Preliminary Study On The Bottom Fieldbus In The Air Defense Project Electrivcal System

It's important thing of a country to construct air defense project, because it relates to the safety, stabilization and development of a country. The level of automation in our country's air defense project is very low because of traditional reasons. Althoug some intelligent equipment has applied to the bottom of the air defense project electrical system, other equipment and the upper level is not high intelligence resulting in the intelligence level of air defense project not with technological development needs. By studying the air defense project electrical system and analyzing its composition and its subsystems basic control functions, introduce the mainstream fieldbus into the air defense project electrical system to improve the level of civil air defense project at a higher level of intelligence, thereby maximizing its various functions.On the basis of investigating the research status of air defense project and its electrical system, comprehensively and systematically analyze the current composition of our air defense project electrical system and its subsystems basic control functions. Through analyzing and comparing the scene of several typical fieldbus, give the air defense project electrical system framework based on LonWorks, CAN, RS-485 and Modbus with air defense project electrical system subsystem functions, work environment, identify the bottom fieldbus of the air defense project electrical system.On the basis of the air defense project electrical system framework and in conjunction with its own characteristics and the level of automation development, design RS-232/RS-485 conversion module, CAN mixed node with digital and anolog variable, CAN/RS-485 conversion module, LonWorks mixed node with digital and anolog variable, small system based on RS-485 and Modbus. Give their hardware and software design, specific methods and the realization process.The reliability and speediness of information transmitting determine the usability of the air defense project electrical system. Adopt the ameliorated fieldebus transmission time delay model and perfoemance evaluation to analyze transmission time deley, throughput, protocol efficiency,network efficiency and network utilization of the bottom fieldbus of the air defense project electrical...