本文選題：鈉導(dǎo)光空間通信 + 一對(duì)多通信　； 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：鈉導(dǎo)星因?yàn)榭梢孕Ｕㄇ盎兌蔀樽赃m應(yīng)光學(xué)的研究熱點(diǎn),空間光通信也因?yàn)榭垢蓴_能力強(qiáng)等優(yōu)點(diǎn)成為技術(shù)史上重要的發(fā)展之一,但是目前空間光通信鏈路搭建困難,且不能高效的實(shí)現(xiàn)一對(duì)多通信,所以基于鈉導(dǎo)星和空間光通信兩種技術(shù),本論文提出了一種鈉導(dǎo)光一對(duì)多空間通信的方法,并對(duì)該通信方法的系統(tǒng)特性進(jìn)行了建模仿真研究。對(duì)理論上高斯光束以一定發(fā)射角度傳輸至鈉層高度處時(shí)截面的光強(qiáng)分布進(jìn)行了仿真分析。根據(jù)鈉原子與589nm激光作用的特性,利用密度矩陣,模擬了發(fā)射不同參數(shù)的脈沖激光對(duì)激發(fā)鈉原子產(chǎn)生光子數(shù)的影響。分析了在地面接收端接收的回波光子數(shù)隨著不同發(fā)射與接收參數(shù)變化的趨勢(shì)。結(jié)合鈉原子層在大氣中間層的高度,建立了計(jì)算鈉導(dǎo)光空間通信最大數(shù)據(jù)傳輸速率的模型,研究了不同發(fā)射與接收參數(shù)設(shè)置對(duì)鈉導(dǎo)光空間通信最大數(shù)據(jù)傳輸速率的影響。對(duì)鈉導(dǎo)光空間通信系統(tǒng)接收功率進(jìn)行了建模分析,模擬了接收功率隨著不同通信參數(shù)設(shè)置的變化趨勢(shì)�？紤]大氣湍流對(duì)發(fā)射激光傳播的隨機(jī)影響,利用Zernike多項(xiàng)式建立了多層不等分大氣相位屏的數(shù)值模擬,仿真了在大氣湍流作用下發(fā)射激光束傳輸至鈉層90km處的隨機(jī)光強(qiáng)分布,并計(jì)算了隨機(jī)激發(fā)鈉原子產(chǎn)生的光子數(shù)及接收端的平均接收功率。模擬了接收端接收到的返回光子數(shù)以及瞬時(shí)光功率隨時(shí)間的變化情況,并將接收信號(hào)與發(fā)射信號(hào)作對(duì)比,證明了鈉導(dǎo)光空間通信信息傳遞性。對(duì)通信距離固定時(shí)鈉導(dǎo)光空間通信鏈路的最優(yōu)參數(shù)選擇進(jìn)行了研究,在給定通信距離時(shí),獲得了滿足通信數(shù)據(jù)傳輸速率或者接收功率為最優(yōu)的通信方案。研究了一對(duì)多的鈉導(dǎo)光空間通信,仿真了當(dāng)多個(gè)接收端不在同一直線時(shí),發(fā)射端俯仰角和方位角的設(shè)置對(duì)各個(gè)接收端的影響。通過(guò)鈉導(dǎo)星可以創(chuàng)新一對(duì)多的空間光通信,該通信方法具有提高通信效率、隱蔽接收端、鏈路搭建簡(jiǎn)單等優(yōu)點(diǎn),具有很強(qiáng)的實(shí)際意義,本論文的研究為鈉導(dǎo)光空間通信的應(yīng)用奠定了理論基礎(chǔ)。
[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.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.1

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