Research On The Key Technologies Of Satellite Comunication System Operation Control

Nowadays,the competition among the power nations is becoming more and more fierce,and the space has become the main battleground of high-tech competition.As one of the important developing directions of space information technology,the construction and development of satellite communication system has a profound impact on the national defense security,civil production and other fields,and how to build a intelligent,efficient,reasonable and feasible operational control system is the key of improving the efficiency of satellite communication system.Focusing on the operational control problem of Geosynchronous Earth Orbit(GEO)satellite mobile communication,GEO satellite broadband communication,Low Earth Orbit(LEO)satellite constellation communication,the key operational control technologies of satellite communication system is researched in this thesis,and the main work and innovations are summarized as follows:1.Research on the key technology of resource planning for GEO satellite mobile communication operation control.The calculation model between the GEO satellite spot-beam plane and spherical cover is designed.The mathematical model among the rolling attitude deviation,pitch attitude deviation,yaw attitude deviation of GEO satellite and ground beam coverage is constructed,and the influence of three kinds of deviation on ground beam coverage is analyzed.Based of the multi-model fusion including the satellite mobile communication resource description model,terminal distribution model and communication service model,a resource planning algorithm of GEO satellite mobile communication is put forward.The proposed model and algorithm are implemented and transformed into the country's first military-civilian common "TIANTONG-1" satellite mobile communication system.The practice shows that the above work can provide reasonable design support for attitude control and beam resource planning of GEO satellite system.2.Research on the key technology of resource scheduling for GEO satellite broadband communication operation control.Around the heterogeneous resources and task demands of satellites,networks and stations,a unified model is established based on thought of resource virtualization.The matching constraint problems between the communication mission and satellite,network and station resource are discussed,and the matching relation of satellite resource needs and the corresponding missions is determined.To achieve goal of the highest efficiency of satellite resource utilization,an improved genetic-particle swarm task scheduling algorithm is proposed.The proposed model and algorithm are implemented and transformed into a Chinese military satellite communication system.The practice shows that the above work can provide theoretical support for practical engineering applications such as multi-task resource planning and scheduling.3.Research on the key technology of mobility management for LEO constellation satellite communication operation control.Aiming at the heavy load problem of mobility management caused by high dynamic change of LEO constellation network topology,a mobility management strategy based on the Mobile Foreign Agent Domain(MFAD)in satellite networks is proposed.Base on MFAD,mobile foreign agent of attachment(MFAA)and mobile foreign agent of trusteeship(MFAT),the access switch strategy is devised between Mobile Node(MN)and satellite.With the mobility management strategy,the mobility management process is optimized and the mobility management signaling overhead is reduced.The simulation is carried out to verify the above study,and the result shows that the proposed mechanism can adapt to the high dynamic characteristics of LEO network,reduce the times of information interaction between MN and satellite and the network load of mobility management.4.Research on the Situation Awareness(SA)technology for satellite communication system.In view of the low precision problem of the current system,the situation information acquisition model is established for the satellite communication in different levels of card,equipment,node,network and application,respectively,utilizing the established situation system and obtained situation information.The integrative index system of situation assessment is established,and a system situation evaluation method is proposed by introducing the thought of decision integration and credibility.Combining the advantages of parallel processing and quick learning for Neural Network Algorithm(NNA)and Fuzzy Algorithm(FA)suitable for dealing uncertain semantic variables,the FA-NNA is proposed.The simulation results illustrate that the FA-NNA is better than the traditional BP neural network algorithm in accuracy and speed.