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  • Development of High-speed Network for WINDS

    Paper number



    Mr. Yukio Hashimoto, National Institute of Information and Communications Technology (NICT), Japan


    Mr. Naoko Yoshimura, National Institute of Information and Communications Technology (NICT), Japan


    Dr. Ryutaro Suzuki, National Institute of Information and Communications Technology, Japan




    The National Institute of Information and Communications Technology (NICT) and the Japan Aerospace Exploration Agency (JAXA) are developing the Wideband InterNetworking engineering test and Demonstration Satellite (WINDS). WINDS has three paths through a regenerative switch and six paths of a wideband bent pipe, and it has multi-beam antennas (MBA) with 19 fixed spot beams and an active phased array antenna (APAA) with two scanning spot beams. These paths are conected with beams by the on-board IF switch matrix (IFS) at each time slot of the TDMA signals.

    We are developing a high-speed network using the WINDS bent-pipe-relay mode. The transponders used for WINDS have a bandwidth of 1100 MHz. The earth station requires a 2.4-m-diameter antenna for a 622 Mbps high speed network and a 5-m-diameter antenna for a 1244 Mbps high speed network.

    We developed RF units with 2.4-m-diameter antennas for the earth station, which will be installed in a vehicle. We plan to develop fixed earth stations with 5-m-diameter antennas at the NICT Kashima Space Research Center and other places.

    Synchronization of the on-board IFS and the high-speed burst modem is maintained by a 155 Mbps reference burst, which is generated by JAXA’s standard station. This reference burst is the same as the one used for the regenerative switch except for the reference burst information. NICT is planning this high-speed network over 155 Mbps, but this reference burst can also be used by other systems during the same period of experiments. The Kashima Earth Station receives the 155 Mbps reference burst and generates a 622 Mbps reference burst that is synchronized with the 155 Mbps reference burst. Other stations in the high-speed network receive only a 622-Mbps reference burst for synchronization with the IFS of WINDS.

    A 622 Mbps high-speed burst modem was developed for the terminals of the high-speed network. A turbo process code (120, 128) 2 was used for error correction. It created a coding gain of 9.0 dB with a BER of 10 1 0 and minimized the traffic with a coding rate of 0.879. We developed a communication controller for the TDMA protocol and improved the data rate of the burst modem to 1244 Mbps.

    This paper describes the high-speed network for WINDS and the characteristics of the earth station and the burst modem.

    Abstract document


    Manuscript document

    IAC-06-B3.5.01.pdf (🔒 authorized access only).

    To get the manuscript, please contact IAF Secretariat.