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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">dan</journal-id><journal-title-group><journal-title xml:lang="ru">Доклады Национальной академии наук Беларуси</journal-title><trans-title-group xml:lang="en"><trans-title>Doklady of the National Academy of Sciences of Belarus</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-8323</issn><issn pub-type="epub">2524-2431</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-8323-2021-65-1-18-24</article-id><article-id custom-type="elpub" pub-id-type="custom">dan-940</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>МАТЕМАТИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MATHEMATICS</subject></subj-group></article-categories><title-group><article-title>Стационарные орбиты линейных нестационарных систем наблюдения</article-title><trans-title-group xml:lang="en"><trans-title>Stationary orbits of linear time-varying observation systems</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>Астровский</surname><given-names>А. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Astrovskii</surname><given-names>A. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Астровский Анатолий Иванович – д-р физ.-мат. наук, профессор</p><p>Партизанский пр., 26, 220070, Минск</p><p> </p></bio><bio xml:lang="en"><p>Astrovskii Anatoly I. – D. Sc. (Physics and Mathematics), Professor  </p><p>26, Partizanskii Ave., 220070, Minsk</p></bio><email xlink:type="simple">aastrov@tut.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный экономический университет</institution></aff><aff xml:lang="en"><institution>Belarus State Economic Univesity</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>22</day><month>02</month><year>2021</year></pub-date><volume>65</volume><issue>1</issue><fpage>18</fpage><lpage>24</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Астровский А.И., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Астровский А.И.</copyright-holder><copyright-holder xml:lang="en">Astrovskii A.I.</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://doklady.belnauka.by/jour/article/view/940">https://doklady.belnauka.by/jour/article/view/940</self-uri><abstract><p>Для линейных нестационарных систем наблюдения со скалярным выходом доказаны необходимые и достаточные условия, при выполнении которых исходную систему наблюдения можно преобразовать к стационарному виду с помощью группы линейных нестационарных дифференцируемых преобразований. Указан полный инвариант действия группы преобразований на множестве равномерно наблюдаемых систем. Описан конструктивный алгоритм построения эквивалентной стационарной системы для заданной линейной нестационарной системы наблюдения.</p></abstract><trans-abstract xml:lang="en"><p>In terms of matrix observability, the necessary and sufficient conditions are obtained for the linear timevarying observation system to have stationary orbits with respect to the linear time-varying transformation group of class C1 . The full invariant of the action of a transformation group is described. It is proved that for any matrix function A c C(T, Rn×n ), there exists such an n-vector function c(t), t c T, that the pair (A, c) is uniformly observable. The algorithm for constructing a stationary system is described.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>линейная нестационарная система наблюдения</kwd><kwd>равномерная наблюдаемость</kwd><kwd>группа преобразований</kwd><kwd>стационарная система</kwd><kwd>приводимость</kwd><kwd>полные инварианты</kwd></kwd-group><kwd-group xml:lang="en"><kwd>linear time-varying observation system</kwd><kwd>uniform observability</kwd><kwd>transformation group</kwd><kwd>stationary system</kwd><kwd>reducible system</kwd><kwd>full invariants</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Ляпунов, А. М. Общая задача об устойчивости движения / А. М. Ляпунов. – М.: ГИТТЛ, 1950. – 472 с.</mixed-citation><mixed-citation xml:lang="en">Lyapunov A. M. On general problem of stability motion. Moscow, GITTL Publ., 1950. 472 p. 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