【摘要】：微波信號(hào)光纖穩(wěn)相傳輸技術(shù)是研究通過(guò)光纖鏈路來(lái)傳輸高相位穩(wěn)定度微波信號(hào)的技術(shù),其在基礎(chǔ)科學(xué)研究、深空無(wú)人網(wǎng)絡(luò)等領(lǐng)域有著快速發(fā)展。C波段微波信號(hào)作為下行頻段在3.7GHz~4.2GHz的信號(hào),常用于衛(wèi)星通信下行頻段傳輸?shù)男盘?hào)頻段。然而,在信號(hào)傳輸過(guò)程中,系統(tǒng)各部分組件受外部環(huán)境因素變化的影響,會(huì)使遠(yuǎn)端接收到的微波信號(hào)產(chǎn)生相位抖動(dòng),影響信號(hào)準(zhǔn)確性。光纖作為微波信號(hào)穩(wěn)相傳輸系統(tǒng)的主要媒介,具有低損耗、高帶寬、不易受電磁干擾、成本低等眾多特性,同時(shí)也成為長(zhǎng)距離信號(hào)傳輸系統(tǒng)中信號(hào)相位抖動(dòng)的主要原因,所以在光纖傳輸之前要實(shí)時(shí)快速的補(bǔ)償光纖產(chǎn)生的相位延時(shí)使遠(yuǎn)端恢復(fù)出的信號(hào)相位穩(wěn)定不變。在中心端的實(shí)時(shí)相位檢測(cè)和相位補(bǔ)償是微波信號(hào)穩(wěn)相傳輸系統(tǒng)的關(guān)鍵問(wèn)題。本論文先是將近年來(lái)國(guó)內(nèi)外的微波信號(hào)光纖穩(wěn)相傳輸系統(tǒng)中各種思路展開(kāi)的設(shè)計(jì)方案做了分析總結(jié)和比較,對(duì)他們的系統(tǒng)性能和結(jié)構(gòu)作了對(duì)比評(píng)價(jià),引出了現(xiàn)有方案的眾多問(wèn)題所在。然后討論了光纖穩(wěn)相傳輸系統(tǒng)主要組件對(duì)信號(hào)傳遞相位變化的影響,給出了信號(hào)穩(wěn)定度的描述方式。研究了一種副載波復(fù)用、相位共軛穩(wěn)相的信號(hào)傳輸穩(wěn)相系統(tǒng)方案,從原理上證明了方案適用于信號(hào)的穩(wěn)相傳輸,闡述了各部分組成,評(píng)價(jià)了該方案相位補(bǔ)償范圍大和相位補(bǔ)償速度快的特點(diǎn)。針對(duì)微波信號(hào)光纖傳輸系統(tǒng)的主要組件的溫度特性對(duì)信號(hào)相位的影響,在實(shí)驗(yàn)方案中總結(jié)分析得到了各部分對(duì)信號(hào)相位噪聲影響程度較小,計(jì)算得到光纖隨溫度變化的延時(shí)系數(shù)達(dá)到39.5ps km1 C1--???,是信號(hào)相位波動(dòng)的主要原因。然后研究了一種對(duì)環(huán)路電混頻的微波信號(hào)傳輸方案進(jìn)行改進(jìn),通過(guò)探測(cè)信號(hào)的光纖長(zhǎng)距離往返傳輸,在相位差檢測(cè)中得到信號(hào)在光纖傳輸中的相位波動(dòng),控制光程補(bǔ)償器件消除相位噪聲,達(dá)到最終遠(yuǎn)端信號(hào)的相位穩(wěn)定。
[Abstract]:The technology of optical fiber stabilized phase transmission of microwave signal is to study the transmission of high phase stability microwave signal through optical fiber link, which is studied in basic science. Deep space unmanned network and other fields have a rapid development. C-band microwave signal as the downlink frequency band in the 3.7GHz~4.2GHz signal, often used in satellite communications downlink band signal frequency band. However, in the process of signal transmission, the components of the system are affected by the change of external environment factors, which will cause phase jitter in the microwave signal received from the far end and affect the accuracy of the signal. As the main medium of microwave signal phase stabilization transmission system, optical fiber has many characteristics, such as low loss, high bandwidth, not easy to be interfered by electromagnetic, low cost and so on. At the same time, it also becomes the main reason of signal phase jitter in long distance signal transmission system. Therefore, the phase delay generated by the fiber must be compensated in real time and fast before the fiber is transmitted, so that the phase of the signal recovered from the far end is stable and invariant. Real-time phase detection and phase compensation at the center end are the key problems in the phase-stabilized transmission system of microwave signal. In this paper, the design schemes of microwave signal fiber stabilized phase transmission system in recent years are analyzed, summarized and compared, and their system performance and structure are compared and evaluated. It leads to many problems of the existing scheme. Then, the influence of the main components of the fiber stabilized phase transmission system on the signal transfer phase change is discussed, and the description of the signal stability is given. In this paper, a scheme of signal transmission and phase stabilization system with subcarrier multiplexing and phase conjugation stabilization is studied. It is proved in principle that the scheme is suitable for the stable phase transmission of signal, and the composition of each part is expounded. The large range of phase compensation and the fast speed of phase compensation are evaluated. In view of the influence of temperature characteristics of the main components of microwave signal optical fiber transmission system on the signal phase, the conclusion and analysis of the experimental scheme show that the influence of each part on the signal phase noise is relatively small. The delay coefficient of the fiber with temperature is calculated to be 39.5ps km1 C1-, which is the main reason of the signal phase fluctuation. Then, an improved microwave signal transmission scheme of loop electric mixing is studied. The phase fluctuation of the signal in fiber transmission is obtained in the phase difference detection by detecting the signal from the fiber to and from the long distance. The phase noise is eliminated by controlling the optical path compensation device, and the phase stability of the final remote signal is achieved.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.11

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