Development of University Nano Satellite and Its On-orbit Demonstration by International Collaboration

由东京大学和东京工业大学的学生研制的名为“CubeSat-XI”和“CUTE-1”的纳米卫星，体积为10厘米，重量为1公斤，完成了最后的检查，并完成了空间预警登记，卫星和地面站的频率获取和许可。这两颗卫星被运送到俄罗斯的普列谢茨克航天发射场，由学生们亲手安装在三级摇臂“rocot”上。2003年6月30日23时15分（日本时间）成功发射，7月1日0时48分将两颗卫星送入824公里高度的太阳同步轨道。在与火箭分离后，它们正常运行，在它们在日本的第一个路径上，东京大学和东京工业大学的空间站获得了第一个信标信号。此后，两颗卫星运行正常，进行了预先计划的各种在轨实验，包括部署、通信、图像采集和下行、姿态运动估计实验。这些成就证明了该大学在空间开发领域的能力。此外，利用COTS技术实现了低成本、快速开发的总线系统，为卫星发展的新途径提供了有价值的见解。国际谈判和各种程序的经验，以及与业余无线电工程师合作的地面操作，也是重要的成果，将为以下大学提供有用的资料。

Nano satellite named "CubeSat-XI" and "CUTE-1" developed by the students of the University of Tokyo and Tokyo Institute of Technology, which is 10 cm cubic satellite with 1 kg, were completed and made final check-out, and their registration in Space Warn, frequency acquisition and licensing of the satellite and ground stations were completed. The two satellites were transported to Plesetsk Cosmodrome in Russia for installation onto the 3-stage rocker "ROCKOT" by the students' hands.ROCKOT was launched on June 30,2003 at 23:15 (Japan Time) successfully and the two satellites were inserted into the sun-synchronous orbit of 824 km altitude at 0:48 of July 1st. They were operating normally after separation from the rocket, and on their first path on Japan, the first beacon signals were acquired at University of Tokyo's and Tokyo Institute of Technology's station. Since then, the two satellites have been operating quite normally, performing various on-orbit experiment planned beforehand including deployment, communication, image acquisition and downlink, attitude motion estimation experiments.These achievement proved the university's capability in the field of space development. Besides, low cost and quickly developed bus system utilizing COTS was demonstrated in space, which provides valuable insight into the new way of satellite development. Experience of international negotiation and various procedures, and ground operation in collaboration with amateur radio engineers were also important fruits, which will provide useful information to the following universities.