【作者】 周海勇；

【导师】 王友仁；

【作者基本信息】 南京航空航天大学 ， 电机与电器， 2005， 硕士

【摘要】 本课题研究飞机电力线载波数据通信相关的网络传输函数及硬件实现技术,本课题的研究对推动我国现有军用飞机机载电力线载波数据通信技术的发展具有重要意义。 本课题首先分析了国内外民用电力线载波数据通信技术的发展与现状,然后在分析了飞机供电网络特性和电力线高频特性理论的基础上,对飞机机载电网进行高速数据通信的网络传输函数进行了模型仿真。仿真结果显示,飞机供电网络对高频信号的衰减和相位偏移影响不大。对飞机载波通信存在的各种电磁干扰源进行了比较详细的分析,并提出了相关的电磁干扰处理方法。 基于常用 QPSK 调制解调方式,设计了飞机电力线载波数据通信硬件实现电路,该电路以 DSP 芯片为信号处理核心,包括发送和接收端信号耦合电路、数模和模数转换电路以及异步串口通信电路等。设计了 QPSK 程序、A/D 采样子程序、RS232 串口通信程序。对硬件电路板进行了制作并对部分电路进行了实验调试。 最后给出了研究工作总结和后续研究工作的建议。更多还原

【Abstract】 In this paper, the key technology of PLC (Power Line Communication) for the airborne e1ectromechanical communication system is studied, which has great economic value to accelerate the modernization of aeronautic equipments in our army. The paper introduces the research and recent development of low-voltage power line communication technology, which is used widely in commercial area. After analyzing the characteristics of power supply network in aeroplane, a theoretical model for transfer function is established based on the principles of parameters of power line cables in high frequency. The result of simulation by the software Matlab shows that signal attenuation and phasic excursion in high frequency is feasible for high speed communication over power networks in aeroplane. The factors which cause electromagnetic compatibility problems in power line communication are also investigated in detail, and the method to minish the EMC effects is also researched. Based on the DSP, the physical circuit, which mainly contains signal coupling circuit, A/D and D/A circuit, asynchronous communication circuit, is designed. The software related is also designed based on the circuit. The modulation achieved by software is QPSK, which is extensively used in PLC. The circuit and PCB of the PLC modem is designed by EDA software Protel Dxp.Software related such as QPSK,A/D,RS232,is designed.Some parts of the circuit is debugged. The summary and prospect of the research is given finally.更多还原