计量学报Issue(3)：272-275,4.DOI:10.3969/j.issn.1000-1158.2014.03.16
低信噪比下基于Chirp信号的频率特性测试方法
A Measurement Method of Frequency Response Characteristics Test Based on Chirp Signai at Low SNR
摘要
Abstract
A method using band-pass filter and wavelet packet transform to pre-treat signal and then using FFT analysis and treatment to get frequency response diagrams is described. This method is better to solve the problems that frequency characteristic test of the system is under low SNR,and reduce hardware requirements of acquisition system in the test. The research show that when SNR is very low and even negative 20 dB value,the amplitude-frequency characteristic that accuracy is not less than 1dB and phase frequency response curve that accuracy is not less than 3°can be obtained for frequency bands that is below the cutoff frequency,which fully meet the system performance evaluation and controller design application requirements.关键词
计量学/频率特性/小波包变换/FFTKey words
Metrology/Frequency characteristics/Wavelet packet transform/FFT分类
通用工业技术引用本文复制引用
魏列江,李旭方,王霖,董万玉,孟犁..低信噪比下基于Chirp信号的频率特性测试方法[J].计量学报,2014,(3):272-275,4.基金项目
国家自然科学基金（51365208）；863计划项目 （）
