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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">procyber</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник кибернетики</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings in Cybernetics</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">1999-7604</issn><publisher><publisher-name>Бюджетное учреждение высшего образования Ханты-Мансийского автономного округа – Югры «Сургутский государственный университет»</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">procyber-152</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКО-МАТЕМАТИЧЕСКИЕ НАУКИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Physics and Mathematics</subject></subj-group></article-categories><title-group><article-title>Неустойчивость решения задачи об определении времени падения спутников на эллиптических орбитах</article-title><trans-title-group xml:lang="en"><trans-title>Instability of Solution for Determination of Time of Satellites Falling on Elliptic Orbits</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Назаренко</surname><given-names>А. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Nazarenko</surname><given-names>A. I.</given-names></name></name-alternatives><email xlink:type="simple">anazarenko32@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Усовик</surname><given-names>И. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Usovik</surname><given-names>I. V.</given-names></name></name-alternatives><email xlink:type="simple">usovikiv@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Федеральный научный центр Научно-исследовательский институт системных исследований Российской академии наук</institution><country>Россия</country></aff><aff xml:lang="en"><institution>System Research Institute, Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2018</year></pub-date><pub-date pub-type="epub"><day>25</day><month>03</month><year>2020</year></pub-date><volume>0</volume><issue>3 (31)</issue><fpage>82</fpage><lpage>90</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Назаренко А.И., Усовик И.В., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Назаренко А.И., Усовик И.В.</copyright-holder><copyright-holder xml:lang="en">Nazarenko A.I., Usovik I.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.vestcyber.ru/jour/article/view/152">https://www.vestcyber.ru/jour/article/view/152</self-uri><abstract><p>В статье на конкретных примерах показано, что для эллиптических орбит решение задачи определения времени падения спутников может быть неустойчивым.</p></abstract><trans-abstract xml:lang="en"><p>The article considers specific examples for elliptic orbits. It is shown that the solution for determination of the time of satellites falling can be unstable.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>эллиптическая орбита</kwd><kwd>прогноз движения</kwd><kwd>вход в атмосферу</kwd></kwd-group><kwd-group xml:lang="en"><kwd>elliptic orbit</kwd><kwd>motion prediction</kwd><kwd>atmospheric entry</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнялась при поддержке Российского научного фонда, грант № 18–11–00225).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Smirnov N. N., Kiselev A. B., Nazarenko A. I. Mathematical modeling of space debris evolution in the near Earth orbits // Moscow University Mechanics Bulletin, Allerton Press. (Vestnik Moskovskogo Universiteta. Ser. 1. Matematika. Mekhanika). 2002. № 4. P. 33–41.</mixed-citation><mixed-citation xml:lang="en">Smirnov N. 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