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1. CN105675981 - FPGA-based frequency meter and frequency measuring method

Office China
Application Number 201610160981.5
Application Date 18.03.2016
Publication Number 105675981
Publication Date 15.06.2016
Grant Number 105675981
Grant Date 07.09.2018
Publication Kind B
IPC
G01R 23/10
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
23Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
02Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
10by converting frequency into a train of pulses, which are then counted
CPC
G01R 23/10
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
23Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
02Arrangements for measuring frequency, e.g. pulse repetition rate
10by converting frequency into a train of pulses, which are then counted ; , i.e. converting the signal into a square wave
Applicants UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
中国科学技术大学
Inventors QIN XI
秦熙
WANG LIN
王淋
RONG XING
荣星
YU HUIYAO
于会尧
XIE YIJIN
谢一进
DU JIANGFENG
杜江峰
Agents 北京集佳知识产权代理有限公司 11227
Title
(EN) FPGA-based frequency meter and frequency measuring method
(ZH) 一种基于FPGA的频率计及频率测量方法
Abstract
(EN)
The application provided a FPGA (Field-Programmable Gate Array)-based frequency meter and a frequency measuring method. The frequency meter comprises a clock source, a host computer, a frequency division shaping unit and a processing unit. The frequency meter utilizes the processing unit to perform once rough time measurement on the rising edge of a signal to be measured corresponding to the rising edge of a frequency division signal in each period of the frequency division signal to obtain a first time value, and utilizes the processing unit to perform multiple fine time measurement on the rising edge of the signal to be measured corresponding to the rising edge of a frequency division signal in each period of the frequency division signal, processes the measuring results of the first time value and the multiple fine time measurement, and obtains the frequency of an external original signal based on a first frequency division multiple and a second frequency division multiple. According to the multiple fine time measurement in the frequency measurement process of a whole external original signal, fine time measurement errors are reduced, and the frequency meter measurement precision on the external original signal frequency is improved.

(ZH)
本申请一种基于FPGA的频率计及频率测量方法,其中,所述频率计包括:时钟源、上位机、分频整形单元及处理单元;所述频率计通过利用处理单元在所述分频信号的各个周期内对与分频信号上升沿相对应的待测信号上升沿进行一次粗时间测量获得第一时间值;并利用处理单元对与分频信号上升沿相对应的待测信号上升沿在所述分频信号的各个周期内进行多次细时间测量,对所述第一时间值及多次细时间测量的测量结果进行处理并结合所述第一分频倍数和所述第二分频倍数计算获得所述外界原始信号的频率。由于在整个外界原始信号的频率测量过程中进行了多次细时间测量,降低了细时间测量的误差,提高了所述频率计对外界原始信号频率的测量精度。