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激光大气通信的电子学系统设计
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摘要
本文主要对激光大气通信的电子学系统进行了设计。
     论文从激光大气通信的空间环境出发,对光信号传输过程中信道中的大气湍流和背景光噪声干扰问题进行了分析,并在此基础上论述了激光大气通信系统的结构和基本组成,结合课题的技术指标,给出了发射和接收系统的设计方案及其电路实现。
     文章重点叙述了传输系统中数字信号的复接与分接技术。数字复接中采用八路2M口数据输入,其中后两路采用直接输入“0”码或“1”码的方法,提高了信息传输的有效性,便于提取帧同步码,降低了编译码过程的复杂性,同时也降低了系统的电路复杂程度。论文对系统中的器件进行了优化选择,并对系统工作过程进行了详细的测试与分析。
     论文最后给出了实验结果。实验结果表明,系统的设计达到了课题的性能指标要求,同时也证明了本设计的合理性和可行性。
The paper mainly designs the part of electronics of laser atmospheric communication system.
    Considering space environment of laser atmospheric communication, The thesis analyses issues of atmosphere turbulance and interference of background light noise during the course of transmission, furthermore, discusses the structure and basic constitute of the laser atmospheric communication system. Combining the technical index requirement of the subject, it provides design scheme and circuit of the transmitting and receiving system.
    The article lays emphasis on signal multiplexing and demultiplexing technique of transmission system. The input data of the multiplexing adopts 8 channels with the speed of 2mb/s, and those of the last two channels are "0"and "1" respectively, in order to improve the transimision effeciency and deminish the complexity of encode and electronic circuit concerned, furthermore, it makes the synchronous signal acquisition more easier. The thesis makes a optimal choice of the needed devices , analysing and testing the working course of system in detail.
    The thesis provides the experimental result finally. The experimental result shows that the designed system satisfies the required performance index. It is proved the system design is reasonable and feasible.
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