RESEARCH ON POSSIBLE SCIENTIFIC AND ENGINEERING EDUCATION BY DEVELOPING EDUCATIONAL SATELLITE MISSION

这项研究的目的是调查、提出、实验和评估利用一颗名为SOHL-1的实验卫星进行科学和工程教育的可能性。SOHLA-1是由东大阪空间发展合作社Astro-Technology SOHL设计和建造的。我们与SOHL合作开发了一种教育任务设备，这是标准的业余无线电数字通信系统。其中一个主要部件是斧头。25协议分组无线控制器称为TNC。研制的TNC能够以1200波特的速率发送状态遥测和文本消息。SOHL A-1已经正式注册在JAXA H 2A火箭搭载的卫星上，计划于2008年8月发射。我们开发了一个无调制解调器的TNC来接收由SOHL A-1发送的分组数据。我们使用PIC/PSoC微控制器设计了TNC，不仅可以对AX进行编/解码。25 UI帧数据，还可对AFSK信号进行调制/解调。这种类型的TNC除了易于组装外，还具有结构简单、成本低廉的优点。无调制解调器TNC作为教育工具包提供给每一位试图参与该教育项目的教师和学生。为了解码SOHL A-1状态遥测，我们利用Microsoft Visual Studio 2005 C#开发了一个软件。由于该软件具有Windows标准图形用户界面，因此对任何学生来说都很容易使用。利用CubeSat/XI-V对译码能力进行了验证。

The purpose of this research is to investigate, propose, experiment and evaluate a possible scientific and engineering education utilizing an experimental satellite named SOHLA-1. SOHLA-1 has been designed and constructed by Higashi-Osaka Space Development Cooperative named Astro-Technology SOHLA. We collaborated with SOHLA to develop an educational mission equipment, which is the standard amateur radio digital communication system. One of the main component is the AX. 25 protocol packet radio controller called TNC. The developed TNC is capable of sending status telemetry and text message at the rate of 1200 baud. SOHLA-1 has been formally registered with a piggy-back satellite of JAXA H2A rocket, which is scheduled to be launched in August 2008.We developed a modem-less TNC to receive packet data sent by SOHLA-1. We designed the TNC by using PIC/PSoC micro controllers not only to encode/decode AX. 25 UI frame data but also modulate/demodulate AFSK signal. Advantages of this type of TNC are simple and inexpensive in addition to be easy to assemble it. The modem-less TNC is available as an educational kit for every teacher and student who are attempting to participate in the proposed educational project.To decode SOHLA-1 status telemetry, we developed a software by means of Microsoft Visual Studio 2005 C#. Since the software has the Windows standard graphical user interface, it is quite easy to use for any student. Decoding capability was successfully verified by using Cubesat/XI-V.