Rain attenuation – The attenuation of the signal due rain is the most remarkable propagation effect of the signal in the Ku – band frequency, this kind of lost occur due to the previous thing, can be greater than 15 dB for a small amount of time. Gaseous absorption – The loss of approximately 1dB happens due to the steam absorption of, RAIN ATTENUATION USING Ka AND Ku BAND FREQUENCY BEACONS 47 corresponding ITU-R model6. The 0.01% of the rain rate exceedence value, required for the purpose is derived from the rain measurement done with a collocated tipping bucket rain gauge installed at the site. From the rain rate time series measurement data, At Ku band (1018 GHz), the – attenuation is less than 1 dB in clear weather or environment [12]. But when in raining weather, the – attenuations can high up to 10 dB. The higher rain rate, the attenuation correspondingly worse will be. Therefore, the Ku band is mumore susceptiblech to rain fade than C band [3-5]. Therefore, real-time data of rainfall are needed and required to evaluate the attenuation due to rain .
These studies are important for predicting the fade margin of a satellite link and optimize fade mitigation techniques, such as adaptive coding or modulation, data rate switching and power control.In the present paper, some results of rain attenuation measurements of Ku – band signal received from a satellite obtained at Kolkata, India, are presented along with the measurements of rain rates and rain drop.
RAIN EFFECT ON KU-BAND SATELLITE SYSTEM, RAIN EFFECT ON KU-BAND SATELLITE SYSTEM, RAIN EFFECT ON KU-BAND SATELLITE SYSTEM, Measurements of rain attenuation over an earth-space path at Kolkata (22°34′ N, 88°29′ E), India, have been carried out since June 2004 by receiving a Ku – band signal from the satellite NSS-6 …
