基于Hilbert变换的正交检波器设计新方法  

New method for design of quadrature detector based on Hilbert transform

作　　者：邱兆坤[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《系统工程与电子技术》2010年第10期2045-2048,共4页Systems Engineering and Electronics

摘　　要：实信号处理实现正交检波时,通道间不匹配必然会产生镜像干扰。提出了一种复解析信号处理实现正交检波的新方法,从理论上消除了通道间不匹配所产生的镜像干扰。复解析信号处理需进行信号的Hilbert变换,分析了一种近似实现Hilbert变换的方法对系统性能的影响,给出了新方法的二阶采样数字化实现方案。与一阶数字化正交检波结构相比,二阶采样方案更利于实时实现。When realizing quadrature detection based on real signal processing,mismatches between channels will surely produce image interference.A new method for design of quadrature detection based on complex analytic signal processing is presented,which eliminates the image interference caused by mismatches between channels in theory.Hilbert transform is needed in complex analytic signal processing.The effect from a rough Hilbert transform to the system is analyzed.Then the digital realizing project of second-order sampling is given.Compared with the one-order sampling digital quadrature detector,the second-order sampling project is advantageous to be realized in real time.

关 键 词：正交检波 HILBERT变换 二阶采样 镜像抑制 

分 类 号：TN957[电子电信—信号与信息处理]