Navy Prototype Optical Interferometer observations of geosynchronous satellites.
Navy Prototype Optical Interferometer observations of geosynchronous satellites.
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地球同步卫星的海军原型光学干涉仪观测。
DOI：
10.1364/ao.50.002692
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发表时间：
2011
期刊：
影响因子：
1.9
通讯作者：
S. Gregory
中科院分区：
文献类型：
--
作者：
R. Hindsley;J. Armstrong;H. Schmitt;J. Andrews;S. Restaino;C. Wilcox;F. Vrba;J. Benson;M. Divittorio;D. Hutter;P. Shankland;S. Gregory
利用海军原型光学干涉仪（NPOI）的15.9米基线，我们在2009年3月的两个晚上成功地探测到地球同步卫星（geosat） DirecTV-9S的闪烁观测中的干涉条纹。条纹能见度可以由两个分量组成的模型进行拟合，一个是已分辨的（约3.7 m），另一个是未分辨的（约1.1 m）。闪烁的长度和镜面反照率都与闪烁表面不是完全平坦的概念相一致，并且将反射的阳光散射成大约15°的开口角。对NPOI的增强将改善地球卫星的观测，包括增加红外能力，这可以延长闪烁季节，并增加更大的，自适应光学装备的望远镜。未来的工作可能会测试用掩孔大型望远镜观测地球卫星的可行性，以及开发一个由6到9个元素组成的阵列的可行性。
Using a 15.9 m baseline at the Navy Prototype Optical Interferometer (NPOI), we have successfully detected interferometric fringes in observations of the geosynchronous satellite (geosat) DirecTV-9S while it glinted on two nights in March 2009. The fringe visibilities can be fitted by a model consisting of two components, one resolved (≳3.7 m) and one unresolved (∼1.1 m). Both the length of the glint and the specular albedos are consistent with the notion that the glinting surfaces are not completely flat and scatter reflected sunlight into an opening angle of roughly 15°. Enhancements to the NPOI that would improve geosat observations include adding an infrared capability, which could extend the glint season, and adding larger, adaptive-optics equipped telescopes. Future work may test the feasibility of observing geosats with aperture-masked large telescopes and of developing an array of six to nine elements.