Tropospheric scintillation in the Ka and Q bands

• Autor(a) principal: Pinho, Ana de Resende Gomes de
• Data de Publicação: 2019
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10773/29640
• topic: Scintillation; Ka-band; Q-band; Fade; Enhancement

The growth of satellite communications and the demand for services with higher bandwidth and adequate quality of service requires higher frequencies and the research on the propagation channel has become a necessity. This dissertation intends to study an impairment phenomenon, named scintillation, that radio signals suffer crossing the earth’s atmosphere. The study is supported experimentally by a set o propagation data collected in Aveiro: one at the Ka-band and other at the Q-band. These experimental data have been collected from 2016 until now and the total volume of data is about 20 GB. The theory behind scintillation is presented, in order to understand its physical basis and the influence on the signals. Experimental measurements were conducted to collect the signals amplitude at 8 S/s and process them with the aim of extracting the final scintillation signal. This signal is the base of every analysis done in this dissertation. The measured scintillation parameters are compared with some well-known models from literature. Additionally, this work establishes a relation between scintillation behavior with meteorological parameters and their correlation in a short and long term basis. The fades and enhancements distributions of the scintillation were calculated. The fades distribution can negatively impact the CNR at the reception.