AS1773航电光纤组网技术研究

【作者】 张剑平；

【导师】 周东；

【作者基本信息】 电子科技大学 ， 光学工程， 2008， 硕士

【摘要】 AS1773航电光纤总线标准是由美国机动车工程师协会颁布的一种机载内部光纤总线的标准,该标准是在MIL-STD-1553B航电总线标准的基础上发展起来的,如我国枭龙战机与嫦娥一号卫星就应用了MIL-STD-1553B航电总线标准。因为AS1773航电总线标准采用光纤作为传输介质,既能与当前广泛使用的MIL-STD-1553B的设备兼容,又能提高新增设备的传输速率,适应航电总线高速化的发展趋势。因此对AS1773航电光纤总线进行组网研究在提升现有装备并延长其使用寿命上具有重要的意义。AS1773航电光纤总线网络由总线控制器、总线监视器、远程终端与光网络组成。通过网络分层表明,AS1773航电光纤总线组网研究需要解决如下问题:1)物理层调制机制的问题;2)链路层与传输层主要根据AS1773航电光纤总线标准,实现消息传输控制与消息的差错处理及数据传输管理;3)驱动层与应用层的设计开发。本文的研究围绕这些问题展开。针对AS1773航电总线存在的调制机制的难题:引入双脉宽曼彻斯特调制机制,该调制机制具有实现难度低,而且能有效解决接收机三种状态识别的问题。最后通过硬件接口卡的验证。AS1773航电总线接口卡包括主机接口模块、协议芯片模块与光收发模块三部分,通过软件与硬件设计来实现。主机接口实现主机与接口卡的通信;协议芯片模块采用FPGA设计实现AS1773航电光纤总线协议;光收发模块通过电路设计实现通断控制,并采用双冗余设计。本文最后进行了组网实验,包括灵敏度与动态范围测试,通过软件与硬件相结合的方式测试分析系统误码率,完成系统的初始化,消息传输实验,包括周期性消息传输与非周期性消息传输,实验结果符合AS1773航电光纤总线标准对时延与消息格式要求。并在此基础上进行总线负载与传输延时分析。本文在AS1773航电光纤总线调制机制的研究、接口卡的设计与实验测试方面获得一定的成果,为AS1773航电光纤组网的进一步研究提供参考价值。更多还原

【Abstract】 AS1773 optical fiber avionics data bus standard is a standard of airborne inner optical fiber bus, which was issued by Society of Automotive Engineers. It developes on the basis of MIL-STD-1553B which was used widely, such as used on FBC-1 battleplan and Chang’E 1 satellite in China. Because optical fiber is used as AS1773 optical fiber avionics data bus communicational media, it not only supports low rate equipments which used widely nowadays, but also supports high rate equipments, which suits the avionics data bus standard developmental direction. Henceforce, the research on AS1773 optical fiber avionics data bus network has important meanings.The system of AS1773 optical fiber avionics data bus is made up by Bus Controller, Bus Monitor, Remote Terminal and optical network. According to the structure of its network, AS1773 optical fiber avionics network research need to solve problems as followings: 1) The difficulty of modulation scheme in physical layer; 2) Messages process,error management and messages transfers management in data link layer and transport layer; 3) Design in driver layer and application layer.To solve the difficulty of modulation scheme in AS1773 optical fiber avionics data bus, Two-Ary Pulse Width Manchester Bi-phase coding is introduced to optical fiber avionics buses.,and it can be used to efficiently solve the problems associated with the fast identification of correct operation states for optical transmitters while maintaining less complexity of transcivers. It is confirmed by hardware platform test at last.AS1773 bus interface board design divides into hardware design and software design, which includes host computer interface, AS1773 standard realization and optical transceiver. The communication between host computer and board device is through host computer interface. The realization of AS1773 standard is achieved by FPGA. Redundancy and switch control is designed in optical transceiver.In the final section, some experiments are tested on AS1773 optical fiber avionics network, including receiver sensity test, error probability test and analysis through hardware and software. Network experiments include system initiation, message transfer experiments which include cycle message and burst message, the results suit time delay and message formats requirements of AS1773 standard. Bus loading and transfer delay analysis are based on the experiments results.This paper has made progress in the research of AS1773 optical fiber avionics buses modulation sheme, board design and experiments, which provides a valuable reference for further research.更多还原