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20 Mbps from an aircra. is high-speed data communi-cation capability enables the system to perform required tasks in quick turnaround: acquiring Pi-SAR observation data, conversion to transmission format, and transmission to an earth station. e speed will be of great help to assist quick judgment and response at the time of a disaster.5Concluding remarksNICT has developed an AES system to be used in a Ka-band satellite communication system, and mounted the station on board a plane to conduct ight experiments. e objectives were broadly two-fold: verication of the an-tenna pattern extended by the Chubu beam of the WINDS MBA, and tracking characteristics of the antenna imple-mented in AES. In addition, measurements were made to evaluate data transmission characteristics and le transfer performance during a ight.e measurement results veried excellent agreement between the current antenna pattern and that obtained by initial check-out carried out aer the launch of WINDS. e results also proved that the antenna satised design specications and conrmed its capability to perform stable communication within the given tracking range. In-ight experiments conrmed that data transfer can be performed at the rate of 38 Mbps using UDP and 31 Mbps using TCP. Transfer of large-volume les in the air was successfully conducted at the rate of 20 Mbps.As described above, the experiment showed the capa-bility to establish communication between the air-borne earth station and a satellite system at the rate of several tens of Mbps using the Ka band, indicating the feasibility of its use for sharing information among disaster-stricken areas, as well as for in-ight entertainment applications.ReferenceR1Special Issue on Wideband InterNetworking engineering test and Demonstration Satellite (WINDS), Journal of the National Institute of Information and Communications Technology, vol.54, no.4, Dec. 2007.2Akira AKAISHI, Takashi TAKAHASHI, Mitsugu OHKAWA, Toshio ASAI, and Byeongpyo JEONG, “Ka-band Mobile Earth Station for WINDS,” 29th ISTS, June 20133Norihiko Katayama, Akira Akaishi, Hideki Honda, Takashi Takahashi, Kazuyoshi Kawasaki, Toshio Asai, Naoko Yoshimura, and Morio Toyoshima, “The Satellite Communication Experiment using The Earth Station on Board Vessel for WINDS at The Sea,” IEICE technical report, vol.116, no.144, SAT2016-31, pp.107–112, July 2016. (in Japanese)4 Norihiko Katayama, et al., “Development of Aeronautical Earth Station for WINDS,” 30th International Symposium on Space Technology and Science, 2015-j-10, 20155Takashi Takahashi, et al, “Development of Ka-band Aeronaurical Earth Station for WINDS,” 33rd AIAA Internatinal Communications Satellite Systems Conference, AIAA 2015-4322, 2015.6Tomoshige Kan, et al, “Measurement of Propagation Characteristics for Ka-Band Aeronautical Satellite Communications Using WIND,” 34rd AIAA Internatinal Communications Satellite Systems Conference, AIAA 2016-5759, 2016. 7DIAMOND AIR SERVICE, “Aircraft,” http://www.das.co.jp/en/service/aircrafts-pec/index.html8Akitsugu Nadai, Seiho Uratsuka, Toshihiko Umehara, Tatsuharu Kobayashi, Takeshi Matsuoka, and Makoto Satake, “Development of X-band Airborne Synthetic Aperture Radar with Sub-Meter Spatial Resolution,” IEICE technical report, vol.109, no.13, SANE2009-7, pp.37–42, April 2009. (in Japanese)9https://iperf.fr/Tomoshige KAN, Dr. Eng.Researcher, Space Communications Laboratory, Wireless Networks Research CenterSatellite communication propagationNorihiko KATAYAMA, Dr. Eng.Researcher, Space Communications Laboratory, Wireless Networks Research CenterSatellite communications, Propagation, NetworkTakashi TAKAHASHI Associate Director, Space Communications Laboratory, Wireless Networks Research CenterSatellite communication3 Ultra-High-Speed Satellite Communication Technology144　　　Journal of the National Institute of Information and Communications Technology Vol. 64 No. 2 (2017)