微波大功率系统非线性参数分析方法研究
发布时间：2018-08-03 08:09
【摘要】：大功率多信道通信系统的在现代通信领域中应用越来越广,系统中无源器件(如功率分配器、耦合器、滤波器、连接器以及传输线等)产生的非线性已严重影响通信系统的信道容量和通信质量。无源互调(Passive Inter-Modulation,简称PIM)是由两个或两个以上的频率在无源器件中混合而产生的新的频率分量。本文是基于某大功率行波管测试系统中的无源器件对系统测试精度影响而设定。通过对无源非线性的分析和研究实现了大功率行波管测试系统的测试误差分析。首先,了解了国内外无源非线性研究的发展动态,分析了无源非线性的特性及产生机理,和降低无源非线性的几项措施,比较了几种无源非线性的分析方法。分析了射频连接器无源非线性产生原理,建立了连接器非线性点源模型,对射频连接器的非线性进行了理论分析、并编写了仿真软件。并对信号源谐波以及由前级驱动放大器的非线性对行波管非线性的影响进行了分析和仿真。然后,对无源非线性测试方法进行了比较,并结合本文的研究对象及实验条件,对射频连接器的无源非线性效应给出了对比测试方法。研制了中心频率为1.85GHz、带宽为30MHz的大功率低互调窄带带通滤波器,利用滤波器、放大器、功率合成器和定向耦合器等组件了验证测试系统。最后,根据非线性理论分析和验证了测试结果。针对大功率行波管非线性测试系统,进行了非线性的误差分析。编制了非线性参数测试误差仿真软件,获得了该系统的非线性参数测试误差。
[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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN124
，
本文编号：2161136
[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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN124
，
本文编号：2161136
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