Applied Research Of DVB-RCS2 Link In Airborne Broadband Satellite Communication System

Air-to-ground broadband communication technology can realize the data transmission between airborne network and ground,broadband satellite communication technology has become the mainstream technology in air-to-ground broadband communication because of its wide coverage,large communication capacity and high transmission quality.DVB-RCS2 is currently the more advanced technical standard for return satellite communications,and is considered to be an important technology applicable to future data transmission of airborne broadband satellite communication.This thesis analyses the development status of air-to-ground broadband communication and the research status of DVB-RCS2 return link at home and abroad,and provides a detailed analysis of the theories and technologies related to DVB-RCS2 link from three aspects: the spatial propagation characteristics of satellite channel,the theoretical foundation of DVB-RCS2 low layer and the key technologies of physical layer,respectively.In order to realise the simulation of DVB-RCS2 link,this thesis maps the physical layer characteristics of the link to the network layer for presentation,and designs a channel simulation system for DVB-RCS2 link with adjustable and controllable channel conditions.Firstly,this thesis investigates the technical scheme of the system from two aspects: aircraft-satellite channel and link adaptation technology,analyses the satellite channel model applicable to the system,builds a physical layer simulation platform of the DVB-RCS2 link,and carries out simulation analysis to optimise the link adaptation strategy in the system.Then,this thesis presents the overall design of the system,combines the characteristics of airborne broadband satellite communication data transmission,designs a data-driven multi-terminal cooperative working mode,and completes the system architecture and modular design as well as the detailed design and implementation of each functional module.In order to verify the functions and effectiveness of the DVB-RCS2 link channel simulation system,this thesis also designs a DVB-RCS2 link simulation verification platform,which consists of an airborne gateway simulation system and a ground gateway simulation system.The two simulation systems and the DVB-RCS2 link channel simulation system synchronise data through the network to realise the verification platform functions such as link detection,gateway monitoring,communication management,protocol simulation and data presentation.Finally,this thesis builts a test environment based on the project design requirements,and combines the DVB-RCS2 link channel simulation system with a link simulation verification platform to complete functional and performance tests.The test results show that all functions and performance indicators of the DVB-RCS2 link channel simulation system meet the requirements of the project,and the link channel simulation system designed and implemented in this thesis can better simulate the DVB-RCS2 link.