摘要
数字锁相放大器以相敏检测技术为基本原理,能够准确地测量周期信号的幅值与相位信息。微弱信号中常常会包含直流分量、线性分量以及噪声分量等杂讯因素,这些杂讯均会对微弱信号中周期信号的幅度测量造成较大影响。分析微弱信号可能存在的误差,对锁相环算法进行优化设计并采用MATLAB仿真分析证明了算法的可行性。最后搭建了测试平台,通过模拟电流信号并在其中加入噪声信号,分别通过数字锁相环放大器进行幅值测量并分析,误差的大小在0.5%左右。
Digital phase loop amplifier is based on phase sensitive detection technology,which can accurately measure the amplitude and phase information of periodic signal.Weak signal often contains noise factors such as DC component,linear component and noise component,which will have a great impact on the amplitude measurement of periodic signal in weak signal.The possible error of weak signal is analyzed,and the PLL algorithm is optimized.The feasibility of the algorithm is proved by MATLAB simulation analysis.Finally,by simulating current signal and adding noise signal into it,and amplitude is measured and analyzed by digital phase locked loop amplifier.The error is about 0.5%.
作者
苑效宁
马少华
董鹤楠
YUAN Xiaoning;MA Shaohua;DONG Henan(School of Electrical Engineering,Shenyang University of Technology,Shenyang,Liaoning 110870,China;Electric Power Research Institute of State Grid Liaoning Electric Power Co.,Ltd.,Shenyang,Liaoning 110006,China)
出处
《东北电力技术》
2022年第1期41-44,49,共5页
Northeast Electric Power Technology
关键词
微弱信号检测
直流分量
线性分量
数字锁相放大器
weak signal detection
DC component
linear component
digital lock-in amplifier
