卫星互联网用空间行波管非线性特性模拟  

Simulation of Nonlinear Characteristics of Space Traveling Wave Tubes for Satellite Internet Application

作　　者：梁潇 瞿波[1] 郭恒晖 刘蒙蒙 LIANG Xiao;QU Bo;GUO Heng-hui;LIU Meng-meng(Beijing Vacuum Electronics Research Institute,Beijing 100015,China)

机构地区：[1]北京真空电子技术研究所,北京100015

出　　处：《宇航计测技术》2020年第1期85-90,共6页Journal of Astronautic Metrology and Measurement

摘　　要：为了研究卫星互联网用空间行波管的非线性特性,本文使用行波管一维大信号模型,结合CST软件计算得到的行波管冷特性参数,基于MATLAB平台编写了数值计算程序。使用所编写的程序,以Ka波段和Q波段的两种空间行波管为模型,计算其调幅-调幅(AM-AM)和调幅-调相(AM-PM)的主特性,并同时计算了三阶交调失真(IMD3)和噪声功率比(NPR)。分析了输入功率的回退对这两种非线性特性的影响,并与矢量网络分析仪得到的实际测试结果进行了对比,三阶交调的计算结果与实际测试的误差在1dB以内。为高线性度行波管的设计提供模拟工具。In order to study the nonlinear characteristics of space traveling wave tube(TWT)for satellite internet application,a numerical calculation program was written on the MATLAB platform using an improved one-dimensional largesignal model combined with the cold characteristics parameters of TWT calculated by CST.Using the written program,the main characteristics of amplitude modulation-amplitude modulation(AM-AM)and amplitude modulation-phase modulation(AM-PM)are calculated based on the model of two kinds of space TWT(Ka-band and Q-band).In parallel,third-order intermodulation distortion(IMD3)and noise power ratio(NPR)were also calculated.The effect of input power back-off on these nonlinear characteristics are analyzed and compared with the actual test results from a vector network analyzer,where the discrepancy between the calculated and test results is within 1 dB.A simulation tool is provided for the design of high linearity TWTs.

关 键 词：空间行波管 非线性 三阶交调 噪声功率比 

分 类 号：TN124[电子电信—物理电子学]