For satellite to ground laser links, atmospheric turbulence is a major cause of impairments. The induced phase perturbations along the propagation path cause beam scintillation in the receiver plane and they can also severely compromise the coupling of the flux into a receiver of limited size. To address these impairments, dedicated mitigation strategies must be developed. This requires accurate understanding of the perturbation origin. Beam propagation models have demonstrated their ability to reproduce statistical characteristics of optical perturbations on a satellite to ground laser link for elevations as low as 20°. For smaller elevations, measurements performed on stars illustrated the limits of analytical approaches and the interest for end-to-end models. We report here the first propagation channel measurements performed on a LEO microsatellite with a Shack-Hartmann wavefront sensor (WFS). The laser beam at 976 nm provided by SOTA optical terminal have been analyzed with a Shack- Hartmann wavefront sensor located at Coudé focus of the French ground station (1,55 m MéO telescope) in July 2015. Wavefront characteristics and scintillation patterns recorded with the WFS are analyzed and compared to atmospheric turbulence perturbations model fed with in situ measurements of atmospheric parameters retrieved from GDIMM.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    First results of wavefront sensing on SOTA


    Contributors:


    Publication date :

    2015-10-01


    Size :

    3335211 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Adaptive optics results with SOTA

    Petit, C. / Vedrenne, N. / Michau, V. et al. | IEEE | 2015


    Söta tåg på undersidan

    Karlsson, Lars Olov | IuD Bahn | 2003


    FOTA/SOTA-Management

    WindRiver,US | Automotive engineering | 2016


    SOTA: Small Optical Transponder for micro-satellite

    Koyama, Y / Toyoshima, M / Takayama, Y et al. | IEEE | 2011