Increasing frequency stability and accuracy in methane e-component lasers

1991 ◽  
Vol 34 (6) ◽  
pp. 581-584
Author(s):  
A. N. Titov ◽  
Yu. G. Rastorguev
Keyword(s):  
Frequency Stability ◽  
Stability And Accuracy

Design of the High-Speed X-Band Frequency Hopping Source

2014 ◽  
Vol 662 ◽  
pp. 231-234
Author(s):  
Shuang Zhao ◽  
Dian Ren Chen
Keyword(s):  
High Speed ◽  
Frequency Hopping ◽  
Frequency Stability ◽  
Band Frequency ◽  
X Band ◽  
Frequency Source ◽  
The Stability ◽  
Stability And Accuracy ◽  
Low Phase Noise ◽  
Communication Equipment

In modern communication system, the spacing of channel becomes ever more finely. For communication equipment, it has made ​​high demands on the stability and accuracy of the frequency. Based on DDS technology, combined with the multiplier circuit, we developed a high-speed X-band frequency hopping source. Experimental results show that this frequency source is with excellent frequency stability and low phase noise.

Computer modeling of parametric converters with frequency and phase control

2020 ◽  
pp. 96-106
Author(s):  
В.В. Иванов ◽  
Я.В. Еремина ◽  
С.В. Ермолова
Keyword(s):  
Mathematical Modeling ◽  
Computer Modeling ◽  
Digital Filters ◽  
High Sensitivity ◽  
Frequency Stability ◽  
Phase Control ◽  
Operational Parameters ◽  
Conversion Characteristic ◽  
Aerospace Systems ◽  
Stability And Accuracy

Осуществлено математическое моделирование параметрических преобразователей, использующих режим повышенной чувствительности. Названный режим преобразователей позволяет повысить эксплуатационные показатели аппаратуры авиационно-космических систем. Показано, что преобразователи с фазовым управлением обладают линейными характеристиками и являются более перспективны. Применение в них цифровых фильтров ведет к повышению стабильности частоты и точности настройки, а также минимизируется погрешность характеристики преобразования. Mathematical modeling of parametric converters using high-sensitivity mode is carried out. The named mode of converters allows to increase operational parameters of the equipment of aerospace systems. It is shown that phase-controlled converters are more promising because they have linear characteristics and allow the use of digital filters, which leads to an increase in frequency stability and accuracy of adjustment, and also minimizes the error of the conversion characteristic.

scholarly journals Current and future realizations of coordinate time scales

2009 ◽  
Vol 5 (S261) ◽  
pp. 95-101
Author(s):  
E. Felicitas Arias
Keyword(s):  
Time Scales ◽  
Time Scale ◽  
Proper Time ◽  
Frequency Stability ◽  
Reference Time ◽  
Weights And Measures ◽  
Coordinate Time ◽  
Future Improvement ◽  
Stability And Accuracy ◽  
Atomic Time

AbstractTwo atomic time scales maintained at the International Bureau of Weights and Measures (BIPM) are realizations of terrestrial time: International Atomic Time (TAI) and TT(BIPM). They are calculated from atomic clocks realizing proper time in national laboratories. The algorithm for the calculation of TAI has been designed to optimize the frequency stability and accuracy of the time scale. Plans for the future improvement of the reference time scales are presented.

scholarly journals LNG Tank Sloshing Simulation of Multidegree Motions Based on Modified 3D MPS Method

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Chunhui Wang ◽  
Chunyu Guo ◽  
Fenglei Han
Keyword(s):  
Free Surface ◽  
Weighted Average ◽  
Kernel Functions ◽  
Computational Stability ◽  
Mps Method ◽  
Fluid Sloshing ◽  
Particle Hydrodynamics ◽  
Moving Particle ◽  
Lng Tank ◽  
Stability And Accuracy

Modified 3D Moving Particle Semi-Implicit (MPS) method is used to complete the numerical simulation of the fluid sloshing in LNG tank under multidegree excitation motion, which is compared with the results of experiments and 2D calculations obtained by other scholars to verify the reliability. The cubic spline kernel functions used in Smoothed Particle Hydrodynamics (SPH) method are adopted to reduce the deviation caused by consecutive two times weighted average calculations; the boundary conditions and the determination of free surface particles are modified to improve the computational stability and accuracy of 3D calculation. The tank is under forced multidegree excitation motion to simulate the real conditions of LNG ships, the pressures and the free surfaces at different times are given to verify the accuracy of 3D simulation, and the free surface and the splashed particles can be simulated more exactly.

scholarly journals Underground Microseismic Event Monitoring and Localization within Sensor Networks

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2830
Author(s):  
Sili Wang ◽  
Mark P. Panning ◽  
Steven D. Vance ◽  
Wenzhan Song
Keyword(s):  
Sensor Networks ◽  
Real Time ◽  
Information Needs ◽  
Localization Algorithm ◽  
Distributed Sensors ◽  
Distributed Sensor ◽  
Microseismic Events ◽  
The Stability ◽  
Stability And Accuracy

Locating underground microseismic events is important for monitoring subsurface activity and understanding the planetary subsurface evolution. Due to bandwidth limitations, especially in applications involving planetarily-distributed sensor networks, networks should be designed to perform the localization algorithm in-situ, so that only the source location information needs to be sent out, not the raw data. In this paper, we propose a decentralized Gaussian beam time-reverse imaging (GB-TRI) algorithm that can be incorporated to the distributed sensors to detect and locate underground microseismic events with reduced usage of computational resources and communication bandwidth of the network. After the in-situ distributed computation, the final real-time location result is generated and delivered. We used a real-time simulation platform to test the performance of the system. We also evaluated the stability and accuracy of our proposed GB-TRI localization algorithm using extensive experiments and tests.

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