TUBSAT stands for Technical University of Berlin Satellite program. A total of six satellites are in polar orbit. The DLR-TUBSAT satellite carry 3 cameras in the visible wavelength range (See figure 1). The satellite is gyro stabilized and is able to track objects of interest on the ground. The altitude is 700 km and the speed is 25 Mack. With the 1m Telescope the DLR-TUBSAT can obtain 6 m spatial resolution, and it is able to track of an target object for about 2 minutes. The satellite is commanded by using a regular VHF/UHF antenna on ground level. The images are down loaded through the S-band at 2.208 GHz with a bandwidth of 8 MHz. The power of the S-band Transmitter is 5 Watts.
The DLR-TUBSAT frequencies are:
UHF 436,075 MHz 12-50 kHZ bandwidth
VHF 143,075 MHz “
S-Band 2,208 GHz w/ 8 MHz bandwidth; 5 Watt; 70 deg. field of view.
2 25757 98.3946 281.3415 0016333 65.5053 294.7842 14.49931933110409
The data from the S-band transmitter is received by the Svaltrack antenna, and a Satreciever converts the data to regular TV format. The images are then saved by a regular video recorder. The signal is BPSK, S-Band signal with veterbi coded data in ESA standard.
RF-Frequncy: 2208 MHz
IF- Bandwidth: 1,5 MHz
Video Bandwidth: 0,75 MHz
Demodulator Type: BPSK
Bitrate: 500 kbps
Soft or Hard
Pattern (SyncWord): 1A CF FC 1D
Frame Length: 32 bit
WordLength: 8 bit
FrameLenght 1042 words