Even the longest geosatellite, at 40 m, subtends only 0.2 arcsec (1 microradian). Determining structure and orientation with 10 cm resolution requires a 90 m telescope at visual wavelengths, or an interferometer. We de- scribe the application of optical interferometry to observations of complex extended targets such as geosatellites, and discuss some of its challenges. We brie y describe our Navy Optical Interferometer (NOI) group's eorts toward interferometric observations of geosatellites, including the rst interferometric detection of a geosatellite. The NOI observes in 16 spectral channels (550{850 nm) using up to six 12-cm apertures, with baselines (separa- tions between apertures) of 16 to 79 m. We detected the geosatellite DirecTV-9S during glint seasons in March 2008 and March 2009, using a single 16 m baseline (resolution 1:6 m). Fringes on a longer baseline were too weak because the large-scale structure was over-resolved. The fringe strengths are consistent with a combination of two size scales, 1:3 m and & 3:5 m. Our near term NOI work is directed toward observing geosatellites with three or more 10 to 15 m baselines, using closure phase measurements to remove atmospheric turbulence eects and coherent data averaging to increase the SNR. Beyond the two- to three-year time frame, we plan to install larger apertures (1.4 and 1.8 m), allowing observations outside glint season, and to develop baseline bootstrap- ping, building long baselines from chains of short baselines, to avoid over-resolution while increasing maximum resolution. Our ultimate goal is to develop the design parameters for dedicated satellite imaging interferometry.


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    Titel :

    Interferometric imaging of geostationary satellites


    Beteiligte:
    Armstrong, J. T. (Autor:in) / Baines, E. K. (Autor:in) / Hindsley, R. B. (Autor:in) / Schmitt, H. R. (Autor:in) / Restaino, S. R. (Autor:in) / Jorgensen, A. M. (Autor:in) / Mozurkewich, D. (Autor:in)

    Kongress:

    Sensors and Systems for Space Applications V ; 2012 ; Baltimore,Maryland,United States


    Erschienen in:

    Erscheinungsdatum :

    07.05.2012





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Interferometric imaging of geostationary satellites [8385-11]

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    Interferometric Imaging of Geostationary Satellites: Signal-to-Noise Considerations

    Jorgensen, A. | British Library Conference Proceedings | 2011


    Simulated Synthesis Imaging of Geostationary Satellites

    Schmitt, H. | British Library Conference Proceedings | 2011


    Geostationary satellites collocation

    Li, Hengnian | TIBKAT | 2014


    Theory of geostationary satellites

    Zee, Chong-Hung | TIBKAT | 1989