scholarly journals The use of digital data processing to improve the metrological characteristics of the rubidium frequency standard

2021 ◽  
Vol 2086 (1) ◽  
pp. 012070
Author(s):  
A P Valov ◽  
K G Arinushkina ◽  
V V Davydov ◽  
V Yu Rud
Keyword(s):  
Communication Systems ◽  
Satellite Communication ◽  
Experimental Studies ◽  
Digital Processing ◽  
Frequency Standard ◽  
Metrological Characteristics ◽  
Digital Data ◽  
Quantum Frequency ◽  
Quantum Frequency Standard ◽  
Digital Data Processing

Abstract The necessity of improving the metrological characteristics of a quantum frequency standard when determining the coordinates of an object on the Earth’s surface or long-term transmission of large amounts of data in satellite communication systems is substantiated. A new algorithm for digital processing of optical signals in the frequency standard is proposed. The results of experimental studies of the metrological characteristics of a quantum frequency standard based on rubidium atoms - 87 are presented

scholarly journals Метод трансляционного переноса для оценки стабильности нестационарного квантового стандарта частоты

2021 ◽  
Vol 91 (1) ◽  
pp. 32
Author(s):  
С.В. Божокин ◽  
К.А. Баранцев ◽  
А.Н. Литвинов
Keyword(s):  
Wavelet Transform ◽  
Continuous Wavelet Transform ◽  
Frequency Standard ◽  
Continuous Wavelet ◽  
Quantum Frequency ◽  
Quantum Frequency Standard ◽  
Standard Signal ◽  
Wavelet Variance ◽  
Non Stationary Signal

Continuous wavelet transform is used to analyze the operation of a non-stationary signal of a quantum frequency standard. The method of translational transfer is proposed, with the help of which the boundary phenomena in this transformation are eliminated. The spectral integrals of the quantum frequency standard signal in various frequency ranges are calculated. A wavelet dispersion is introduced, which makes it possible to determine the moments of time when the signal fluctuations are the strongest. The comparison of the wavelet variance with the usual variance and with the Allen variance is carried out.

Human Factors Engineering Aspects of Satellite Communication Systems

1974 ◽  
Vol 18 (5) ◽  
pp. 604-623 ◽  
Author(s):  
James W. Kuhr ◽  
Leonard W. Tobias
Keyword(s):  
Human Factors ◽  
Communication Systems ◽  
Satellite Communication ◽  
System Development ◽  
Digital Data ◽  
Human Factors Engineering ◽  
Test And Evaluation ◽  
Function Allocation ◽  
Future System ◽  
Military Procurement

Development of satellite communication systems for military use involves human factors engineering in such new areas as digital data handling and computer assistance, besides the well-known areas: function allocation, task analysis, control and display arrangement, workplace layout and personnel subsystem test and evaluation. This paper deals with contributions made during definition, design and verification of the Air Force Satellite Communication System and associated Navy and Army versions. The description of system development provides an up-to-date case study of human factors engineering problems in a military procurement setting. Recommendations are made concerning future system planning.

scholarly journals Susceptibility of surface texture parameters to acquisition point clouds with digital data processing of data from optical measuring systems

2019 ◽  
Vol 252 ◽  
pp. 03020 ◽  
Author(s):  
Emilia Bachtiak-Radka ◽  
Sara Dudzińska ◽  
Daniel Grochała ◽  
Stefan Berczyński
Keyword(s):  
Data Processing ◽  
Surface Texture ◽  
Surface Characteristics ◽  
Point Clouds ◽  
Digital Processing ◽  
Digital Data ◽  
Measuring Systems ◽  
Optical Measuring ◽  
Digital Data Processing ◽  
The Impact

Digital processing of the recorded point clouds on innovative surfaces could facilitate the operator’s planning of the metrological process and give more freedom in the assessment of the surface texture. The current state of knowledge about surface characteristics, precision and quality of measurements and especially the repeatability of measurements – not only in the laboratory environment but also in the industry pose a big challenge. The paper presents research works related to the identification of the impact of the method of acquisition point clouds using digital data processing on surface texture. The main assumption of the paper was to carry out, according to the prepared plan of the experiment, the series of sample measurements with the use of the optical measuring systems AltiSurf A520 in the Laboratory of Surface Topography at the West Pomeranian University of Technology in Szczecin. The next task was to determine the impact of the digital data processing strategy in order to identify the significance of the impact (conditions and methods of filtration), which in practice largely determines the repeatability and reproducibility of the parameter values of the geometry surface structure.

scholarly journals Data-Aided Carrier Recovery with QPSK Modulation

2019 ◽  
Vol 24 (1) ◽  
pp. 14-22
Author(s):  
Muhanned Al-Rawi
Keyword(s):  
Data Transmission ◽  
Communication Systems ◽  
Satellite Communication ◽  
Digital Communication ◽  
Design Tool ◽  
Digital Data ◽  
Carrier Recovery ◽  
Coherent Demodulation ◽  
Tool Performance ◽  
Shift Keying

Abstract Digital communication has proven to be the most efficient method of data transmission especially where long distances are involved. This led to the invention of more sophisticated methods of communication ranging from mobile handset communication to more advanced satellite communication. The speeds of passing information have been improving over the years and real time video communication has been made possible with digital devices. Various methods of digital data transmission are employed based on the information to be transmitted. This paper focuses on carrier recovery in digital communication systems, especially those based on Quadrature Phase Shift Keying (QPSK) modulation and demodulation scheme. The design being implemented is that of coherent demodulation for QPSK scheme using SIMULINK design tool. Performance of QPSK is also investigated to make a comparison and the suitability of the scheme to use in digital data transmission applications.

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