基于Matlab的多普勒频率合成器设计与仿真  

Design and simulation of Doppler frequency synthesizer based on Matlab

作　　者：王小会 李保印 薛延刚 李晓青 Wang Xiaohui;Li Baoyin;Xue Yangang;Li Xiaoqing(School of Electrical Engineering,Lanzhou Institute of Technology,Lanzhou 730050;Digital Government Platform Department,China Telecom Wanwei Information Technology Co.,Ltd.,Lanzhou 730030)

机构地区：[1]兰州工业学院电气工程学院,兰州730050 [2]中电万维信息技术有限责任公司数字政府平台部,兰州730030

出　　处：《现代计算机》2023年第3期73-76,共4页Modern Computer

基　　金：国家自然科学基金项目(51769012);甘肃省高等学校创新能力提升项目(2020A-142);兰州工业学院青年科技创新项目(2020KJ-19)。

摘　　要：为了克服传统接收机接收到的高动态全球定位系统(Global Positioning System,GPS)信号存在多普勒频移现象的问题,对高动态GPS中频信号模拟器中的多普勒频率合成器进行了研究。设计了多普勒频率合成器的三个输入参数,运用合成的多普勒频率控制字作为载波数控振荡器(numerically controlled oscillator,NCO)的输入,采用NCO的正、余弦映射功能产生随时间变化的多普勒信号。仿真结果表明,该方法可以精确地模拟高动态参数,多普勒频率合成器的频率分辨率达到5.96×10^(-4)Hz,有效验证了该方法的正确性。In order to overcome the Doppler shift phenomenon of high dynamic Global Positioning System(GPS)signal re⁃ceived by traditional receivers,the Doppler frequency synthesizer in high dynamic GPS intermediate frequency signal simulator is studied.Firstly,the three input parameters of the Doppler frequency synthesizer are designed.Secondly,the synthesized Doppler frequency control word is used as the input of the carrier numerical control Oscillator(NCO),and the positive and cosine mapping function of NCO is used to generate the time⁃varying Doppler signal.The simulation results show that the proposed method can ac⁃curately simulate high dynamic parameters,and the frequency resolution of the Doppler frequency synthesizer reaches 5.96×10-4 Hz,which effectively verifies the correctness of the proposed method.

关 键 词：多普勒频率 GPS 高动态 NCO 

分 类 号：TN74[电子电信—电路与系统]