The Research And Simulation Of Network Protocol Of Integrated TT&C Net

With the astronautics technology development and the space mission operation internationalization, it is urgent to construct the Integrated TT&C Net. The Integrated TT&C Net is not only using in the field of civil astronautics, but also will be more and more used in military.Nowadays, the overseas astronautics telemetry and telecommand networking technology was already mature and the system equipment was perfect. While various countries' telemetry and telecommand system mostly used CCSDS (Consultative Committee for Space Data System) protocol to connect the network mutually and share the network resource. Compared with CCSDS standard, our spacecraft data system is under-utilization of channel and the transmission is complicated and the system also cannot use the data with the international general astronautics system each other. So we need to study the development of CCSDS standard. Moreover, the success of the using of TCP/IP for Space TT&C Net overseas speeds up the renovation of our Space TT&C Net. For the particularity of Space TT&C Net, there are some problems in the using of TCP/IP for Space TT&C Net. So, this paper does research on the using of TCP/IP for Space TT&C Net. This paper considered this two kind of protocols synthetically according to our country's current situation of TT&C Net, and research are mainly on the improvement of TCP/IP. CCSDS protocols are also introduced. At last , the network model is established in OPNET and simulation is finished.My work are listed as below:1 Research on the network architecture and network topology of Integrated TT&C Net.2 Deep research on the CCSDS protocols, emphasize on the AOS data link protocol.3 This paper analyzed the problems and solutions of using TCP/IP in the TT&C net and researched several common TCP algorithms. According to SACK algorithm that performs well, it has proposed a solving scheme based on basic serial number plus offset. And it could be used in satellite network.4 The network topology is established in OPNET, with the relatively standardized level node model to complete the throughput simulation and make verification of improved algorithm.