一种基于欠采样的高频正弦信号初相测量方法  

A Method of Initial Phase Measurement of High Frequency Sinusoidal Signal Based on Sub-nyquist Sampling

作　　者：姚锡钦[1] 郑胜峰[1] YAO Xiqin;ZHENG Shengfeng(Zhejiang Industry&Trade Vocational College,Wenzhou 325003,China)

机构地区：[1]浙江工贸职业技术学院,浙江温州325003

出　　处：《浙江工贸职业技术学院学报》2021年第3期52-55,63,共5页Journal of Zhejiang Industry & Trade Vocational College

摘　　要：本文研究了一种基于最大公因子频率的欠采样特高频率初相测量方法,介绍了两个正弦信号之间的频率关系并详细分析了其特点,并将此频率之间的相位关系应用于高频信号的采集中,可以在不满足乃奎斯特采样定理的条件下,用低于被测信号频率的信号对被测高频信号进行同步采样,结合数字正交变化技术和多重互相关技术,实现了对高频正弦信号的初相的准确测量,实验结果表明本文方法实现了对高频信号的初相的准确测量,尤其在低信噪比下也有较高的测量准确度.A new method for phase measurement based on sub-nyquist sampling technology is researched in this paper.The fre-quency relationship between two signals is introduced and its characteristic is analyzed.The principle is used in data acquisition of high frequency.Equivalent sampling technology is abstained,which is not accord with Nyquist sampling theorem combining with digi-tal quadrature transformation and multi-layer correlation.The phase of high frequency sinusoidal is detected.Simulation results shows that the high resolution for high frequency signals especially in low signal-noise ratio condition.

关 键 词：欠采样 初相 数字正交变化 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]