| With the emergence and development of aviation and information technology,the airplane has helped human beings break through the space limitation,while the Internet has directly enabled human beings to cross the dimension of time and space.Nowadays,civil aviation has become the primary transportation choice for many people,and people’s requirements for the service experience in the air cabin are progressively greater demanding.Not only do cabin crews need more convenient,stable and reliable cabin audio network system,but passengers also have more entertainment and diversified needs for the audio network system.However,the original traditional cabin audio network system has been unable to meet the needs of people accustomed to a variety of Internet entertainment experiences in daily life.Therefore,how to develop an audio network architecture that is more close to people’s professional and entertainment needs has become an urgent task for cabin builders and system developers.However,due to the extreme requirements of high safety and reliability of aircraft equipment design,it is necessary to complete theoretical simulation,trial production analysis of simulation software system,physical on-board performance test,long-term cycle verification and other steps,which result in a long time period and large investment in the process.The traditional cabin audio network system is still built on the traditional bus technology,and its network working mode still uses circuit switching to transmit data,and its bandwidth and expansibility are limited.With the innovation of the new generation of communication technology,such as Ethernet based switching technology,optical fiber technology and other aviation applications,as well as network optimization,voice codec and other mature technologies,it is possible to apply related technologies such as packet switched VoIP network telephony technology to the audio network voice system.This thesis will consider the application of the soft-phone technology protocol stack based on SIP protocol to the design of the civil aviation cabin audio network system,to achieve a set of simulation software system applied in the Linux operating system,and analyze its performance advantages and disadvantages,to provide reference for the development of aviation equipment.The work of this thesis is to complete aircraft equipment design steps of simulation software system test analysis steps,with the background of the civil aviation passenger cabin environment,to absorb the advantage of the Internet in the development of related technology advantage,and think about transformation is applied to the field of civil aviation passenger cabin audio network system,finally to design and implement a set of civil aviation passenger cabin audio network simulation software system.Based on the analysis and elaboration of the development background and requirements of civil aviation cabin audio network simulation software system,and considering the advantages and applicability of modern communication technology,this thesis conducts a detailed demand analysis on the core functions involved in cabin audio network,such as cabin voice broadcast and its application scenarios.Then the detailed design scheme of the architecture and function of the communication technology applied to the civil aviation cabin audio network system is given and the simulation software system is written and realized according to the above technical scheme.At the end of this thesis,the simulation software system completed in this thesis is tested on the Linux ring network environment built by ordinary PC.By analyzing the call delay performance of the core functions of the system,the feasibility of applying packet switched VoIP calling technology to the cabin environment is verified. |
