【4. Operation of satellite by a ham radio operator】
The ham radio missions are missions performed for the improvement in the ham radio technical of Nihon University to accumulate, after finishing engineering missions. We are going to exhibit the ground station software which is possible to uplink by a ham radio operators, and it is considered that we would like you to use as one of the places of the improvement in the radio technology. We would like to train our radio communications technology by carrying out technical exchange with the ham radio operator through this line. Specifically, we would like to perform the following five missions.
Digitalker is the function which repeats voice mail messages from the satellite and transmits on the ground. In the SPROUT, the sound recorded on the ground beforehand is recorded on the IC called "Digitalker". And the recorded sound is transmitted from on an orbit to the ham radio station on the ground using FM transmitter. We think that it will carry out for making it the contents in accordance with the radio law.
The SSTV is the function which transmits a still picture in color on the ground from a satellite using The SSTV (Slow Scan TeleVision). In the SPROUT, the picture that is mounted beforehand is changed into a SSTV signal, and it transmits to the ham radio station on the ground using FM transmitter. The send mode is set the picture size per sheet to 320 pixel × 256 pixel by Scotti1.
- 3.Voice message box (recording + playback)
The voice message box is the function to relay the data under voice transmitted from the ham radio station on the ground. When voice data is uplinked to the SPROUT, the SPROUT saves the uplinked voice data at the digitalker. And the voice data that is saved is transmitted by using FM transmitter in the SPROUT to the ham radio station on the ground.
- 4.Text message box (text transmitting + text output)
The message box is the function to relay the text data transmitted from the ham radio station on the ground. When the text data that is uplinked to the SPROUT, the SPROUT saves the uplinked text data. And, the text data that is saved is transmitted with FM packet (1200 bps) to the ham radio station on the ground . Now, the number of characters which can transmit is planning a maximum of 44 characters.
- 5.Earth mapping project
The project which will make the earth takes the photo of the earth using the camera that is carried in the SPROUT, and it classifies for the place of every photo, and enables it to watch on this homepage. In this homepage, we would like to also put the photograph taken and contributed not only on the photos of the earth in Nihon University but on ham radio operators. Please contribute "the photograph which carried out the downlink", and "the uplinked command" to the specially set-up page of the project. We specify the orbital coordinates which took a photo in Nihon University, and put on the homepage. Presently, we consider the following four patterns about the photography method of the earth.
In the case of taking photo of the earth, we can choose the following four modes. Every mode takes a maximum of six photos, and performs the downlink of the picture by the SSTV.
- Time specification photography mode (engineering missions camera and outreach missions camera)
A shutter is pushed with the signal from a data-processing system.
- ADC shutter mode (outreach missions camera)
A shutter will be pushed if it judges that the camera turned to the direction of the earth from the solar sensor data of the ADC.
- Attitude determination photography mode (outreach missions camera)
Attitude determination is performed from the sun sensors, magnetic sensor, and gyro sensors data of the ADC and a shutter will be pushed if it judges that the camera turned to the direction of the earth.
- Attitude control photography mode (outreach missions camera)
The SPROUT is controlled by the magnetic torquers of the ADC, and a shutter will be pushed if it judges that the camera turned to the direction of the earth.