本文選題：空間光通信 + 卡塞格倫天線��； 參考：《電子科技大學(xué)》2017年碩士論文

【摘要】：隨著空間領(lǐng)域的擴(kuò)展和高質(zhì)量通信的需求,空間光通信技術(shù)因其重量輕且體積小,但容量大和抗干擾能力強(qiáng)等主要優(yōu)點(diǎn),已然成為國際研究熱點(diǎn)。空間光通信是一項融合多個關(guān)鍵技術(shù)的綜合研究項目,目前仍面臨著很多技術(shù)難題,其中,作為整個空間激光通信系統(tǒng)中不可或缺的部件,光學(xué)天線占據(jù)著極其重要的地位,其傳輸效率更是直接決定了空間光通信的品質(zhì)。為了保證空間光通信系統(tǒng)能以高精度的技術(shù)性能在苛刻的環(huán)境條件下正常工作,并提供穩(wěn)定可靠的傳輸服務(wù),有必要對光學(xué)天線的主要性能進(jìn)行進(jìn)一步的研討和分析。因此,根據(jù)文獻(xiàn)和實(shí)際工程需要,本文主要以卡塞格倫天線為研究對象,其光傳輸性能為主題展開研究分析。首先探討了光學(xué)天線處于熱環(huán)境條件下時,線性熱膨脹對天線傳輸性能的影響,其次,為了解決傳統(tǒng)卡塞格倫天線出現(xiàn)的中心次鏡遮擋導(dǎo)致的能量損失問題,依據(jù)光學(xué)天線系統(tǒng)設(shè)計的根本原理和基本方法,提出了一種結(jié)構(gòu)更加優(yōu)化的新型光學(xué)天線系統(tǒng)方案,并對系統(tǒng)進(jìn)行分析、仿真和研究。本文主要內(nèi)容如下:(1)概述了空間光通信的優(yōu)勢和研究意義,整理了國內(nèi)外空間光通信的發(fā)展動態(tài)及趨勢,并通過對空間光通信關(guān)鍵技術(shù)的分析了解提出了本文的主題。(2)介紹了光學(xué)天線系統(tǒng)的基礎(chǔ)理論及天線的分類,并歸納概括了各類型的光學(xué)天線的主要特點(diǎn),通過對幾種常見的光學(xué)天線的工作原理、基礎(chǔ)結(jié)構(gòu)和特性的分析,總結(jié)了光學(xué)天線設(shè)計的要點(diǎn),為后續(xù)內(nèi)容的設(shè)計、分析、研究和仿真打下了堅實(shí)的理論基礎(chǔ)。(3)從線性熱膨脹的理論出發(fā),推導(dǎo)出在線性熱膨脹下,拋物面和雙曲面反射鏡的曲面方程,并以此為基礎(chǔ)分別對發(fā)生線性熱膨脹的卡塞格倫型發(fā)射天線和接收天線兩個模塊進(jìn)行建模分析。借助矢量反射定理,利用Matlab分別給出了發(fā)射天線和接收天線的光線追跡仿真結(jié)果,并對天線的性能進(jìn)行了分析與總結(jié)。(4)針對傳統(tǒng)卡塞格倫天線出現(xiàn)的中心次鏡遮擋導(dǎo)致的能量損失問題,提出了新型帶導(dǎo)角的錐形雙拋物卡塞格倫天線結(jié)構(gòu)設(shè)計方案,給出了理論推導(dǎo)過程、優(yōu)化系統(tǒng)結(jié)構(gòu)參數(shù)及系統(tǒng)性能的具體分析,并進(jìn)行了仿真研究。
[Abstract]:With the expansion of the space field and the demand of high quality communication, the space optical communication technology has become the international research hotspot because of its light weight and small volume, but large capacity and strong anti-jamming ability. Space optical communication is a comprehensive research project that integrates many key technologies. At present, it still faces many technical difficulties, among which, as an indispensable part of the whole space laser communication system, optical antenna occupies an extremely important position. The transmission efficiency directly determines the quality of space optical communication. In order to ensure that the space optical communication system can work normally under harsh environment with high precision technical performance and provide stable and reliable transmission service, it is necessary to further study and analyze the main performance of optical antenna. Therefore, according to the need of literature and practical engineering, this paper mainly focuses on the Cassegrain antenna, whose optical transmission performance is the subject of research and analysis. Firstly, the effect of linear thermal expansion on the transmission performance of optical antenna in thermal environment is discussed. Secondly, in order to solve the problem of energy loss caused by the central secondary mirror occlusion of the traditional Cassegrain antenna, the effect of linear thermal expansion on the transmission performance of the antenna is discussed. According to the basic principle and method of optical antenna system design, a new type of optical antenna system with more optimized structure is proposed, and the system is analyzed, simulated and studied. The main contents of this paper are as follows: (1) the advantages and research significance of space optical communication are summarized, and the development trends and trends of space optical communication at home and abroad are summarized. The basic theory of optical antenna system and the classification of antenna are introduced through the analysis and understanding of the key technologies of space optical communication. The main characteristics of each type of optical antenna are summarized. Through the analysis of the working principle, basic structure and characteristics of several common optical antennas, the main points of the optical antenna design are summarized. Based on the theory of linear thermal expansion, the surface equations of paraboloid and hyperboloid mirror under linear thermal expansion are derived. Based on this model, the two modules of Cassegrain type antenna and receiving antenna with linear thermal expansion are modeled and analyzed respectively. With the help of vector reflection theorem, the ray tracing simulation results of transmitting antenna and receiving antenna are given by Matlab, respectively. The performance of the antenna is analyzed and summarized. (4) aiming at the energy loss caused by the occlusal of the central secondary mirror in the traditional Cassegrain antenna, a new type of tapered double-parabolic Cassegrain antenna with guide angle is proposed. The process of theoretical derivation, the analysis of system structure parameters and system performance are given, and the simulation research is carried out.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN820

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