近红外光大气散射通信关键技术的研究

发布时间：2018-12-27 21:06

【摘要】：激光通信满足了人们对大数据率通信的要求,然而激光在大气介质的通信过程中会产生散射作用,而散射光也携带着重要的信息。由于紫外光散射作用明显,并且相应探测器的迅速发展,使得紫外光散射光通信发展迅速。由于激光通信中常用红外光或近红外光进行通信,如果能够实现近红外光波长的大气散射光通信,便可以利用散射光通信来实现军事等方面的应用。因此,有必要进行近红外光的大气散射光通信的研究。首先,以大气光学中的散射及吸收基本理论为基础,并利用单次散射理论模型,进行近红外光大气散射光通信中系统链路的理论传输模型建立。该模型中阐述了散射和吸收作用的影响,散射相函数在散射过程中的作用。在引入椭球坐标系下,研究了各物理参数对于整个系统影响的理论模型。详细阐明了影响接收功率值的几何和系统结构参数的理论模型关系。其次,在理论模型的建立基础之上,重点研究了各几何参数对于接收功率值和路径损耗的影响。通过仿真结果,可以得到选择近红外光波长进行通信较好。在近红外光波段下,距离越小,接收孔径值越大,在给出的最佳收发仰角值下接收功率值就越大。同时发射半角和接收半角的值越大接收功率的值越大,进而关于各参数对于路径损耗的影响也进行了详细的讨论。最后,基于单次散射理论模型,得出系统对于最小脉冲间隔的理论要求,并给出几何条件下的最大通信数据率和通信距离关系,并以此为基础,在给定探测器的情况下,讨论了通信数据率、通信距离、收发仰角和收发半角对于发射功率要求的理论模型,并给出了仿真结果及分析。结合开关键(OOK)调制方式,根据通信速率得出误码率的理论结果及分析,并给出系统概略试验设计方案。经过理论上的研究,将为后续近红外光散射通信实验提供理论依据,具有重要指导意义。
[Abstract]:Laser communication meets the requirements of big data rate communication. However, laser scattering plays an important role in the communication process of atmospheric media, and scattered light also carries important information. Due to the obvious effect of ultraviolet light scattering and the rapid development of corresponding detectors, the communication of ultraviolet scattering light is developing rapidly. Since infrared or near-infrared light is commonly used to communicate in laser communication, if the atmospheric scattering light communication of near-infrared light wavelength can be realized, the scattering light communication can be used to realize military applications and so on. Therefore, it is necessary to study the atmospheric scattering light communication in near infrared light. Firstly, based on the basic theory of scattering and absorption in atmospheric optics and using the single scattering theory model, the theoretical transmission model of the system link in near-infrared atmospheric scattering light communication is established. The influence of scattering and absorption and the function of scattering phase function in the scattering process are discussed in this model. In the ellipsoidal coordinate system, the theoretical model of the influence of physical parameters on the whole system is studied. The relationship between geometry and system structure parameters affecting the received power is described in detail. Secondly, based on the theoretical model, the effects of geometric parameters on the received power and path loss are studied. The simulation results show that the near infrared wavelength can be selected for communication. In the near infrared band, the smaller the distance is, the larger the receiving aperture is, and the larger the receiving power is under the given optimal elevation angle. At the same time, the more the value of the transmitting half angle and the receiving half angle is, the bigger the value of the received power is, and the influence of each parameter on the path loss is also discussed in detail. Finally, based on the theoretical model of single scattering, the theoretical requirements of the system for minimum pulse spacing are obtained, and the relationship between the maximum communication data rate and the communication distance under geometric conditions is given. The theoretical models of the transmission power requirements of the communication data rate, communication distance, elevation angle and half angle are discussed, and the simulation results and analysis are given. Combined with the open key (OOK) modulation mode, the theoretical results and analysis of BER are obtained according to the communication rate, and the design scheme of the system is given. The theoretical study will provide the theoretical basis for the subsequent NIR communication experiments, which is of great significance.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1

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