Experimental results of Japanese CS program
Abstract
Japan's CS spacecraft is an experimental domestic communication satellite using frequencies of K-band (30 GHz/20 GHz) and C-band (6 GHz/4 GHz). The spacecraft was launched in December 1977 and various kinds of experiments are being performed. The paper presents the results of the experiments obtained during the first year of the mission period. Some techniques were tested in measuring the characteristics of the transponders on orbit. The telephone signals of 972 channels in FDM-FM transmission configuration can be transmitted through the transponder with some rain margin. In the PCM-PSK-TDMA signal transmission experiments, bit error rate characteristics were investigated with various parameters at the bit rate of up to 96 MB/s. Data on rain rate and attenuation due to rain at 20 GHz were accumulated. Relation of the attenuation between 30 GHz (uplink) and 20 GHz (downlink) were obtained. Experiments on orbit/attitude determination and dynamics analysis on nutation of the spacecraft were carried out.
- Publication:
-
Munich International Astronautical Federation Congress
- Pub Date:
- September 1979
- Bibcode:
- 1979muni.iafcT....H
- Keywords:
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- Domestic Satellite Communications Systems;
- Extremely High Frequencies;
- Japanese Space Program;
- Satellite Transmission;
- Microwave Transmission;
- Nutation;
- Performance Tests;
- Satellite Antennas;
- Transponders;
- Communications and Radar