Application of a Laser Total Station to Control the Shape of the Mirror Antenna Reflector

2021 ◽  
Author(s):  
Igor Zelinskyy ◽  
Mykhaylo Palamar ◽  
Myroslava Yavorska
Keyword(s):  
Total Station ◽  
Mirror Antenna ◽  
Antenna Reflector

Effect of climatic factors on energy loss of millimeter range electromagnetic wave in passing through a precipitation layer on the mirror antenna reflector

2021 ◽  
Author(s):  
M.Yu. Zvezdina ◽  
A.M. Shaposhnikova ◽  
Yu.A. Shokova
Keyword(s):  
Wavelength Range ◽  
Relative Permittivity ◽  
Climatic Factors ◽  
Electromagnetic Energy ◽  
Reflection Factor ◽  
Energy Losses ◽  
Electrical Parameters ◽  
Millimeter Wavelength ◽  
Mirror Antenna ◽  
Antenna Reflector

Problem statement. Communication systems transition to the millimeter wavelength range, as well as known theoretical studies on higher electromagnetic energy losses in precipitation in this range compared with the centimeter range have necessitated a scientific justification of an antenna protection method against climatic factors. This makes the chosen research topic relevant. Objective. Analysis of the climatic factors effect on the electromagnetic energy losses in the precipitation layer on the reflector of the millimeter wave range mirror antenna. Results. It is shown that the estimation of electromagnetic energy losses in the precipitation layer on the metal reflector of the mirror antenna should be carried out with the use of the basic statements of meteorological electromagnetism, which unites the statements of electrodynamics and statistical meteorology. Thus, to estimate the electromagnetic energy losses in the precipitation layer on the metal reflector of the millimeter wavelength reflector antenna, the model of the flat multi-layer dielectric coating on the metal screen can be used, which allows to relate the reflection factor to the layer parameters: the electrical parameters of the precipitation (value of the relative permittivity and the tangent angle of dielectric losses) and the layer thickness. Analysis of the known methods of finding the electrical parameters of meteorological precipitation showed that, firstly, it is difficult to measure the imaginary component of the relative permittivity of rain, ice, and snow in the millimeter frequency range. Secondly, there is no approved calculation methodology for the electrical parameters of snow, and the known models depend on random factors - the specific density of snow at the time of measurement and the electrical parameters of the ice and water that make up the snow and their concentrations. Third, finding the electrical characteristics of any type of precipitation characteristic of a given location of the mirror antenna depends on the air temperature. To justify the thickness of precipitation layer on the antenna reflector, the following statistical data are also necessary: the intensity of rain in a given location with a given probability, the daily rate of snow layer and the thickness of ice, which can form in a given climatic region on the metal elements of the mirror structure, including the reflector. Obtained results of electromagnetic energy losses in precipitation layer for different cases of meteorological conditions for millimeter band and their comparison with data for centimeter wavelength range have shown that the greatest losses (from 12-13 dB to 92 dB) in millimeter wavelength range, especially at frequencies above 60 GHz are caused by snow precipitation. In the centimeter wavelength range the maximum losses (up to 10 dB) can be observed in rain.

Choice of Optimum Operational Regime for Total Stations upon Making Geodetic Surveys under Heavy Aerosol Atmosphere Pollution

2018 ◽  
Vol 938 (8) ◽  
pp. 12-19
Author(s):  
S. B. Verdiyev
Keyword(s):  
Rational Choice ◽  
Theoretical Modelling ◽  
Total Station ◽  
Visible Band ◽  
Multi Wavelength ◽  
Atmosphere Pollution ◽  
Experimental Researches ◽  
Practical Recommendations

The possibility to use multi-wavelength regime of total stations operation for making surveys under heavy aerosol atmosphere pollution is researched. The actuality of single- and multi-wavelength regimes rational choice under heavy aerosol atmosphere pollution is grounded. The task on researching the matter of operational regime choice for total stations is formulated. The method for solution of the formulated task is suggested. The theoretical modelling and experimental researches are held to formulate the criterion for choice of single- or multi-wavelength regimes. The practical recommendations for such a choice are formulated. The practical recommendations are formulated for choice of measurements regime. According to formulated recommendations if a single-wavelength total station operates in the field of longer wavelengths (R) of visible band and a three-wavelengths one operates with bias to shorter (B, G, R) wavelengths, the single-wavelength total station should be preferred. But if the single-wavelength total station operates in the field of shorter wavelengths (B) and the three-wavelengths one operates with bias to longer wavelengths (B, G, R) then the multi-wavelengths total station should be preferred. The recommendation described in this article are relevant for both the regimes of measurements with- and without reflector and can be useful for users of total stations.

scholarly journals An approach to design of large-sized deployable hoop space antenna reflector

2021 ◽  
Vol 1902 (1) ◽  
pp. 012125
Author(s):  
V Ye Meshkovsky ◽  
A N Sdobnikov ◽  
Yu A Kisanov
Keyword(s):  
Space Antenna ◽  
Antenna Reflector

Establishment of geodetic control network for Quy Nhon University area

2021 ◽  
Vol 15 (1) ◽  
pp. 61-73
Author(s):  
Quang Hien Truong ◽  
◽  
Anh Tu Ngo ◽  
Thi Hien Cu ◽  
◽  
...  
Keyword(s):  
Natural Resources ◽  
Research Result ◽  
Bench Mark ◽  
Control Network ◽  
Total Station ◽  
Network Diagram ◽  
Specialized Software ◽  
General Plan ◽  
Geodetic Control ◽  
The University

Geodetic control network of Quy Nhon University (QNU) is established based on GNSS technology and electronic total station technology in combination with the middle geometrical elevation surveying method, bench mark of network built with firm concrete installed with a centralized insulator cap. The network consists of 11 points, of which 2 points are traversed from the cadastral point of class I, used as the starting points for the traverse. The network is built based on total station method with 2 turns of forward and backward surveying. The network’s leveling height is measured by the middle geometrical elevation surveying method, ensuring compliance with the procedures and rules of the Ministry of Natural Resources and Environment. The research result includes a system of stable and solid network points, together with the coordinates and the leveling height that are closely adjusted by specialized software, control network diagram. Geodetic control network of the QNU is important in setting up map, general plan, planning, construction and serving for teaching and scientific research of the university.

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