公开(公告)号：US20200011911A1

公开(公告)日：2020-01-09

申请号：US16493184

申请日：2017-07-21

申请人： NO. 24 RESEARCH INSTITUTE OF CHINA ELECTRONICS TECHNOLOGY GROUP CORPORATION

发明人： Yingtai LI ,  Gangyi HU ,  Luncai LIU ,  Fan LIU ,  Jian'an WANG ,  Xin LEI ,  Xiaozong HUANG ,  Guoqiang WANG ,  Jin ZHAO ,  Jianzhuang LI

IPC分类号： G01R23/02

摘要： A high-precision frequency measuring system and method. The system includes: an analog-to-digital conversion module for receiving an analog intermediate frequency signal to convert the analog intermediate frequency signal into a digital intermediate frequency signal; a frequency mixing module for generating two orthogonal local carriers to convert the digital intermediate frequency signal to a digital baseband signal; an extraction filter module for performing low-pass filtering and extraction of the digital baseband signal, so as to reduce a data rate; a Fourier transform module for obtaining a frequency domain signal; a frequency measurement module for obtaining a first frequency measurement value; a scanning module for obtaining a scanned second frequency measurement value; and a selector for selecting either the first frequency measurement value or the second frequency measurement value as a result of frequency measurement. The system and method can improve the accuracy of frequency measurement.