【摘要】：大功率多信道通信系統(tǒng)的在現(xiàn)代通信領(lǐng)域中應(yīng)用越來越廣,系統(tǒng)中無源器件(如功率分配器、耦合器、濾波器、連接器以及傳輸線等)產(chǎn)生的非線性已嚴(yán)重影響通信系統(tǒng)的信道容量和通信質(zhì)量。無源互調(diào)(Passive Inter-Modulation,簡(jiǎn)稱PIM)是由兩個(gè)或兩個(gè)以上的頻率在無源器件中混合而產(chǎn)生的新的頻率分量。本文是基于某大功率行波管測(cè)試系統(tǒng)中的無源器件對(duì)系統(tǒng)測(cè)試精度影響而設(shè)定。通過對(duì)無源非線性的分析和研究實(shí)現(xiàn)了大功率行波管測(cè)試系統(tǒng)的測(cè)試誤差分析。首先,了解了國(guó)內(nèi)外無源非線性研究的發(fā)展動(dòng)態(tài),分析了無源非線性的特性及產(chǎn)生機(jī)理,和降低無源非線性的幾項(xiàng)措施,比較了幾種無源非線性的分析方法。分析了射頻連接器無源非線性產(chǎn)生原理,建立了連接器非線性點(diǎn)源模型,對(duì)射頻連接器的非線性進(jìn)行了理論分析、并編寫了仿真軟件。并對(duì)信號(hào)源諧波以及由前級(jí)驅(qū)動(dòng)放大器的非線性對(duì)行波管非線性的影響進(jìn)行了分析和仿真。然后,對(duì)無源非線性測(cè)試方法進(jìn)行了比較,并結(jié)合本文的研究對(duì)象及實(shí)驗(yàn)條件,對(duì)射頻連接器的無源非線性效應(yīng)給出了對(duì)比測(cè)試方法。研制了中心頻率為1.85GHz、帶寬為30MHz的大功率低互調(diào)窄帶帶通濾波器,利用濾波器、放大器、功率合成器和定向耦合器等組件了驗(yàn)證測(cè)試系統(tǒng)。最后,根據(jù)非線性理論分析和驗(yàn)證了測(cè)試結(jié)果。針對(duì)大功率行波管非線性測(cè)試系統(tǒng),進(jìn)行了非線性的誤差分析。編制了非線性參數(shù)測(cè)試誤差仿真軟件,獲得了該系統(tǒng)的非線性參數(shù)測(cè)試誤差。
[Abstract]:High-power multi-channel communication system is more and more widely used in the field of modern communication. Passive devices (such as power divider, coupler, filter, etc.) are used in the system. The nonlinearity of connectors and transmission lines has seriously affected the channel capacity and communication quality of communication systems. Passive Inter-Modulation (PIM) is a new frequency component produced by mixing two or more frequencies in a passive device. This paper is based on the influence of passive devices in a high power TWT test system. Through the analysis and research of passive nonlinearity, the error analysis of high power TWT test system is realized. Firstly, the development trends of passive nonlinear research at home and abroad are studied, the characteristics and mechanism of passive nonlinearity are analyzed, and several measures to reduce passive nonlinearity are analyzed, and several analysis methods of passive nonlinearity are compared. The principle of passive nonlinear generation of RF connectors is analyzed, the nonlinear point source model of connectors is established, the nonlinear characteristics of RF connectors are theoretically analyzed, and the simulation software is developed. The influence of the harmonic of the signal source and the nonlinearity of the amplifier driven by the front stage on the nonlinearity of the TWT is analyzed and simulated. Then, the passive nonlinear testing methods are compared, and the passive nonlinear effect of RF connectors is compared with the research object and experimental conditions in this paper. A high power low intermodulation narrowband band pass filter with a central frequency of 1.85 GHz and a bandwidth of 30MHz is developed. The verification and testing system is developed using filter, amplifier, power synthesizer and directional coupler. Finally, the test results are analyzed and verified according to the nonlinear theory. The nonlinear error analysis is carried out for the high power TWT nonlinear measurement system. The nonlinear parameter testing error simulation software is developed, and the nonlinear parameter testing error of the system is obtained.
【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】：2015
【分類號(hào)】：TN124
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本文編號(hào)：2161136