Abstract
Terrestrial solar power is severely limited by the diurnal day–night cycle. To overcome these limitations, a Solar Power Satellite (SPS) system, consisting of a space mirror and a microwave energy generator-transmitter in formation, is presented. The microwave transmitting satellite (MTS) is placed on a planar orbit about a geostationary point (GEO point) in the Earth’s equatorial plane, and the space mirror uses the solar pressure to achieve orbits about GEO point, separated from the planar orbit, and reflecting the sunlight to the MTS, which will transmit energy to an Earth-receiving antenna. Previous studies have shown the existence of a family of displaced periodic orbits above or below the Earth’s equatorial plane. In these studies, the sun-line direction is assumed to be in the Earth’s equatorial plane (equinoxes), and at \(23.5^{\circ }\) below or above the Earth’s equatorial plane (solstices), i.e. depending on the season, the sun-line moves in the Earth’s equatorial plane and above or below the Earth’s equatorial plane. In this work, the position of the Sun is approximated by a rectangular equatorial coordinates, assuming a mean inclination of Earth’s equator with respect to the ecliptic equal to \(23.5^{\circ }\). It is shown that a linear approximation of the motion about the GEO point yields bounded orbits for the SPS system in the Earth–satellite two-body problem, taking into account the effects of solar radiation pressure. The space mirror orientation satisfies the law of reflection to redirect the sunlight to the MTS. Additionally, a MTS on a common geostationary orbit (GEO) has been also considered to reduce the relative distance in the formation flying Solar Power Satellite (FF-SPS).
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Acknowledgements
First, authors thank the financial support of the FAPESP (São Paulo Research Foundation, Brazil), Grants 2011/08171-3, 2013/03233-6 and the CNPq (National Council for Scientific and Technological Development, Brazil), and the technical support of University of Glasgow. C.R.M. was support by an Engineering and Physics Research Council (EPSRC) Institutional Sponsorship Grant and a Royal Society Wolfson Research Merit Award.
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Communicated by Elbert Macau, Antônio Fernando Bertachini de Almeida Prado and Othon Cabo Winter.
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Salazar, F.J.T., Winter, O.C. & McInnes, C.R. Collecting solar power by formation flying systems around a geostationary point. Comp. Appl. Math. 37 (Suppl 1), 84–95 (2018). https://doi.org/10.1007/s40314-017-0473-6
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DOI: https://doi.org/10.1007/s40314-017-0473-6
Keywords
- Solar Power Satellite system
- Formation flying
- Microwave transmitting satellite
- Geostationary point
- Two-body problem
- Solar radiation pressure