Computer Science
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010spie.7685e..11t&link_type=abstract
Atmospheric Propagation VII. Edited by Wasiczko Thomas, Linda M.; Spillar, Earl J. Proceedings of the SPIE, Volume 7685, pp.
Computer Science
Scientific paper
Experiments involving laser communications between an optical ground station and a low earth orbit (LEO) satellite were successfully conducted from 2006 to 2009. The optical ground station is located in Koganei, Tokyo, and was developed by the National Institute of Information and Communications Technology (NICT), Japan. Four laser beams were transmitted from the optical ground station to the LEO satellite in order to reduce the intensity of the fluctuation of the optical signal caused by atmospheric turbulence. The frequency characteristics of the downlink are evaluated on the basis of theory and the measurements, where the sampling rate was 20 kHz. The speckle patterns were averaged and the frequency response of the received optical signal was filtered by the telescope aperture. The basis of the temporal aperture filtering function is derived and compared with the measured results.
Shoji Yozo
Takayama Yoshihisa
Takenaka Hideki
Toyoshima Morio
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