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  本文選題：微波光子學　切入點：射頻對消　出處：《南京航空航天大學》2016年碩士論文

【摘要】：在連續(xù)波雷達和全雙工無線通信系統(tǒng)中,由于系統(tǒng)工作在同時收發(fā)模式,當收發(fā)南線間的距離較近時,會有部分發(fā)射信號傳輸?shù)浇邮漳暇�上造成系統(tǒng)自干擾,從而導致一系列嚴重的后果。因此如何抑制泄漏信號,提高系統(tǒng)隔離度已成為提升系統(tǒng)性能的一個關鍵因素。為了解決這一問題,國內(nèi)外學者提出了多種解決方案,其中最具發(fā)展?jié)摿Φ氖巧漕l對消技術。然而由于各類電子器件的工藝水平受到限制,使得系統(tǒng)調(diào)節(jié)精度存在電子瓶頸,對消深度無法提升,于是人們最近又提出了光子射頻對消技術。受益于光學器件工作寬帶南,調(diào)節(jié)精度高等優(yōu)良性能,光子對消系統(tǒng)的對消深度相比電子系統(tǒng)南南提升。在這一技術背景下,我們對光子射頻對消技術進行深度研究。主要包括以下三個方面:1.在理論方面,對射頻對消技術的原理進行公式推導和理論分析,提出了對消性能的評價指標,并用MATLAB仿真技術繪制了等對消深度曲線圖,更直觀的分析了幅度和相位誤差對系統(tǒng)對消深度的影響,為下文的設計提供理論基礎。2.分析現(xiàn)有光子對消方案的不足,在解決對消技術中存在的色散引發(fā)的信號功率衰落問題方面,提出了基于偏振調(diào)制器的光子射頻對消系統(tǒng)。用偏振調(diào)制器實現(xiàn)對消信號與泄漏信號的反相調(diào)制,用可調(diào)光延時線和可調(diào)光衰減器實現(xiàn)信號延時和幅度的匹配,從而實現(xiàn)對消。先從原理分析了偏振調(diào)制系統(tǒng)實現(xiàn)對消的過程,接著分析偏振調(diào)制器實現(xiàn)色散補償?shù)脑?最后搭建實驗系統(tǒng),成功實現(xiàn)了泄漏信號的對消和功率衰落點的調(diào)節(jié)。3.在解決泄漏信號多徑傳輸干擾方面,提出了基于色散延時的光子射頻對消系統(tǒng)。同樣用偏振調(diào)制器實現(xiàn)對消信號與泄漏信號的反相調(diào)制,不同之處在于通過調(diào)節(jié)光源波長和輸出光功率實現(xiàn)信號的等幅反相狀態(tài),實現(xiàn)對消。先從原理分析可調(diào)諧色散補償模塊的工作過程,得出延時與色散值之間的關系。接著分別對不同路徑干擾情況下的對消過程進行分析,再進行實驗,成功測試了系統(tǒng)在不同路徑干擾下的對消深度。最后,測試了鏈路的一些基本性能參數(shù),并與已有方案的性能相比,得出所提方案的優(yōu)缺點。
[Abstract]:In the continuous wave radar and full duplex wireless communication system, because the system works in the mode of simultaneous receiving and sending, when the distance between the southern lines is close, some of the transmitted signals will be transmitted to the receiving southern line, which will cause system self-interference. Therefore, how to suppress leakage signals and improve system isolation has become a key factor to improve system performance. In order to solve this problem, domestic and foreign scholars have put forward a variety of solutions. The most promising one is radio frequency cancellation technology. However, due to the limitation of the process level of all kinds of electronic devices, there is an electronic bottleneck in the adjustment accuracy of the system, and the cancellation depth cannot be improved. The photonic radio frequency cancellation technology has been proposed recently. The photonic cancellation system has a higher cancellation depth than the electronic system because of the excellent performance of optical devices, such as wide band south, high regulation precision, etc. In this technical background, We study the photonic radio frequency cancellation technology in depth. It mainly includes the following three aspects: 1. In theory, the formula derivation and theoretical analysis of the radio frequency cancellation technology are carried out, and the evaluation index of cancellation performance is put forward. The curve of equal cancellation depth is drawn by MATLAB simulation technology, and the influence of amplitude and phase error on the cancellation depth is analyzed more intuitively, which provides the theoretical basis for the following design. 2. The deficiency of existing photon cancellation scheme is analyzed. In order to solve the problem of signal power fading caused by dispersion in cancellation technology, a photon radio frequency cancellation system based on polarization modulator is proposed. The polarization modulator is used to realize the inverse modulation of cancellation signal and leakage signal. The signal delay and amplitude matching are realized by using the adjustable light delay line and the adjustable optical attenuator, and the cancellation is realized. Firstly, the process of the polarization modulation system is analyzed from the principle, and then the principle of the polarization modulator to realize the dispersion compensation is analyzed. Finally, the experimental system is set up, which successfully realizes the cancellation of leakage signal and the adjustment of power fading point .3. in solving the multi-path transmission interference of leakage signal, A photon radio frequency cancellation system based on dispersion delay is proposed. The polarization modulator is also used to realize the inverse phase modulation of the cancellation signal and the leakage signal. The difference lies in the realization of the state of equal amplitude inverse phase of the signal by adjusting the wavelength of the light source and the output optical power. The working process of the tunable dispersion compensation module is analyzed from the principle, and the relationship between delay and dispersion value is obtained. Then, the cancellation process under different path interference is analyzed, and then the experiment is carried out. The cancellation depth of the system under different path interference is successfully tested. Finally, some basic performance parameters of the link are tested, and compared with the performance of the existing scheme, the advantages and disadvantages of the proposed scheme are obtained.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TN761;TN911.7

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本文編號：1656455