of DSD, and the improvements are considerably dependent upon the seasons in which each rainfall type frequently appears.

• 社団法人電子情報通信学会の論文
• 1993-12-25

著者

• MAEKAWA Yasuyuki

  Osaka Electro-Communication University

• Miyazaki Akira

  Osaka Electro-communication University

• Chang NionSock

  Osaka Electro-Communication University

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• A Study on Site Diversity Techniques Related to Rain Area Motion Using Ku-Band Satellite Signals
• Rain Depolarization Characteristics Related to Rainfall Types on Ka-Band Satellite-to-Ground Path (Special Issue on 1992 International Symposium on Antennas and Propagation)

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