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Spencer David B. Hogge Charles B. Campbell W. Spencer Sorge Marlon E. Mcwaters S. Rex 《Space Debris》2000,2(3):137-160
Congressional language in the 1998 US Senate Armed Services Committee authorization bill directed ... the Secretary of the (United States) Air Force to undertake a design study of a system that could catalog and track debris down to one centimeter in size out to 1000kilometer in altitude. The US Air Force Research Laboratory, in conjunction with other US National Laboratories and the National Aeronautics and Space Administration (NASA) conducted a study that examined what technical systems and operations would be required to perform such a mission. This paper outlines the study process, details the findings, draws conclusions, and makes recommendations as to what would be needed to develop an optically based system capable of cataloging and tracking small debris in low Earth orbit. 相似文献
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Serge Habraken Jean-Marc Defise Jean-Paul Collette Pierre Rochus Pierre-Alexis D'Odemont Michel Hogge 《Acta Astronautica》2001,48(5-12)
This paper presents some research activities conducted at the Centre Spatial de Liege (CSL) in the field of space solar arrays and concentration.With the new generation of high efficiency solar cells, solar concentration brings new insights for future high power spacecrafts. A trade-off study is presented in this paper. Two different trough concentrators, and a linear Fresnel lens concentrator are compared to rigid arrays. Thermal and optical behaviors are included in the analysis.Several technical aspects are discussed:
- • Off-pointing with concentrators induces collection loss and illumination non uniformity, reducing the PV efficiency.
- • Concentrator deployment increases the mission risk.
- • Reflective trough concentrators are attractive and already proven. Coating is made of VDA (Aluminum). A comprehensive analysis of PV conversion increase with protected silver is presented.
- • Solar concentration increases the heat load on solar cells, while the conversion efficiency is significantly decreasing at warm temperatures.
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