A Method of Generating High-Precision Offset Frequency Based on Quadrature Phase Shift

2013 ◽  
Vol 401-403 ◽  
pp. 8-12 ◽  
Author(s):  
Guo Yong Wang ◽  
Wen Li Wang ◽  
Xiao Hui Li ◽  
Feng Zhu
Keyword(s):  
Phase Shift ◽  
High Precision ◽  
Beat Frequency ◽  
Design Parameters ◽  
Common Source ◽  
Frequency Method ◽  
Quadrature Phase ◽  
Wire Delay ◽  
Frequency Generator ◽  
Offset Frequency

By Studying the Principle of Single Side-Band Mixing, a New Method Based on Quadrature Phase Shift for Generating High-<em></em>Precision Offset Frequency was Proposed. Different Solutions of Precision Quadrature Phase Shift were Designed for Different Frequencies, Including Combining Analog Quadrature Splitter and Wire Delay for 10MHz, Combining Digital Phase Shift Module Using CPLD, Digital Delay Line Chip and Wire Delay for 10kHz. According to the Design Goal, the Design Parameters and Requirements of Narrow-Band Low-Loss Filter were Analyzed. Finally, an Offset Frequency Generator Whose Output Frequency is 9.99999MHz was Developed and an Experiment System is Constructed to Test the Performance of the High-Precision Offset Frequency Generator. According to the Experiment Results, the Following Conclusion can be Drawn that the Allan Deviation of the 9.99999MHz Offset Frequency Generator is 4.03e-13 which is close to the Frequency Stability of 10MHz Signal of Hydrogen Maser MHM-2010 of Sigma Tau Corporation. the High-Precision Offset Frequency Generator can be Used as a Common Source in Dual Mixer Time Difference and as a Reference Signal in Beat Frequency Method.

High-precision Phase-shift Laser Range Finder System Based on Laser Beat-frequency

2014 ◽  
Vol 43 (9) ◽  
pp. 912006 ◽  
Author(s):  
姜成昊 JIANG Cheng-hao ◽  
杨进华 YANG Jin-hua ◽  
张丽娟 ZHANG Li-juan ◽  
王晓坤 WANG Xiao-kun
Keyword(s):  
Phase Shift ◽  
High Precision ◽  
Beat Frequency ◽  
Laser Range Finder ◽  
Range Finder ◽  
Laser Range ◽  
Precision Phase

Design of 10.2299MHz Frequency Source Based on AD9854

2014 ◽  
Vol 568-570 ◽  
pp. 336-339
Author(s):  
Guo Yong Wang ◽  
Ya Liu ◽  
Xiao Hui Li ◽  
Wen Li Wang
Keyword(s):  
Phase Noise ◽  
Beat Frequency ◽  
Reference Signal ◽  
Frequency Stability ◽  
Common Source ◽  
Allan Deviation ◽  
Frequency Method ◽  
Frequency Signal ◽  
Test Set ◽  
Frequency Source

To measure frequency stability of 10.23MHz signal, a 10.2299MHz frequency source based on AD9854 was developed. The performance of frequency source was tested using a phase noise and Allan deviation test set 5125A. According to the experiment results, the following conclusion can be drawn that the Allan deviation of the 10.2299MHz frequency signal is about 2.6E-14 at 1s when the 10MHz reference signal was generated by a frequency and phase offset generator HROG-10. The 10.2299MHz frequency source can be used as a common source in dual mixer time difference and as a reference signal in beat frequency method when measuring the frequency stability of 10.23MHz signal.

LED MODULE WITH ELECTRONIC ILLUMINATION CONTROL

2019 ◽  
Vol 1 (12) ◽  
pp. 146-154
Author(s):  
V. Lisovenko ◽  
D. Lisovenko ◽  
O. Bazyk
Keyword(s):  
High Precision ◽  
Single Point ◽  
Dynamic Control ◽  
Directional Pattern ◽  
Current Strength ◽  
Design Parameters ◽  
Light Sources ◽  
Computer Design ◽  
Light Power ◽  
Electron Dynamic

