The speckle-interferometric images modelling of artificial Earth satellites in problems of near-Earth astronomy

Abstract The article represents the results of efficiency estimation for perspective observation facilities of near-Earth astronomy in terms of the AES (artificial Earth’s satellite) optical images obtaining and quality. A mathematical method for modeling optical images based on the induced virtual environment is proposed . A speckle interferometric image registration scheme and bispectral processing are reviewed. Upon modelling, the real speckle interferometric images of stars have been used as scattering functions; the AES orbits and geometry have been set in reliance on the real AES orbits and 3D-shapes. Additionally, photon and readout noises have been modelled. A large set of different variants of the AES orbits and 3D-shapes is reviewed.Anon-linear distortion problem is analyzed. The modelling has been performed under various atmosphere turbulence conditions (2”, 4”). The following characteristics have been estimated: number of frames to accumulate depending on the AES orbit and shape, noise intensity, type and parameters of bispectral processing, energy characteristics.

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Comparative assessment of models for determining the wet component of the atmospheric correction in the distance to artificial earth satellites

Scientific Herald of Uzhhorod University Series Physics ◽

10.24144/2415-8038.1999.5.92-98 ◽

1999 ◽

Vol 5 (0) ◽

pp. 92-98

Author(s):

І. М. Тегза

Keyword(s):

Atmospheric Correction ◽

Comparative Assessment ◽

Artificial Earth Satellites ◽

Artificial Earth

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OBSERVATIONS OF ARTIFICIAL EARTH SATELLITES IN UZHGOROD UNIVERSITY: APPLIED AND FUNDAMENTAL ASPECTS

Scientific Herald of Uzhhorod University Series Physics ◽

10.24144/2415-8038.2000.6.98-112 ◽

2000 ◽

Vol 6 (0) ◽

pp. 98-112

Author(s):

М. В. Братійчук ◽

А. Г. Кириченко ◽

В. П. Єпішев

Keyword(s):

Artificial Earth Satellites ◽

Artificial Earth

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General relativistic effects acting on the orbits of Galileo satellites

Celestial Mechanics and Dynamical Astronomy ◽

10.1007/s10569-021-10014-y ◽

2021 ◽

Vol 133 (4) ◽

Author(s):

K. Sośnica ◽

G. Bury ◽

R. Zajdel ◽

K. Kazmierski ◽

J. Ventura-Traveset ◽

...

Keyword(s):

General Relativity ◽

Orbit Determination ◽

Final Height ◽

Precise Orbit Determination ◽

Satellite System ◽

De Sitter ◽

Circular Orbits ◽

Precise Orbit ◽

Artificial Earth Satellites ◽

Artificial Earth

AbstractThe first pair of satellites belonging to the European Global Navigation Satellite System (GNSS)—Galileo—has been accidentally launched into highly eccentric, instead of circular, orbits. The final height of these two satellites varies between 17,180 and 26,020 km, making these satellites very suitable for the verification of the effects emerging from general relativity. We employ the post-Newtonian parameterization (PPN) for describing the perturbations acting on Keplerian orbit parameters of artificial Earth satellites caused by the Schwarzschild, Lense–Thirring, and de Sitter general relativity effects. The values emerging from PPN numerical simulations are compared with the approximations based on the Gaussian perturbations for the temporal variations of the Keplerian elements of Galileo satellites in nominal, near-circular orbits, as well as in the highly elliptical orbits. We discuss what kinds of perturbations are detectable using the current accuracy of precise orbit determination of artificial Earth satellites, including the expected secular and periodic variations, as well as the constant offsets of Keplerian parameters. We found that not only secular but also periodic variations of orbit parameters caused by general relativity effects exceed the value of 1 cm within 24 h; thus, they should be fully detectable using the current GNSS precise orbit determination methods. Many of the 1-PPN effects are detectable using the Galileo satellite system, but the Lense–Thirring effect is not.

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