Research And Simulation Of Adaptive Route Technology In Leo Satellite Network Constellation

Small satellite constellation network plays an important role in aerospace field. Its main application fields cover communication and reconaissance, namely tactical communication, strategic reconaissance, battlefield photography, surveillance of missile launch, collection of tactical information, support aircraft and warship, etc.Routing protocol is an important part of the network. The routing protocols used in ground networks do not adapt to the satellite networks because of their characteristics. Constellation design characteristics, characteristics and switching of the user links and inter-satellite links, dynamic changes of the topology of the network have great influence on small satellite routing switch strategy. The background of this thesis is a defense fund project "research on small satellite constellation network multi-path routing and their evaluation model". Based on the analysis of the characteristics and expansibility of the Dynamic Source Routing (DSR) protocol and aiming at the characteristics of small satellite network, an adaptive multi-path routing (AMR) algorithm is put forward. The mail works of this thesis is as follows:Firstly, characteristics of small satellite networks and the difficulty of routing protocol realization in small satellite network are analyzed and the research status of small satellite network routing algorithm is introduced.Secondly, AMR algorithm is analyzed and designed. Aiming at the weakness of DSR routing algorithm used in small satellite network, AMR algorithm is put forward through cross-layer optimization the related information of the physical layer, MAC layer and network layer is gathered and used as a measure of routing metric in AMR. This overcomes the shortcoming of unawareness of node congestion and space environment of the DSR routing protocol. Based on multi-path routing technology, AMR routing algorithm can reduce routing request information broadcasting frequency and make more efficient use of the network bandwidth to transmit data. This is critical for small satellite network which has rapid changes in topological structure. Congestion control technology is also used in AMR routing algorithm. It can reduce packet loss, balance network load distribution, etc. For a long delay satellite network, this is very important.Thirdly, AMR algorithm is designed and implemented in details. Calculation method of measurement information, required data structure and working process of its function modules are designed and implemented.Finally, through OPNET simulation mechanism, model of AMR algorithm is established and simulated. The simulation results show that AMR algorithm can reduce packet loss rate and the number of routing mistakes. AMR algorithm can be used in small satellite network effectively.