Transmissão digital em HF

• Autor(a) principal: Araujo, Valdileide Freire de
• Data de Publicação: 2008
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal Fluminense (RIUFF)
• Texto Completo: https://app.uff.br/riuff/handle/1/17275
• topic: Ionosfera; Transmissão Digital; HF; Engenharia de telecomunicações; Ionosphere; Digital Transmission; HF; CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA::TELECOMUNICACOES

The purpose of this work is to enrich knowledge about ionosphere propagation, through field made measurements, in order to improve usual link procedures. It presents the ionosphere formation . the HF wave propagation region . as well as wave propagation in the ionosphere, HF system performance prediction (based on UIT-R P.533-8 Recommendation) and field made measurements. The HF propagation predictions, available in UIT-R P.533-8 Recommendation, are compared to measurements results and the collected data analyses are showed. The work indicates that HF system equipments are flexible and adjustable themselves in accordance to ionospheric status, in order to achieve strengthen communications. HF communications viability with excellent quality of voice and data transmission is proved in HF channel, which presents itself as a reliable and profitable medium for long distance links.