本文選題：空間光通信 + 衍射光學(xué)�。� 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著信息社會(huì)不斷發(fā)展,衛(wèi)星激光通信的研究逐漸受到各國(guó)關(guān)注。由于終端光學(xué)系統(tǒng)各項(xiàng)指標(biāo)對(duì)激光通信的影響重大,進(jìn)一步優(yōu)化其光學(xué)系統(tǒng)對(duì)提升終端性能顯得尤為重要。對(duì)于衛(wèi)星光通信終端的發(fā)射系統(tǒng),使用環(huán)形光避開(kāi)卡式天線次鏡遮擋的過(guò)程中,發(fā)射光束的環(huán)形模型以及環(huán)形光與天線系統(tǒng)的參數(shù)設(shè)計(jì)對(duì)最終的優(yōu)化結(jié)果有一定的影響。本文采用近年研究熱度較高的雙高斯環(huán)形光代替較早提出的雙半高斯環(huán)形光,并與研究熱度同樣較高的平頂環(huán)形光進(jìn)行對(duì)比分析。選擇合適的環(huán)形光模型并研究輸入光與光闌之間的最優(yōu)匹配參數(shù)對(duì)提升天線能量利用率和深入了解環(huán)形光傳輸特點(diǎn)有著重要的意義。本文針對(duì)衛(wèi)星激光通信環(huán)形光方案優(yōu)化選型以及實(shí)現(xiàn)環(huán)形激光整形進(jìn)行了以下工作:(1)對(duì)比分析了近年來(lái)提出的一種高效雙高斯環(huán)形光代替陳舊模型后對(duì)衛(wèi)星光通信的影響,以此來(lái)研究更適用于衛(wèi)星激光通信的環(huán)形光模型。主要對(duì)三種模型的近場(chǎng)衍射中心能量、遠(yuǎn)場(chǎng)終端天線入瞳功率以及與之相對(duì)應(yīng)的整形元件的成像精度進(jìn)行了仿真。通過(guò)綜合比較,平頂環(huán)形光遠(yuǎn)場(chǎng)入瞳功率峰值雖最高,但對(duì)參數(shù)匹配精確度要求較高;而雙高斯環(huán)形光的穩(wěn)定性最強(qiáng),遠(yuǎn)場(chǎng)入瞳功率較高,容錯(cuò)能力更強(qiáng),能夠適用的系統(tǒng)更寬泛,各方面性能均較為優(yōu)秀。(2)為求得更高遠(yuǎn)場(chǎng)入瞳功率所對(duì)應(yīng)的雙高斯環(huán)形光參數(shù)與環(huán)形光闌的參數(shù)匹配最優(yōu)解,針對(duì)環(huán)形入射光與環(huán)形光闌的特殊通光性質(zhì),采用了一種新的分析方案對(duì)光學(xué)系統(tǒng)參數(shù)與入瞳功率的關(guān)系進(jìn)行了全局考察。通過(guò)仿真獲得能達(dá)到最高入瞳功率的最優(yōu)參數(shù)匹配曲線圖,對(duì)工程設(shè)計(jì)有一定的指導(dǎo)意義。(3)在設(shè)計(jì)環(huán)形光整形衍射光學(xué)元件的過(guò)程中,為保留GS算法運(yùn)算速度快的優(yōu)勢(shì),同時(shí)降低其迭代極值瓶頸,使用了一種幾何追跡構(gòu)建初值的方法,并將幾何輪廓相位化后帶入算法中。迭代結(jié)果顯示構(gòu)建的初值較平面相位和隨機(jī)相位而言,成像圖樣均方誤差更低。(4)為了解環(huán)形激光整形元件在工程實(shí)現(xiàn)中可能引入的誤差對(duì)元件性能的影響,仿真分析了臺(tái)階量化、縱向及橫向誤差與衍射效率、峰值能量率以及成像均方誤差的關(guān)系。仿真結(jié)果表明,適當(dāng)增加臺(tái)階數(shù)可以很大程度上提高衍射效率,同時(shí)引入的橫向誤差對(duì)近場(chǎng)成像結(jié)果和遠(yuǎn)場(chǎng)入瞳功率的影響相較縱向誤差而言更為嚴(yán)重。
[Abstract]:With the development of information society, the research of satellite laser communication has been paid more and more attention. Because of the great influence of various optical system indexes on laser communication, it is very important to further optimize the optical system to improve the performance of the terminal. For the transmission system of satellite optical communication terminal, the ring model of the emitting beam and the parameter design of the annular light and antenna system have certain influence on the final optimization results in the process of using annular light to avoid the blocking of the secondary mirror of the card antenna. In this paper, the double Gao Si ring light, which has been studied in recent years, is used to replace the double half Gao Si ring light, which has been put forward earlier, and is compared with the flat-top ring light with the same heat intensity. It is important to select an appropriate annular light model and study the optimal matching parameters between the input light and the aperture to enhance the energy utilization ratio of the antenna and to deeply understand the characteristics of the ring optical transmission. In this paper, the optimal selection of ring optical scheme for satellite laser communication and the realization of ring laser shaping are compared and analyzed. The influence of an efficient double Gao Si ring light instead of the old model proposed in recent years on satellite optical communication is compared and analyzed. The ring optical model which is more suitable for satellite laser communication is studied. The near field diffraction center energy of the three models, the power of the far field terminal antenna entering pupil and the imaging accuracy of the corresponding shaping elements are simulated. Through comprehensive comparison, although the peak-value of farfield entry pupil power of flat-top annular light is the highest, the accuracy of parameter matching is high, while the stability of double- annular light is the strongest, the power of far-field entry pupil is higher, and the fault tolerance ability is stronger. In order to obtain the matching optimal solution between the double Gao Si ring optical parameters and the annular aperture parameters corresponding to the higher far field pupil power, the system that can be applied is broader, and the performance of all aspects is better. According to the special optical properties of ring incident light and annular aperture, a new analytical scheme is proposed to study the relationship between the optical system parameters and the power of the entrance pupil. Through simulation, the optimal parameter matching curve which can reach the maximum input pupil power is obtained, which has a certain guiding significance for engineering design. In the process of designing ring light shaping diffraction optical element, the GS algorithm has the advantage of fast operation speed. At the same time, the bottleneck of iterative extremum is reduced, and a geometric tracing method is used to construct the initial value, and then the geometric contour phase is introduced into the algorithm. The iterative results show that the initial values constructed are lower than the plane phase and random phase, and the mean square error of the imaging pattern is lower. 4) in order to understand the effect of the errors that may be introduced in the engineering implementation of the ring laser shaping elements on the performance of the components, The relationship between step quantization, longitudinal and transverse errors and diffraction efficiency, peak energy rate and imaging mean square error is analyzed by simulation. The simulation results show that the diffraction efficiency can be greatly improved by increasing the number of steps, and the influence of the lateral error on the near field imaging results and the far field pupil power is more serious than that of the longitudinal error.
【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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