The Research Of Key Technologies On Airborne Fiber-optic Network System

With the further improvement of high speed data-processing and avionics system integrated, the traditional airborne data links based on coaxial cables or twisted-pair cables has been unable to meet the communication needs of the airborne network. Fiber-optic network featured high bandwidth, anti-electromagnetic interference(EMI), light-weight and upgradeable without replacing cable harnesses will provide and revolutionize the performance for many air systems in the future. The airborne optic fiber network adopted the fibre channel(FC) technologies or optical network with wavelength division multiplexing(WDM) technologies become the mainstream choice of airborne network. In order to support the research and development of airborne optic- fiber network system for the typical aircraft, several key technologies of the airborne fiber-optic network system are studied in this thesis. The research across the entire development life cycle of the airborne fiber-optic network system covers from the extraction requirements, design, simulation, and development to the experimental tests, effectively promoting the fiber optic process of the avionics network in C hina. The main innovations are summarized as follows:1. Airborne FC network design and simulation platform has been realized. The airborne FC network design and simulation platform can not only complete the task of designing the airborne FC network, but also provide the simulation and verification of the design results gained from FC network design platform. Airborne FC network design and simulation platform, which based on computer simulation, is an efficient design and development tool with short iterative design cycle and low investment, can guarantee the development of airborne FC network.2. More research efforts focus on hard real-time scheduling algorithm in airborne fiber-optic network to ensure the message transmission performance. Based on the periodic task model of real time communication and traffic characteristics of the avionic network, the message model is built and related message rotating constrained boundary conditions are given. In addition to channel utilization, the different scheduling parameters design influence on more network performance indices have also been considered, eg. Message maximum delay. Multi-channel allocation method can efficiently reduce the splitting times of the message withchannel load- balanced.3. In order to design and realize an optimized network architecture to meet the future upgrades of the avionics network, a novel hybrid switching architecture of airborne network using optical circuit switching and electrical switching for intra-subnet and inter-subnet communication respectively was proposed. Based on this architecture, intra-subnet wavelength routing method is put forward based on arrayed waveguide grating router(AWGR), avoiding of the use of optical switch in OXC. Furthermore, an airborne WDM light source method is presented in this thesis, solving the problem that traditional commercial WDM light source is not suitable to the airborne optical network. By setting up end-to-end delay bound calculated model using the deterministic network calculus theory and the establishment of the energy consumption of the system model, simulation results verify that the proposed architecture outperforms FC switched architecture in terms of real time performance and power consumptio n.4. The airborne FC data simulation and monitoring system as an important development tool of airborne FC network has been realized. Airborne FC data simulation system composed of FIC communication card and data simulation software can simulate the airborne terminal, sending and receiving the FC-AE-ASM protocol data of FC network, meanwhile supporting the functions of network clock and network management. Airborne FC network data monitoring system can realize high data rate, multi conditional filtering, storage and fault analysis, supporting up to 3TB of storage capacity, 3 hours of continuous storage. The FIC port performance testing platform based on simulation and monitoring card is set up, and the testing method under system clock synchronization is put forward. The experimental results show that the FIC port has the characteristics of high bandwidth, low latency, and is suitable for the future avionic network.5. Airborne optical network architecture based on FC over WDM is put forward, and a concrete realization of the system architecture is given. FC over WDM ground experimental environment based on independently developed FC emulator has been established, and experimental results on functional verification and system performance analysis indicate that an adaption of WDM and optical switching in avionics fiber-optic network is feasible.