摘要
叙述了用 Hilbert变换法实现数字正交相干检波的基本原理 ,分析了其信号流程及镜频产生的过程 ,对该方法中镜频的定义进行了明确阐述 ,提出了直接镜频和间接镜频的概念 ,从滤波器阶数和幅相误差两个方面讨论了镜频抑制问题 ,给出了各镜频点镜频抑制的仿真结果 。
This paper recounts the fundament of quadrature coherent detector via Hilbert transform method. The flow of signal and the process to produce mirror frequencies are analyzed thoroughly. The definition of mirror frequency is expatiated explicitly in this method. The concepts of direct mirror frequency and indirect mirror frequency are put forward creatively. Mirror frequency rejection is discussed from two aspects of filter rank and amplitude and phase errors, and simulation results of mirror frequency rejection are given at every mirror frequency point. Analysis and simulation results are of important reference value to accomplish digital quadrature coherent detector in engineering.
出处
《武汉理工大学学报（交通科学与工程版）》
北大核心
2004年第2期208-211,共4页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
空军科研项目资助
关键词
数字正交相检
Hilbert变换法
镜频
幅相误差
digital quadrature coherent detector
Hilbert transform method
mirror frequency
error of amplitude and phase
