【摘要】：激光通信滿足了人們對大數(shù)據(jù)率通信的要求,然而激光在大氣介質(zhì)的通信過程中會產(chǎn)生散射作用,而散射光也攜帶著重要的信息。由于紫外光散射作用明顯,并且相應(yīng)探測器的迅速發(fā)展,使得紫外光散射光通信發(fā)展迅速。由于激光通信中常用紅外光或近紅外光進(jìn)行通信,如果能夠?qū)崿F(xiàn)近紅外光波長的大氣散射光通信,便可以利用散射光通信來實(shí)現(xiàn)軍事等方面的應(yīng)用。因此,有必要進(jìn)行近紅外光的大氣散射光通信的研究。首先,以大氣光學(xué)中的散射及吸收基本理論為基礎(chǔ),并利用單次散射理論模型,進(jìn)行近紅外光大氣散射光通信中系統(tǒng)鏈路的理論傳輸模型建立。該模型中闡述了散射和吸收作用的影響,散射相函數(shù)在散射過程中的作用。在引入橢球坐標(biāo)系下,研究了各物理參數(shù)對于整個系統(tǒng)影響的理論模型。詳細(xì)闡明了影響接收功率值的幾何和系統(tǒng)結(jié)構(gòu)參數(shù)的理論模型關(guān)系。其次,在理論模型的建立基礎(chǔ)之上,重點(diǎn)研究了各幾何參數(shù)對于接收功率值和路徑損耗的影響。通過仿真結(jié)果,可以得到選擇近紅外光波長進(jìn)行通信較好。在近紅外光波段下,距離越小,接收孔徑值越大,在給出的最佳收發(fā)仰角值下接收功率值就越大。同時發(fā)射半角和接收半角的值越大接收功率的值越大,進(jìn)而關(guān)于各參數(shù)對于路徑損耗的影響也進(jìn)行了詳細(xì)的討論。最后,基于單次散射理論模型,得出系統(tǒng)對于最小脈沖間隔的理論要求,并給出幾何條件下的最大通信數(shù)據(jù)率和通信距離關(guān)系,并以此為基礎(chǔ),在給定探測器的情況下,討論了通信數(shù)據(jù)率、通信距離、收發(fā)仰角和收發(fā)半角對于發(fā)射功率要求的理論模型,并給出了仿真結(jié)果及分析。結(jié)合開關(guān)鍵(OOK)調(diào)制方式,根據(jù)通信速率得出誤碼率的理論結(jié)果及分析,并給出系統(tǒng)概略試驗(yàn)設(shè)計方案。經(jīng)過理論上的研究,將為后續(xù)近紅外光散射通信實(shí)驗(yàn)提供理論依據(jù),具有重要指導(dǎo)意義。
[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.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.1

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