Results of radiometric studies at 19.9 GHz at Amritsar (India)

The paper presents the results of 19.9 GHz radiometric propagation studies conducted over a period of one year at Amritsar, for determining rain induced zenith path attenuation. The zenith path attenuation has been determined by the measurements of sky noise temperature received by the radiometer. The results obtained from the experiment are presented in the form of annual cumulative distributions of rain rate, sky noise temperature, and zenith path attenuation together with worst-month statistics. The rainfall rate cumulative distribution as predicted from CCIR rain climate zone ´E´ is much lower than the actually measured rainfall rate cumulative distribution. The cumulative distribution of zenith path attenuation predicted by using the CCIR model (by taking the value of rain rate exceeded for 0.01% of time for rain zone climate ´E´) is in very good agreement with the measured cumulative distribution of zenith path attenuation for higher percentage of time and not in so good agreement for lower percentage of time.