钠导光空间通信系统性能特性研究

发布时间：2018-07-04 23:20

本文选题：钠导光空间通信 + 一对多通信　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：钠导星因为可以校正波前畸变而成为自适应光学的研究热点,空间光通信也因为抗干扰能力强等优点成为技术史上重要的发展之一,但是目前空间光通信链路搭建困难,且不能高效的实现一对多通信,所以基于钠导星和空间光通信两种技术,本论文提出了一种钠导光一对多空间通信的方法,并对该通信方法的系统特性进行了建模仿真研究。对理论上高斯光束以一定发射角度传输至钠层高度处时截面的光强分布进行了仿真分析。根据钠原子与589nm激光作用的特性,利用密度矩阵,模拟了发射不同参数的脉冲激光对激发钠原子产生光子数的影响。分析了在地面接收端接收的回波光子数随着不同发射与接收参数变化的趋势。结合钠原子层在大气中间层的高度,建立了计算钠导光空间通信最大数据传输速率的模型,研究了不同发射与接收参数设置对钠导光空间通信最大数据传输速率的影响。对钠导光空间通信系统接收功率进行了建模分析,模拟了接收功率随着不同通信参数设置的变化趋势。考虑大气湍流对发射激光传播的随机影响,利用Zernike多项式建立了多层不等分大气相位屏的数值模拟,仿真了在大气湍流作用下发射激光束传输至钠层90km处的随机光强分布,并计算了随机激发钠原子产生的光子数及接收端的平均接收功率。模拟了接收端接收到的返回光子数以及瞬时光功率随时间的变化情况,并将接收信号与发射信号作对比,证明了钠导光空间通信信息传递性。对通信距离固定时钠导光空间通信链路的最优参数选择进行了研究,在给定通信距离时,获得了满足通信数据传输速率或者接收功率为最优的通信方案。研究了一对多的钠导光空间通信,仿真了当多个接收端不在同一直线时,发射端俯仰角和方位角的设置对各个接收端的影响。通过钠导星可以创新一对多的空间光通信,该通信方法具有提高通信效率、隐蔽接收端、链路搭建简单等优点,具有很强的实际意义,本论文的研究为钠导光空间通信的应用奠定了理论基础。
[Abstract]:Sodium guide star has become the research hotspot of adaptive optics because it can correct wavefront distortion. Space optical communication has become one of the important developments in the history of technology because of its strong anti-jamming ability, but it is difficult to build space optical communication link at present. And it is not efficient to realize one-to-many communication. Therefore, based on the two technologies of sodium guide star and space optical communication, this paper proposes a method of sodium light-guided one-to-many space communication, and makes a modeling and simulation study on the system characteristics of the communication method. The intensity distribution of the cross section of the Gao Si beam propagating at a certain emission angle to the height of the sodium layer is simulated and analyzed theoretically. According to the characteristics of the interaction between sodium atom and 589nm laser, the effect of pulsed laser with different parameters on the number of photons excited by sodium atom is simulated by using density matrix. The variation trend of the number of echo photons received at the ground receiver with different transmitting and receiving parameters is analyzed. According to the height of sodium atom layer in the middle layer of atmosphere, a model for calculating the maximum data transmission rate of sodium photoconductive space communication is established, and the influence of different transmitting and receiving parameters on the maximum data transmission rate of sodium guided optical space communication is studied. The receiving power of sodium photoconductive space communication system is modeled and analyzed, and the changing trend of receiving power with different communication parameters is simulated. Considering the random effect of atmospheric turbulence on laser propagation, a numerical simulation of multi-layer unequal atmospheric phase screen is established by Zernike polynomial, and the random intensity distribution of laser beam propagating to the sodium layer 90km under atmospheric turbulence is simulated. The number of photons generated by randomly excited sodium atoms and the average receiving power at the receiving end are calculated. The number of return photons received at the receiving end and the variation of the instantaneous optical power with time are simulated and compared with the transmitted signals to prove the information transitivity of the sodium-guided optical space communication. In this paper, the optimal parameter selection of sodium photoconductive space communication link with fixed communication distance is studied. When the communication distance is given, a communication scheme satisfying the communication data transmission rate or receiving power is obtained. A one-to-many sodium photo-guided space communication is studied. The effects of the elevation and azimuth of the transmitter on each receiver are simulated when several receivers are not in the same line. Through sodium guide star, one-to-many space optical communication can be innovated. This communication method has the advantages of improving communication efficiency, concealment receiving end, simple link construction and so on. The research in this paper lays a theoretical foundation for the application of sodium-guided optical space communication.
【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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