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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.)

On the effects of each term of the geopotential perturbation along the time I: Quasi-circular orbits

Texto completo
Autor(es):
Sanchez, Diogo M. [1] ; Prado, Antonio F. B. A. [1] ; Yokoyama, Tadashi [2]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Natl Inst Space Res, Div Space Mech & Control, BR-12227010 Sao Jose Dos Campos, SP - Brazil
[2] State Univ Sao Paulo, Dept Stat Appl Math & Comp, BR-13506900 Rio Claro, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Advances in Space Research; v. 54, n. 6, p. 1008-1018, SEP 15 2014.
Citações Web of Science: 19
Resumo

This paper provides a useful new method to determine minimum and maximum range of values for the degree and order of the geopotential coefficients required for simulations of orbits of satellites around the Earth. The method consists in a time integration of the perturbing acceleration coming from each harmonic of the geopotential during a time interval T. More precisely, this integral represents the total velocity contribution of a specific harmonic during the period T. Therefore, for a pre-fixed minimum contribution, for instance 1 x 10(-8) m/s during the period of time T, any harmonic whose contribution is below this value can, safely, be neglected. This fact includes some constraints in the degree and order of the terms which are present in the geopotential formula, saving computational efforts compared to the integration of the full model. The advantage of this method is the consideration of other perturbations in the dynamics (we consider the perturbations of the Sun, the Moon, and the direct solar radiation pressure with eclipses), since these forces affect the value of the perturbation of the geopotential, because these perturbations depend on the trajectory of the spacecraft, that is dependent on the dynamical model used. In this paper, we work with quasi-circular orbits and we present several simulations showing the bounds for the maximum degree and order (M) that should be used in the geopotential for different situations, e. g., for a satellite near 500 km of altitude (like the GRACE satellites at the beginning of their mission) we found 35 <= M <= 198 for T = 1 day. We analyzed the individual contribution of the second order harmonic (J(2)) and we use its behavior as a parameter to determine the lower limit of the number of terms of the geopotential model. In order to test the accuracy of our truncated model, we calculate the mean squared error between this truncated model and the ``full{''} model, using the CBERS (China-Brazil Earth Resources Satellite) satellite in this test. (C) 2014 COSPAR. Published by Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 11/08171-3 - Dinâmica orbital de pequenos corpos
Beneficiário:Othon Cabo Winter
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 11/09310-7 - Estudo orbital do movimento de veículos espaciais
Beneficiário:Antônio Fernando Bertachini de Almeida Prado
Linha de fomento: Auxílio à Pesquisa - Regular