Development of 1244 Mbps High-speed Network for WINDS Bent-pipe-relay Mode
- Paper number
IAC-07-B2.6.05
- Author
Mr. Yukio Hashimoto, National Institute of Information and Communications Technology (NICT), Japan
- Coauthor
- Coauthor
Mr. Takashi Takahashi, National Institute of Information and Communications Technology, Japan
- Coauthor
Ms. Naoko Yoshimura, National Institute of Information and Communications Technology, Japan
- Year
2007
- Abstract
The National Institute of Information and Communications Technology (NICT) and the Japan Aerospace Exploration Agency (JAXA) are developing the Wideband InterNetworking engineering test and Demonstration Satellite (WINDS). WINDS has two communication mode of a regenerative mode using an onboard switch and a bent pipe relay mode using wideband transponders of 1100 MHz bandwidth. And it has 19 fixed spot beams by two dishes of the multi-beam antenna and two scanning spot beams by the active phased array antenna. Receiving and transmitting beams can be switched by the on-board IF switch matrix at each time slot of the TDMA signals. Therefore, a satellite switching TDMA system can be constituted using WINDS.
We are developing the earth station and the SS-TDMA terminal for a high-speed network using the WINDS bent-pipe-relay mode. We developed the earth station installed in a vehicle with 2.4-m-diameter antenna. It can be used for communication of the data rate of 622 Mbps. We are developing fixed earth station with 5-m-diameter antennas at the NICT Kashima Space Research Center. It can be used for communication of the data rate of 1244 Mbps. We have a plan to develop other fixed earth stations.
The SS-TDMA terminal is consisted by a 622 Mbps/1244 Mbps dual data rate high speed burst modem and a burst controller/data interface. The 622 Mbps/1244 Mbps dual data rate high-speed burst modem is developed. A turbo process code (120, 128) 2 is used for forward error correction. It created a coding gain of 9.0 dB with the BER of 10 −10 in simulation and minimized the traffic with a coding rate of 0.879. The burst controller and the data interface is also developed, and is now assembled with the burst modem. The data interface communicates with a router by four paths of the gigabit Ethernet.
The over-all test using the 622 Mbps plot type burst modem and the earth station with the WINDS flight model was held last year. Degradation of BER with error correction is about 1 dB from IF loop back test. Degradation using the upper band of the transponder is larger than using the lower band, without error correction. This degradation is caused by the on-board BPF, therefore it will be improved by an equalizer.
The over-all test of 1244 Mbps high speed network will be held in this summer.
This paper describes the 1244 Mbps high-speed network for WINDS bent pipe relay mode and results of over-all tests.- Abstract document
- Manuscript document
IAC-07-B2.6.05.pdf (🔒 authorized access only).
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