Sistema GPS: uma órbita em evolução - número de satélites e periodicidade

• Autor(a) principal: Brito, Gustavo Reis de [UNESP]
• Data de Publicação: 2014
• Outros Autores: Corrêa, Caroline dos Santos [UNESP], Bongiovanni, Solange [UNESP], Rodrigues, Ramon Juliano [UNESP]
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://energia.fca.unesp.br/index.php/energia/article/view/1019; http://hdl.handle.net/11449/126951
• topic: Sidereal time; Satellite monitoring; Satellite space segment; Hora sideral; Monitoramento de satélites; Segmento espacial

The objective of this project was to monitor the satellites of the Global Positioning System (GPS) from a fixed point on Earth and to verify the rate of recurrence respect to their rotation and displacement. A topographic GPS signal receiver connected to a personal computer was used to recorded, for five days, the displacement of the satellites. This work was based on the fact that many literature references state that satellites complete one orbit around the Earth every 12 hours, then, it is assumed that the satellite would be seen twice in a day from the same fixed point on Earth.Although, this does not occur, as thise time interval correspond to 12 hours sidereal time and not solar time. In addition, this study was carried out in order toconfirm and update the information related to the number of satellites in operation today, found to be 31. In that sense, some references concerning the space segment of this system were defined in details.