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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Study of Some Strategies for Disposal of the GNSS Satellites

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Autor(es):
Sanchez, Diogo Merguizo [1] ; Yokoyama, Tadashi [2] ; Bertachini de Almeida Prado, Antonio Fernando [1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] INPE, BR-12227010 Sao Jose Dos Campos, SP - Brazil
[2] Univ Estadual Paulista UNESP, BR-13500970 Rio Claro, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: MATHEMATICAL PROBLEMS IN ENGINEERING; 2015.
Citações Web of Science: 4
Resumo

The complexity of the GNSS and the several types of satellites in the MEO region turns the creation of a definitive strategy to dispose the satellites of this system into a hard task. Each constellation of the system adopts its own disposal strategy; for example, in the American GPS, the disposal strategy consists in changing the altitude of the nonoperational satellites to 500 km above or below their nominal orbits. In this work, we propose simple but efficient techniques to discard satellites of the GNSS by exploiting Hohmann type maneuvers combined with the use of the 2(omega) over dot + (Omega) over dot approximate to 0 resonance to increase its orbital eccentricity, thus promoting atmospheric reentry. The results are shown in terms of the increment of velocity required to transfer the satellites to the new orbits. Some comparisons with direct disposal maneuvers (Hohmann type) are also presented. We use the exact equations of motion, considering the perturbations of the Sun, the Moon, and the solar radiation pressure. The geopotential model was considered up to order and degree eight. We showed the quantitative influence of the sun and the moon on the orbit of these satellites by using the method of the integral of the forces over the time. (AU)

Processo FAPESP: 12/21023-6 - Dinâmica de satélites artificiais
Beneficiário:Rodolpho Vilhena de Moraes
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 14/06688-7 - Dinâmica de satélites artificiais
Beneficiário:Antônio Fernando Bertachini de Almeida Prado
Linha de fomento: Auxílio à Pesquisa - Regular