数据中继卫星光通信链路仿真及关键技术分解

【作者】 艾扬利；

【导师】 胡渝；

【作者基本信息】 电子科技大学 ， 机械电子工程， 2003， 硕士

【摘要】 与微波通信相比，空间光通信具有很多优点：通信容量可以显著增大； 发射光束窄，方向性好，功率密度显著增加；天线尺寸小，系统质量相对小；抗电磁干扰，保密性强等等。传输同样速率与信息的装备，光通信的性价比最高，很适合卫星与卫星、卫星与航天飞机等空间站之间高数码率信息的传输。基于空间激光通信良好的应用前景，各个国家都非常重视对空间激光通信的研究工作。数据中继卫星光通信链路的计算机仿真研究是数据中继卫星光通信项目研究的一个重要研究内容。本论文根据国家有关部门下达的关于空间光通信的高新技术的研究课题，拟配合系统总体设计，完成光通信链路的理论分析、建模及仿真工作。论文首先讨论了空间光通信的优势、主要应用场合及研究空间光通信的意义，然后介绍了各国在空间光通信研究中的成果，并就空间光通信的应用前景及发展趋势进行了概括性的论述。随后讨论了空间光通信系统的主要结构和组成部件，阐述了空间光通信的具体工作过程，并对各部分的主要器件的结构和功能做了较详细的分析，同时对系统设计所应注意的关键技术和要点进行了讨论。理论分析和建模部分则分析了包括光发射、光信道、光接收在内的整个通信链路，研究了包括基带信号、编码、激光调制到光电变换、解调、解码、恢复基带信号等空间光链路发、收传输的整个过程，提出了系统的模型。论文配合总体系统设计要求，对长波长和短波长两个波段的三种可能的方案分别进行了仿真研究，并进行了相应的分析和比较，得出结论，为系统总体设计时选择最佳的方案提供参考。本文给出数据中继卫星光通信链路计算机仿真研究结果，作为数据中继卫星光通信系统研究的一部分。论文完成了对数据中继卫星光通信链路的理论分析、建模和仿真工作。通过本论文的完成，表明空间（卫星）光通信链路是能够实现通信的，进一步证实了空间光通信系统的可行性。更多还原

【Abstract】 Compared with microwave communication, space optical communication has much superiority: much greater communication capability, narrow beam, good direction, much greater power density functions , lesser antenna size and whole mass , and high capability of anti-electromagnetism and secrecy. Because of its high function-price ratio, under the condition of transmitting same information and same data rate, it is very fit for high data transmission ratio between satellite and satellite, satellite and space shuttle, and so on. So each country attaches important attention to space optical communication.The simulation of optical communication between data relay satellites is an important content of the research project of the optical communication between data relay satellites. According to the high technique task about space optical communication arranged by relative department of government, this paper present theoretic analysis , modeling and simulation for the whole system.The characteristics and superiority of laser optical communication technology used in free space is presented in the paper. The application foreground as well as development trend about the space optical communication are introduced. Then the main structure, integral parts and detailed work process of space optical communication are narrated, especially, the key technologies are discussed. The chapter of theoretical analysis and modeling includes baseband signal , coding, modulation, as well as optical electric transform, demodulation, decoding, the recovery of baseband signal.According to the request of the whole system, we have studied three possible schemes for long wavelength and short wavelength, finished correlative analysis and comparison, and presented the conclusion. This paper concludes the result of computer simulation of data relay satellite optical communication channel, playing a part of the system research of data relay satellite optical communication, and completed the theoretic analysis, modeling and simulation. Furthermore, we proved the feasibility of space satellites optical communication.更多还原