A Research On Key Technologies Of Large-Scale Satellite Network

With the advancement of aerospace integration and the rapid development of aerospace technology,many businesses have an increasingly urgent demand for satellite networking.Limited by the performance of a single satellite,large-scale satellite ad hoc has become a research hotspot.This thesis focuses on the research of related technologies for the scenario of large-scale satellite ad hoc network,including the research of its related routing protocols,and carries out comprehensive design and simulation according to the typical task scenario of the application layer and the timevarying characteristics of the underlying topology.Provide predictable and guaranteed network communication services for upper layer applications.Firs of all,aiming at the dynamic networking scenario of large-scale star cluster,combined with the characteristics of satellite orbit parameters and Qo S requirements,this thesis puts forward the satellite cluster networking scheme.This chapter establishes an inter satellite ad hoc network architecture from physical layer,data link layer to network layer,which can meet the needs of large-scale satellite networking under high dynamic time-varying topology.In this thesis,the OPNET simulation platform is built to import the actual operation orbit of the satellite,and the above scheme is simulated and verified,which verifies the correctness and superiority of the scheme from multiple dimensions.Secondly,aiming at the problems of wireless channel resource utilization,network congestion and communication transmission time in satellite networks,A regional routing method based on Manhattan network model is proposed to ensure reliable routing in large-scale satellite networks.Referring to Manhattan network model,routing forwarding action is simplified and routing control message overhead is saved.Then,aiming at the special satellite network scenario and routing oscillation,this thesis simulates and improves the scheme.Simulation results show that compared with the traditional OLSR routing scheme,this scheme can effectively save routing overhead and wireless channel resources.Finally,aiming at the problem that the small satellite ad hoc network using OLSR routing protocol is vulnerable to node isolation attack,this thesis proposes a security architecture based on blockchain.In view of the small size and limited resources of small satellites,this thesis makes adaptive changes to the structure of blockchain and consensus algorithm,so that the security architecture based on blockchain can adapt to the special scenario of small satellite ad hoc network.Finally,the effectiveness of each function of this method is verified by simulation.