Research And Implementation Of Key Technologies Of Deterministic Network For Distributed Dynamic Platform

With the continuous development of human exploration and utilization of space,the application requirements for transmitting deterministic data services through satellite communication networks continue to emerge.However,compared with terrestrial wired communication networks,space satellite networks connected by inter-satellite wireless links have special dynamics and uncertainties.In order to support the real-time distributed collaborative tasks on the satellite mobile platform,this thesis studies and attempts to introduce the most promising Time Sensitive Network(TSN)technology into the satellite mobile platform network to improve its real-time performance and certainty.On the whole,this thesis firstly analyzes the dynamic data transmission characteristics of inter-satellite links,studies the key technologies of time-sensitive networks,and discusses in detail the credit-based traffic shaping algorithm(CBS)and the gated scheduling algorithm.Then,the design scheme of the TSN exchange prototype verification system of the satellite mobile platform is proposed,and the main functional modules such as the data frame routing lookup module and the data scheduling and forwarding module are introduced in detail;and,in order to verify the function of the prototype system,an inter-satellite system is built In the link simulation platform,the data generation module and the inter-satellite link delay variation module are designed to simulate the process of satellite data transmission through the inter-satellite link.Finally,the key business flow gated scheduling technology in the TSN switching prototype system of the satellite mobile platform is studied,and an improved scheme suitable for the network transmission characteristics of the satellite mobile platform is proposed,and the preliminary experimental verification is carried out.Due to the importance of gated scheduling and CBS algorithms,this thesis focuses on elaboration.For gating scheduling,a periodic gating scheduling algorithm is proposed according to the periodic dynamic characteristics of satellite inter-satellite links; a multi-level gating scheduling algorithm is proposed for multi-hop inter-satellite links where the arrival time of data is difficult to predict.Modeling and analysis of the effect of the combined use of CBS and gated scheduling on the delay of data stream transmission is carried out.Finally,the simulation analysis of the multi-level gated scheduling algorithm is carried out,and the correctness of the delay analysis when CBS and gated scheduling are used jointly is verified by simulation.The multi-level gate scheduling algorithm proposed in this thesis is not only applicable to the space satellite moving platform network system,but also applicable to the real-time service transmission with complex periodicity of the static link,which is universal.