As1773 Airborne Data Bus

The integration of the avionics is the technology that integrated the information and function of the avionics under the circumstances of the severe limit of the space, strict requirement of the reliability and the particular real time restraints. Therefore the airborne data transmitting bus are one of the key technologies of the avionics integrated system. In the design of the avionics integrated system, the performance of the airborne data transmitting bus played an indispensable role.AS1773 bus is the standard of the SAE established airborne inner optical fiber bus. It developed on the basis of the MIL-STD-1553 and MIL-STD-1773 which haven been widely applied. AS1773 bus possesses the prominent features such as the high reliability, strong anti-EMP/EMI, light and flexibility of the network. Thus, we can construct high performance airplane optic fiber control system on the basis of it. The existing avionic system has already set higher standard of the exchanging capability the data information. Today there are no our own R&D AS 1773 bus system. In order to keep pace with the international state of art technology, we are liable to perform our own R&D on the optic fiber transmission data bus and the optic fiber control system. Henceforth, the analysis and design of the system is of great importance.The dissertation carefully analyzes the AS1773 bus system structure and utilizes the emulation software OPNET to establish AS1773 system emulation model with the help of the avionic system. The dissertation analyzed the various performance indexes of the synchronic and diachronic messages of the system under the circumstance of the different load. This dissertation establishes the bus system model which is adaptable to the synchronic and diachronic messages and contributes some helpful conclusions by means of contrastive analysis. On the basis of that, this dissertation put forward prioritization scheme for the airborne data bus system. Meanwhile, the dissertation discusses the processing of the nonperiodic messages. Finally, the dissertation put forward the dispatching plan of the system.