1. BITTT and CCSDS in China
October 2010

2. About BITTT
BITTT is the abbreviation for Beijing Institute of Tracking and Telecommunications Technology.

3. About BITTT
Position
BITTT is the only direct subordinate institute of China Launch and Tracking Control General (CLTC).
BITTT is not only a core department in CLTC, but also the only dedicated institute for TTC general design and application in China.

4. About BITTT
Major work
BITTT is engaged in TTC network design, mission analysis, research and application of new TTC technology .

5. About BITTT Achievement
performed general technical scheme and interface design to provide TTC service for all space missions in China, such as Shenzhou manned space mission, ChangE lunar explorer mission.
accomplished planning and design of TTC network ,including launch center, mission operation center, S-band TTC network, and so on.

6. CCSDS in China Current Status S-band TTC network
has been compatible with CCSDS in RF and modulation
convolutional coding and R-S coding has been provided as options for downlink.

7. CCSDS in China Current Status Satellite data communications system
Convolutional coding , and R-S coding has been provided as options for return link.
TC space link protocol and TC synchronization and channel coding has been provided as options for forward link
AOS space link protocol has been provided as option for both forward link and return link

8. CCSDS in China Current Status ChangE-1 and ChangE-2 mission
convolutional coding has been implemented in TTC downlink .
R-S coding has been implemented in data transfer downlink.
CCSDS space packet protocol and AOS space link protocol has been implemented in data transfer downlink.
BACC and ESOC has realized cross support by SLE CLTU and SLE RAF.
Resource mission
AOS space link protocol has been implemented in data transfer downlink.

9. CCSDS in China In Future
As to deep space stations, which is being constructed:
will be compatible with CCSDS in RF and modulation.
convolutional coding and R-S coding will be provided as options for downlink.
AOS space link protocol will be provided as option for downlink.
SLE may be provided as optional interface to mission operation centre or payload operation centre.

10. CCSDS in China In Future
As to ChanE-3 mission, in addition to what has been implemented in ChangE-1 and ChangE-2,
concatenated coding will be implemented in data transfer downlink.
DOR measurement will be made, and once applicable, CCSDS Recommendation for Delta-DOR will be adopted .

11. CCSDS in China In Future Manned space mission
concatenated coding or individual convolutional coding will be implemented in forward and return links.
AOS space link protocol will be implemented.

12. CCSDS in China In Future As to research area
Research on space network which is suitable for future space missions of China is being made.
CCSDS recommendations are important candidate protocols.
A testbed is being constructed to evaluate the performance of candidate protocols.

13. THE END