Characterization of GSAT‐14 Satellite Ka‐Band Microwave Signal Attenuation Due to Precipitation Over a Tropical Coastal Station in the Southern Peninsular Region of the Indian Subcontinent

Abstract

This paper focuses on study of attenuation of microwave propagation at Ka‐band frequencies due to precipitation over an Indian Tropical station, Thiruvananthapuram (8.5°N, 76.8°E). The station is located on the gateway of S‐W Indian monsoon into the subcontinent characterized with prolonged rain for a period of about 9 months. A satellite link has been established at Thumba, Thiruvananthapuram, between Ka‐band receiver operating at 20.2 and 30.5 GHz and GSAT‐14 as part of Indian Space Research Organization's Ka‐band propagation experiment. The concurrent measurements of Ka‐band signals and the precipitation, using a collocated laser precipitation monitor instrument, were carried out during the entire period of Indian monsoon. The study focuses on quantifying the dependence of Ka‐band attenuation on rain rate during the rain‐dominated premonsoon and summer monsoon seasons. The observed attenuation has been evaluated with ITU model.

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