Many energy saving tasks can be solved thanks to the current advances in LED technology in the production of semiconductor light sources. Modern production of solid-state LEDs guarantees high-precision compliance with the calculated design parameters of illumination devices. This opens up wide opportunities for high-precision control of the lighting parameters of a multicomponent module: light power, a directional pattern and a distribution of illumination. Today, the methodical issues of the preliminary modeling of LED illumination devices with the given parameters are fundamentally solved. There is a shift from manual calculations to computer design and need to develop and select the most effective mathematical modeling methods. The paper presents a consistent approach to the modeling of the distribution of illumination on a horizontal plane from the planar LED module, based on the Lambert type of radiation of a single point source. Simple mathematical expressions, programmed on a personal computer, are obtained. The example of a 25-LED floodlight has shown the ability of dynamic control the lighting characteristics of the module. Connecting patterns of separate LEDs or their groups allow to change the direction pattern of the lamp by the appropriate way of switching diodes with different aperture of radiation. The lighting power can be controlled within the linearity of the ampere-brightness characteristics by changing the current strength through the LED. The static selection of characteristics is controlled by the geometry of the location of discrete sources. The formation of uniform illumination of the plane is graphically illustrated. The electron-dynamic way of controlling the lighting parameters of the LED floodlight is confirmed by the inventor’s certificate.

scholarly journals Dispersive analysis of the Primakoff reaction $$\gamma K \rightarrow K \pi $$

2021 ◽  
Vol 81 (3) ◽  
Author(s):  
Maximilian Dax ◽  
Dominik Stamen ◽  
Bastian Kubis
Keyword(s):  
Phase Shift ◽  
High Precision ◽  
Low Energy ◽  
Wave Phase ◽  
Dispersive Analysis ◽  
Model Independent

AbstractWe provide a dispersion-theoretical representation of the reaction amplitudes $$\gamma K\rightarrow K \pi $$ γ K → K π in all charge channels, based on modern pion–kaon P-wave phase shift input. Crossed-channel singularities are fixed from phenomenology as far as possible. We demonstrate how the subtraction constants can be matched to a low-energy theorem and radiative couplings of the $$K^*(892)$$ K ∗ ( 892 ) resonances, thereby providing a model-independent framework for future analyses of high-precision kaon Primakoff data.

scholarly journals A practical approach to evaluate the measurement uncertainty budget for calibration of strain gauge based high-precision carrier frequency amplifiers

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 210
Author(s):  
Marco M. Schäck
Keyword(s):  
Measurement Uncertainty ◽  
High Precision ◽  
Strain Gauge ◽  
Carrier Frequency ◽  
Uncertainty Budget ◽  
Point Of View ◽  
Precision Measurements ◽  
Frequency Method ◽  
Physical Limit ◽  
Measurement Uncertainty Budget

For high-precision measurements of strain gauge-based transducers, 225 Hz carrier frequency measuring amplifiers are primarily used. The benefits of this carrier frequency method were discussed in previous publications. This publication shows the measurement uncertainty that can be achieved by calibrating an amplifier based on this method. Possibilities for improving the measurement uncertainty and the physical limit from the user's point of view are shown.

Digital-analog hybrid optical phase-lock loop for optical quadrature phase-shift keying

2020 ◽  
Vol 18 (9) ◽  
pp. 090602
Author(s):  
Shaowen Lu ◽  
Yu Zhou ◽  
Funan Zhu ◽  
Jianfeng Sun ◽  
Yan Yang ◽  
...  
Keyword(s):  
Phase Shift ◽  
Phase Lock Loop ◽  
Phase Shift Keying ◽  
Phase Lock ◽  
Optical Phase ◽  
Quadrature Phase Shift Keying ◽  
Quadrature Phase ◽  
Shift Keying

scholarly journals Securing ZigBee Commercial Communications Using Constellation Based Distinct Native Attribute Fingerprinting

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Christopher M. Rondeau ◽  
J. Addison Betances ◽  
Michael A. Temple
Keyword(s):  
Discriminant Analysis ◽  
Phase Shift ◽  
Rejection Rate ◽  
Phase Shift Keying ◽  
Multiple Discriminant Analysis ◽  
Network Protection ◽  
Quadrature Phase Shift Keying ◽  
Quadrature Phase ◽  
Shift Keying ◽  
Network Device

This work provides development of Constellation Based DNA (CB-DNA) Fingerprinting for use in systems employing quadrature modulations and includes network protection demonstrations for ZigBee offset quadrature phase shift keying modulation. Results are based on 120 unique networks comprised of seven authorized ZigBee RZSUBSTICK devices, with three additional like-model devices serving as unauthorized rogue devices. Authorized network device fingerprints are used to train a Multiple Discriminant Analysis (MDA) classifier and Rogue Rejection Rate (RRR) estimated for 2520 attacks involving rogue devices presenting themselves as authorized devices. With MDA training thresholds set to achieve a True Verification Rate (TVR) of TVR = 95% for authorized network devices, the collective rogue device detection results for SNR ≥ 12 dB include average burst-by-burst RRR ≈ 94% across all 2520 attack scenarios with individual rogue device attack performance spanning 83.32% < RRR < 99.81%.

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