The Study On Architecture And Key Technologies Of The Military Satellite Constellation Communication Network Based On NEMO

To improve our army's levels of the Communication and Command equipments, and meet the future development requirements of the military satellite communication systems, we integrate the mobile network technology and the satellite constellation technology, and present the Network mobility based SATellite constellation communication system ("NSAT"), and make an in-depth study on the key technologies of the mobility management, routing optimization, and security issues in this dissertation. The main contributions of this dissertation are summarized as follows:Firstly, by analyzing the current status of the military satellite communication system, the trend that the military communications system will support the network mobility is indicated; the architecture of NSAT system with the mobile network's characteristics is presented; the general design requirements, the project of the NSAT's constellation design, the communication link design and the network design are presented; based on the design examples, the orbital characteristics and basic communications performance of NSAT system are verified upon the STK and NS2 platform. The simulation results show that the designed architecture can meet the continuous covering, viewing and connectivity needs, and support the low delay data transmitting.Secondly, by analyzing the mobility management in the terrestrial network, the mobility management rules of the NSAT system are presented; considering the mobility management characteristics of the NSAT system's terrestrial segment and user segment, the terrestrial segment and user segment mobility management schemes for the NSAT system are presented, and the relevant protocols and models are also designed. Simulation analysis shows that the two mobility management schemes can meet the needs of the NSAT system, and the terrestrial segment mobility management scheme can reduce 15% (n=10) on the network cost and 37.5% on the handoff delay than the mobility management scheme based on the home authentication, and the user segment mobility management scheme can reduce 2/3 on the handoff delay than the mobility management scheme based on the home authentication.Thirdly, by analyzing the routing optimization in the mobile network, the necessity to implement the routing optimization in the NSAT system is specified; according to the dynamic home agent based routing optimization scheme in the non-nested environment, the routing optimization scheme for the NSAT system is presented, and the relevant protocols and models are designed; a simulation on the presented routing optimization scheme is performed in the NSAT system environment. The simulation analysis shows that the presented routing optimization scheme in the nested environment can meet the application needs of NSAT, and can reduce 33.8% on the network delay than the RRH scheme, and have a better performance on protocol extension than the RRH scheme.Finally, by analyzing the basic concepts, security requirements, security levels of the space internet security assessment architecture and the security issues of the NEMO basic support protocol, the security architecture of the NSAT system is presented by the system engineering method, and a preliminary discussion on the security issue of the NSAT system is conducted.