scholarly journals Erratum: Corrigendum: High-Resolution Group Quantization Phase Processing Method in Radio Frequency Measurement Range

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Baoqiang Du ◽  
Dazheng Feng ◽  
Yaohua Tang ◽  
Xin Geng ◽  
Duo Zhang ◽  
...  
Keyword(s):  
High Resolution ◽  
Radio Frequency ◽  
Frequency Measurement ◽  
Measurement Range ◽  
Processing Method ◽  
Group Quantization

scholarly journals High-Resolution Group Quantization Phase Processing Method in Radio Frequency Measurement Range

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Baoqiang Du ◽  
Dazheng Feng ◽  
Yaohua Tang ◽  
Xin Geng ◽  
Duo Zhang ◽  
...  
Keyword(s):  
High Resolution ◽  
Radio Frequency ◽  
Phase Difference ◽  
Logic Gate ◽  
Frequency Measurement ◽  
Measurement Range ◽  
Measurement Precision ◽  
Processing Method ◽  
Complex Frequency ◽  
Group Quantization

Abstract Aiming at the more complex frequency translation, the longer response time and the limited measurement precision in the traditional phase processing, a high-resolution phase processing method by group quantization higher than 100 fs level is proposed in radio frequency measurement range. First, the phase quantization is used as a step value to quantize every phase difference in a group by using the fixed phase relationships between different frequencies signals. The group quantization is formed by the results of the quantized phase difference. In the light of frequency drift mainly caused by phase noise of measurement device, a regular phase shift of the group quantization is produced, which results in the phase coincidence of two comparing signals which obtain high-resolution measurement. Second, in order to achieve the best coincidences pulse, a subtle delay is initiatively used to reduce the width of the coincidences fuzzy area according to the transmission characteristics of the coincidences in the specific medium. Third, a series of feature coincidences pulses of fuzzy area can be captured by logic gate to achieve the best phase coincidences information for the improvement of the measurement precision. The method provides a novel way to precise time and frequency measurement.

A Simple Photonic-Assisted Microwave Frequency Measurement System Based on MZI With Tunable Measurement Range and High Resolution

2010 ◽  
Vol 22 (15) ◽  
pp. 1162-1164 ◽  
Author(s):  
Jian Dai ◽  
Kun Xu ◽  
Xiaoqiang Sun ◽  
Jian Niu ◽  
Qiang Lv ◽  
...  
Keyword(s):  
High Resolution ◽  
Measurement System ◽  
Microwave Frequency ◽  
Frequency Measurement ◽  
Measurement Range

scholarly journals Frequency synchronization detection method based on adaptive frequency standard tracking

Open Physics ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 434-438
Author(s):  
Xin Geng ◽  
Baoqiang Du ◽  
Jianwei Zhang ◽  
Erlin Tian
Keyword(s):  
Detection Method ◽  
Wide Band ◽  
Frequency Standard ◽  
Frequency Measurement ◽  
Measurement Range ◽  
Period Change ◽  
Measured Signal ◽  
Frequency Synchronization ◽  
Measured Frequency ◽  
Field Programmable

Abstract In order to achieve wide-band high-resolution frequency measurement, a frequency synchronization detection method based on adaptive frequency standard tracking is proposed based on the quantized phase processing. First, the nominal value of the measured frequency signal was obtained from the rough frequency measurement module. Then, the field programmable gate array generated the nominal value of the measured frequency. After that, the direct comparison between the tracking frequency and the measured signal was carried out. Finally, the group quantized processing module gave the final result according to the phase full-period change time. Experimental results showed that the method has a wide frequency measurement range and high accuracy and can obtain frequency stability of the order of 10−13/s.

scholarly journals Measuring Current in a Power Converter Using Fuzzy Automatic Gain Control

