Publications Journal article · Delay-tolerant networks · 2016

GLOrbit: A 3D Satellite Orbit Propagator for Network Topology Analysis

Juan A. Fraire, Pablo A. Ferreyra, and Raoul Velazco

Revista de la Facultad de Ciencias Exactas, Físicas y Naturales (UNC), vol. 3, no. 2, pp. 29–35, 2016

Abstract

Los protocolos de redes tradicionales fueron desarrollados para redes terrestres, caracterizadas por topologías altamente estáticas. En este escenario, los errores de enlace aleatorios han sido el cambio más demandante que una configuración de red podía enfrentar. Por otro lado, los protocolos de redes móviles se ocupan de topologías dinámicas pero asumen trayectorias desconocidas y muy alta conectividad. Ninguna de ambas se aplica al paradigma para las redes de constelaciones satelitales donde su naturaleza orbital describe topologías temporalmente variables pero altamente predecibles. Para estudiar este tipo de redes tolerantes a demoras, proponemos GLOrbit; una herramienta de análisis de topologías y redes de satélites, capaz de propagar nodos espaciales en el tiempo, en un ambiente visual 3D mientras registra la topología en diferentes formatos para estudios analíticos posteriores. Para esto implementamos el algoritmo de propagación SGP4, evaluadores de enlace entre nodos, y un motor gráfico de OpenGL. Esto permite obtener salidas precisas para graficar la red satelital y el análisis físico mientras se va ganando intuición visual para diferentes configuraciones orbitales. Se demuestran las capacidades de la herramienta con un primer trabajo de análisis con GLOrbit de tres topologías de orbitas bajas representativas. Escenarios lineales, transversales y diferentes escenarios de altitud son estudiados concluyendo que los lineales poseen una gran fortaleza en los enlaces inter-satelitales, mientras que los segundos en los contactos tierra-espacio. Finalmente, pero no por ello menos importante, debido a que los gráficos tradicionales representan redes estáticas, una novedosa estructura gráfica para topologías evolutivas temporalmente, es presentada como un resultado para el diseño topológico de redes tolerantes a demoras predecibles y sus estrategias de asignación de enlaces.

Cite

BibTeX

@article{fraire2016glorbit,
  author  = {Fraire, Juan A. and Ferreyra, Pablo A. and Velazco, Raoul},
  title   = {{GLOrbit}: A {3D} Satellite Orbit Propagator for Network Topology Analysis},
  journal = {Revista de la Facultad de Ciencias Exactas, F{\'i}sicas y Naturales (UNC)},
  volume  = {3},
  number  = {2},
  pages   = {29--35},
  year    = {2016},
  url     = {https://revistas.unc.edu.ar/index.php/FCEFyN/article/view/13881}
}

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