scholarly journals Near earth space object detection using parallax as multi-hypothesis test criterion

2019 ◽  
Vol 27 (4) ◽  
pp. 5403
Author(s):  
Joseph Tompkins ◽  
Stephen Cain ◽  
David Becker
Keyword(s):  
Object Detection ◽  
Hypothesis Test ◽  
Space Object ◽  
Earth Space ◽  
Near Earth Space ◽  
Test Criterion

scholarly journals Structurally topological algorithm for star recognition and near-Earth space’ object detection

2020 ◽  
Vol 44 (3) ◽  
pp. 375-384
Author(s):  
I.G. Zhurkin ◽  
L.N. Chaban ◽  
P.Yu. Orlov
Keyword(s):  
Object Detection ◽  
Atmospheric Effects ◽  
Space Object ◽  
Topological Approach ◽  
Earth Space ◽  
Near Earth Space ◽  
Celestial Navigation ◽  
Set Of Points ◽  
Star Images ◽  
Star Field

When solving a variety of celestial navigation tasks there is a problem of determining parameters of spacecraft motion and onboard primary payload orientation based on the coordinates of registered star images. Furthermore, unwanted objects, like active satellites, natural and artificial space debris, that reduce the probability of correct recognition may get into the field of view of a satellite sensor. This prompts the necessity to filter out such interference from the star field images. However, if the objects under recognition are bodies located in near-Earth space, in this case, the star images themselves will act as interferences. In addition, since the detection and cataloging of these objects from the Earth’s surface is complicated by their small size, the atmospheric effects, as well as other technical difficulties, it is worthwhile to use the existing equipment onboard spacecrafts to solve this task. The existing recognition algorithms for star groups, as well as their classification, are presented in this paper. Moreover, a structurally topological approach for identifying groups of stars based on the properties of enveloping polygons used in constructing topological star patterns is proposed. Specific features in the construction of topological configurations on the analyzed set of points, as well as the principles of dynamic space object detection within their limits are described. Results of the numerical experiments performed using the developed algorithm on the star field maps and model scenes are presented.

scholarly journals Construction of a model of evolution of objects of small-sized fraction of space debris formed as a result of destruction

2021 ◽  
pp. 1-27
Author(s):  
Gennady Konstantinovich Borovin ◽  
Mikhail Vitalyevich Zakhvatkin ◽  
Victor Arkadievich Stepaniants ◽  
Igor Vyacheslavovich Usovik
Keyword(s):  
Space Debris ◽  
Time Interval ◽  
System Of Equations ◽  
Mass Ratio ◽  
Space Object ◽  
Earth Space ◽  
Near Earth Space ◽  
Statistical Estimates ◽  
Long Time ◽  
Common Understanding

The paper proposes a approach for constructing a statistical model for the distribution of a small-sized fraction of space debris in near-earth space, based on a particular model of the evolution of objects of a small-sized fraction of space debris. An algorithm for predicting the evolution of objects of small-sized fraction of space debris formed as a result of the destruction of the parent space object over a long time interval is described, as well as a system of equations in variations for mass calculations and statistical estimates of the parameters of the distribution of space debris in near-earth space. At a time interval of 10 years, calculations were carried out to obtain a common understanding of the evolution and lifetime of fragments of space debris ranging in size from 0.01 to 1 mm in the orbits of real groups and individual spacecraft. The time of existence of objects of small-sized fraction of space debris of the specified sizes depending on the parameters of the orbit and the value of their area-to-mass ratio is determined.

Beacon-satellite observations of wave disturbances in the plasma of near-earth space

2004 ◽  
Vol 10 (2-3) ◽  
pp. 16-21
Author(s):  
O.F. Tyrnov ◽  
◽  
Yu.P. Fedorenko ◽  
L.F. Chernogor ◽  
◽  
...  
Keyword(s):  
Satellite Observations ◽  
Earth Space ◽  
Near Earth Space ◽  
Wave Disturbances

scholarly journals Dynamical evolution of Oort cloud comets to near-Earth space

2006 ◽  
Vol 2 (S236) ◽  
pp. 43-54 ◽  
Author(s):  
Olga A. Mazeeva
Keyword(s):  
Dynamical Evolution ◽  
Absolute Magnitude ◽  
Oort Cloud ◽  
Outer Solar System ◽  
Earth Space ◽  
Near Earth Space ◽  
Long Period ◽  
Order Of Magnitude ◽  
Orbital Periods ◽  
Stellar Perturbations

AbstractThe dynamical evolution of 2⋅105 hypothetical Oort cloud comets by the action of planetary, galactic and stellar perturbations during 2⋅109 years is studied numerically. The evolution of comet orbits from the outer (104 AU <a<5⋅104 AU, a is semimajor axes) and the inner Oort cloud (5⋅103 AU <a<104 AU) to near-Earth space is investigated separately. The distribution of the perihelion (q) passage frequency in the planetary region is obtained calculating the numbers of comets in every interval of Δ q per year. The flux of long-period (LP) comets (orbital periods P>200 yr) with perihelion distances q<1.5 AU brighter than visual absolute magnitude H10=7 is ∼ 1.5 comets per year, and ∼18 comets with H10<10.9. The ratio of all LP comets with q<1.5 AU to ‘new’ comets is ∼5. The frequency of passages of LP comets from the inner Oort cloud through region q<1.5 AU is ∼3.5⋅10−13 yr−1, that is roughly one order of magnitude less than frequency of passages of LP comets from the outer cloud (∼5.28⋅10−12 yr−1). We show that the flux of ‘new’ comets with 15<q<31 AU is higher than with q<15 AU, by a factor ∼1.7 for comets from the outer Oort cloud and, by a factor ∼7 for comets from the inner cloud. The perihelia of comets from the outer cloud previously passed through the planetary region are predominated in the Saturn-Uranus region. The majority of inner cloud comets come in the outer solar system (q>15 AU), and a small fraction (∼0.01) of them can reach orbits with q<1.5 AU. The frequency of transfer of comets from the inner cloud (a<104 AU) to the outer Oort cloud (a>104 AU), from where they are injected to the region q<1.5 AU, is ∼6⋅10−14 yr−1.

An instrument for discrimination between orbital debris and natural particles in near-Earth space

1993 ◽  
Vol 13 (8) ◽  
pp. 133-136 ◽  
Author(s):  
A.J. Tuzzolino ◽  
J.A. Simpson ◽  
R.B. McKibben ◽  
H.D. Voss ◽  
H. Gursky
Keyword(s):  
Orbital Debris ◽  
Earth Space ◽  
Near Earth Space
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