2021 ◽  
Vol 11 (13) ◽  
pp. 5793
Author(s):  
Bartosz Dominikowski
Keyword(s):  
High Resolution ◽  
Fuzzy Controller ◽  
Automatic Gain Control ◽  
Gain Control ◽  
Measurement Range ◽  
Power Converter ◽  
Current Measurement ◽  
Dc Power ◽  
Programmable Gain ◽  
Electric Loads

The accuracy of current measurements can be increased by appropriate amplification of the signal to within the measurement range. Accurate current measurement is important for energy monitoring and in power converter control systems. Resistance and inductive current transducers are used to measure the major current in AC/DC power converters. The output value of the current transducer depends on the load motor, and changes across the whole measurement range. Modern current measurement circuits are equipped with operational amplifiers with constant or programmable gain. These circuits are not able to measure small input currents with high resolution. This article proposes a precise loop gain system that can be implemented with various algorithms. Computer analysis of various automatic gain control (AGC) systems proved the effectiveness of the Mamdani controller, which was implemented in an MCU (microprocessor). The proposed fuzzy controller continuously determines the value of the conversion factor. The system also enables high resolution measurements of the current emitted from small electric loads (≥1 A) when the electric motor is stationary.

High Resolution Frequency Measurement Techniques for Relaxation Oscillator Based Capacitive Sensors

2021 ◽  
pp. 1-1
Author(s):  
Laxmeesha Somappa ◽  
Shahid Malik ◽  
Shuchin Aeron ◽  
Sameer Sonkusale ◽  
Maryam Shojaei Baghini
Keyword(s):  
High Resolution ◽  
Measurement Techniques ◽  
Relaxation Oscillator ◽  
Frequency Measurement ◽  
Capacitive Sensors

The Measurement Of Subtle Structural Changes In Yba2cu3O7-x By Processing High Resolution Tem Images

1999 ◽  
Vol 5 (S2) ◽  
pp. 196-197
Author(s):  
J.C. Barry ◽  
J.A. Alarco
Keyword(s):  
Image Processing ◽  
High Resolution ◽  
Structural Changes ◽  
Processing Method ◽  
Recent Theory ◽  
Major Focus ◽  
Image Processing Method ◽  
Transmission Electron ◽  
High Resolution Tem ◽  
Structural Modulation

Since the discovery of high temperature superconducting (HTS) ceramics there has been a great deal of discussion about theories of superconductivity. In a recent theory it has been proposed that the Tc's in these new materials are related in some way to a subtle phase separation in the structure. HTS ceramics have been studied quite intensively by high resolution transmission electron microscopy (HRTEM) and by electron diffraction (ED). In such studies the major focus invariably has been on the periodic structure of the object. However, early HRTEM work on Yba2cu3O7-x by Barry found that in addition to the crystalline order, the Yba2cu3O7-x HTS has a non-periodic structural modulation. In this work we have used an image processing method to look for subtle structural changes in Yba2cu3O7-x by measuring the bending of lattice fringes at twin planes. The image processing method is similar to the method used by Hetherington to study rigid body displacements at gold grain boundaries.

scholarly journals Photonics-Assisted Serial Channelized Radio-Frequency Measurement System With Nyquist-Bandwidth Detection

2014 ◽  
Vol 6 (6) ◽  
pp. 1-7 ◽  
Author(s):  
Hongwei Chen ◽  
Ruiyue Li ◽  
Cheng Lei ◽  
Ying Yu ◽  
Minghua Chen ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Measurement System ◽  
Frequency Measurement

High-Resolution Multiple Microwave Frequency Measurement Based on Stimulated Brillouin Scattering

2012 ◽  
Vol 24 (13) ◽  
pp. 1115-1117 ◽  
Author(s):  
Shilie Zheng ◽  
Sixuan Ge ◽  
Xianmin Zhang ◽  
Hao Chi ◽  
Xiaofeng Jin
Keyword(s):  
High Resolution ◽  
Brillouin Scattering ◽  
Stimulated Brillouin Scattering ◽  
Microwave Frequency ◽  
Frequency Measurement ◽  
Stimulated Brillouin
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