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  • Technology Demonstration on University of Tokyo’s Pico-Satellite “XI-V” and Its Effective Operation Result using Ground Station Network

    Paper number



    Dr. Ryu Funase, Japan Aerospace Exploration Agency (JAXA), Japan


    Mr. Yuliang Cheng, University of Tokyo, Japan


    Mr. Takashi Eishima, University of Tokyo, Japan


    Mr. Akito Enokuchi, University of Tokyo, Japan


    Mr. Masaki Nagai, University of Tokyo, Japan


    Mr. Kenji Nakada, University of Tokyo, Japan


    Dr. Yuya Nakamura, University of Tokyo, Japan


    Prof. Shinichi Nakasuka, University of Tokyo, Japan


    Mr. Toshiyuki Takei, University of Tokyo, Japan




    (Because of the large number of co-authors, the auto-generated abstract exceeded 1page limitation. Please check not only this page but also the next page.)
    University of Tokyo ISSL (Intelligent Space Systems Laboratory) has been developing pico-satellites since 1999. Its first satellite was “Cubesat XI-IV” [sai-four], which weighs only 1kg and is 10cm cubical shape. The objective of XI-IV was the technology demonstration of the pico-satellite bus system within 1kg weight and the on-orbit use of COTS components. XI-IV was successfully launched from Plesetsk Cosmodrome, Russia in June 30th, 2003. Up to now it has been operating in very good condition as the world smallest satellite, and various on-orbit experiments including sensor data acquisition, attitude motion estimation and Earth imaging mission have been performed successfully. Following this successful accomplishment of XI-IV’s mission, ISSL developed another pico-satellite named “XI-V” [sai-five] in 2004 in order to demonstrate new space technologies. XI-V is scheduled to be launched on June 30th, 2005 by a Russian rocket “KOSMOS”.

    XI-V has three missions to be achieved. The primary mission is the demonstration of the CIGS type solar cells, which is developed by JAXA (Japan Aerospace Exploration Agency). It can be said that one of the most significant advantages of small satellite is such quick demonstration of new technologies in space. The second mission is the Earth image acquisition. The resolution of the acquired image is improved compared with XI-IV and the rapid shooting function is added to enable the attitude motion estimation using continuous images. The third mission is the service mission for the general public. XI-V has the function of transmitting the message over morse-coded CW signal, and the messages will be collected from all over the world and uplinked to the satellite. Other than the missions described above, the notable feature of XI-V is the improvement of the precision of the telemetry data. Although XI-IV had a problem with the telemetry precision, the precise evaluation of the sensor data is made possible in XI-V, which is essential for its primary mission (solar cell demonstration).

    In the operation of XI-V, the Ground Station Network will be utilized, which is being developed among universities in order to effectively receive the telemetry data from the satellite. For an amateur radio satellite such as XI-V, the effective operation is very important where many ground stations cooperatively receive signals from the satellite. This is because the amateur radio band is much crowed and is likely to suffer from illegal interferences.

    In the symposium, the details of XI-V and its missions and the results of its operation using Ground Station Network will be presented.

    Abstract document


    Manuscript document

    IAC-05-B5.3._B5.5.02.pdf (🔒 authorized access only).

    To get the manuscript, please contact IAF Secretariat.