行波管微波非线性参数测试技术研究

发布时间：2018-01-11 13:00

本文关键词：行波管微波非线性参数测试技术研究　出处：《电子科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：行波管(Travelling Wave Tubes)是一种极其重要的真空电子器件,在卫星通信、雷达和电子对抗等领域发挥着重大作用。行波管作为一种器件,需要一些技术参数来描述其特性。评价一只行波管是否合格或者是否符合自身的应用需求,可以通过测试其技术参数作为参考。行波管是对高频信号进行高功率放大的真空电子器件,其技术参数的测量涉及到了多种微波测量技术以及矢量网络分析仪、频谱分析仪等高端测试仪器的使用,这极大的增加了其技术参数的测试难度。因此,准确测量行波管技术参数已成为行波管研制以及应用中必须要解决的难题,同时也是微波测量的应用方向之一。在完成行波管冷参数测试系统以及热参数测试必要器件的基础上,本文对行波管热参数测试进行了系统样机设计并初步编写了自动测试软件。本文集中开展了以下几方面的研究:1.幅相参数测试技术研究。本文中系统样机设计了两种幅相测试方案:一种是基于六端口的幅相测试,利用NET2801数据采集卡对端口幅度信息进行采集从而计算幅相信息;另一种是基于矢量网络分析仪(VNA)的幅相测试,通过MFC编写的自动测试软件控制系统样机将测试路切换到幅相模式,利用矢量网络分析仪来测试幅相参数。行波管的幅相参数测试涉及到幅度非线性、相位非线性、幅相调制(AM-PM)、1dB压缩点等。2.频谱参数测试技术研究。本文中频谱参数测试用到的主要测试仪器是频谱分析仪,利用MFC编写的自动测试软件将测试路切换到频谱参数测试,通过大功率定向耦合器对行波管的输出信号进行取样,从而来对行波管的输出信号进行频谱分析。行波管的频谱参数测试涉及到三阶互调比、噪声功率谱密度等。3.大功率水负载研究。本文在查阅资料的基础上仿真设计了大功率水负载,工作频段2~18GHz,与系统中集成的大功率干负载相比,它的体积小,无需庞大的风冷设备。如果可以将它应用在系统中,将极大的缩小系统整机体积,减小系统的重量。目前由于某些条件的限制该水负载还未加工实测,后期将会进行加工与实测。
[Abstract]:Traveling Wave Tube (TWT) Travelling Wave Tubes is an extremely important vacuum electronic device in satellite communications. Radar and electronic countermeasures play an important role. As a kind of device, traveling wave tube needs some technical parameters to describe its characteristics. Traveling wave tube (TWT) is a vacuum electronic device which can amplify high-frequency signal with high power. The measurement of technical parameters involves a variety of microwave measurement techniques and vector network analyzer. The use of high-end testing instruments, such as spectrum analyzer, greatly increases the difficulty of testing technical parameters. Therefore, accurate measurement of technical parameters of TWT has become a difficult problem to be solved in the development and application of TWT. At the same time, it is also one of the application directions of microwave measurement. Based on the completion of the TWT cold parameter testing system and the necessary devices for thermal parameter testing. In this paper, the system prototype of TWT thermal parameter testing is designed and the automatic test software is written. 1. Research on amplitude-phase parameter testing technology. In this paper, two kinds of amplitude-phase testing schemes are designed: one is based on six-port amplitude-phase testing. The NET2801 data acquisition card is used to collect the port amplitude information to calculate the amplitude and phase information. The other is the amplitude and phase test based on vector network analyzer (VNA). The test path is switched to amplitude-phase mode through the prototype of automatic test software control system written by MFC. The amplitude-phase parameters of TWT are measured by vector network analyzer, which involves amplitude nonlinearity, phase nonlinearity and amplitude-phase modulation (AM-PMM). 1dB compression point et al. 2. Research on spectrum parameter testing technology. In this paper, the main instrument used in spectrum parameter testing is spectrum analyzer. The test path is switched to spectrum parameter test by MFC software, and the output signal of TWT is sampled by high power directional coupler. Thus, the spectrum analysis of the output signal of TWT is carried out. The spectrum parameter measurement of TWT involves the third order Intermodulation ratio. Noise power spectrum density et al. 3. Research on high power water load. In this paper, the high power water load is simulated and designed on the basis of consulting data. The operating frequency band is 2 ~ 18 GHz. Compared with the high power dry load integrated in the system, it is small in size and does not require huge air-cooled equipment. If it can be applied in the system, it will greatly reduce the volume of the whole system. At present, due to the limitation of some conditions, the water load has not been processed and measured, so it will be processed and measured in the later stage.
【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

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