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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">pribor</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Приборостроение</journal-title><trans-title-group xml:lang="en"><trans-title>Journal of Instrument Engineering</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0021-3454</issn><issn pub-type="epub">2500-0381</issn><publisher><publisher-name>Национальный исследовательский университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17586/0021-3454-2023-66-8-627-636</article-id><article-id custom-type="elpub" pub-id-type="custom">pribor-189</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>СИСТЕМНЫЙ АНАЛИЗ, УПРАВЛЕНИЕ И ОБРАБОТКА ИНФОРМАЦИИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>SYSTEM ANALYSIS, MANAGEMENT AND INFORMATION PROCESSING</subject></subj-group></article-categories><title-group><article-title>Адаптивный наблюдатель переменных состояния нелинейной нестационарной системы с неизвестными постоянными параметрами</article-title><trans-title-group xml:lang="en"><trans-title>Adaptive Observer of State Variables of a Nonlinear  Nonstationary System with Unknown Constant Parameters</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>Козачёк</surname><given-names>О. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kozachek</surname><given-names>O. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ольга Андреевна Козачёк — аспирант; факультет систем управления и робототехники</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Olga А. Kozachek — Post-Graduate Student;  Faculty of Control Systems and Robotics</p><p>St. Petersburg</p></bio><email xlink:type="simple">oakozachek@itmo.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>Бобцов</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Bobtsov</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Алексей Алексеевич Бобцов — д-р техн. наук, профессор;  факультет систем управления и робототехники; директор мегафакультета КТиУ</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Alexey A. Bobtsov — Dr. Sci., Professor;  Faculty of Control Systems and Robotics; Director of Mega-faculty of Computer Technologies and Control</p><p>St. Petersburg</p></bio><email xlink:type="simple">bobtsov@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>Николаев</surname><given-names>Н. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Nikolaev</surname><given-names>N. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Николай Анатольевич Николаев — канд. техн. наук, доцент, факультет систем управления и робототехники</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Nikolay A. Nikolaev — PhD, Associate Professor;  Faculty of Control Systems and Robotics</p><p>St. Petersburg</p></bio><email xlink:type="simple">nikona@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Университет ИТМО</institution></aff><aff xml:lang="en"><institution>ITMO University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>30</day><month>11</month><year>2024</year></pub-date><volume>66</volume><issue>8</issue><fpage>627</fpage><lpage>636</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Национальный исследовательский университет ИТМО, 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Национальный исследовательский университет ИТМО</copyright-holder><copyright-holder xml:lang="en">Национальный исследовательский университет ИТМО</copyright-holder><license xlink:href="https://pribor.ifmo.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://pribor.ifmo.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://pribor.ifmo.ru/jour/article/view/189">https://pribor.ifmo.ru/jour/article/view/189</self-uri><abstract><p>Предложен адаптивный наблюдатель вектора состояния нелинейной нестационарной системы по измерениям выходной переменной. Задача решена для случая, когда матрица (вектор) управления и нелинейный компонент уравнения состояния системы содержат неизвестные постоянные параметры. При синтезе наблюдателя проводится предварительная параметризация исходной нелинейной системы. Затем полученная система приводится к линейной регрессионной модели. На следующем этапе неизвестные постоянные параметры регрессии оцениваются с помощью метода наименьших квадратов с фактором забывания (forgetting factor).</p><p>Результат предыдущей работы авторов, в которой рассмотрена линейная нестационарная система, содержащая неизвестные параметры в матрице (векторе) управления, расширен на случай, когда уравнение состояния системы содержит частично неизвестную нелинейность. Работоспособность предложенного алгоритма проиллюстрирована математическим моделированием.</p></abstract><trans-abstract xml:lang="en"><p> For a nonlinear nonstationary system an adaptive state vector observer using output variable measurement is developed the control matrix (vector) and the nonlinear component of the equation of state of the system contain unknown constant parameters. When synthesizing the observer, a preliminary parametrization of the original nonlinear system is carried out. Then the derived system is reduced to a linear regression model. At the next stage, unknown constant regression parameters are estimated using the least squares method with a forgetting factor. The result of the previous work by the authors, which considered a linear non-stationary system containing unknown parameters in the control matrix (vector), is extended to the case when the equation of state of the system contains a partially unknown nonlinearity. The performance of the proposed algorithm is illustrated by mathematical modeling.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>адаптивный наблюдатель</kwd><kwd>нелинейная система</kwd><kwd>нестационарная система</kwd><kwd>линейная регрессионная модель</kwd><kwd>идентификация параметров</kwd></kwd-group><kwd-group xml:lang="en"><kwd>adaptive observer</kwd><kwd>nonlinear system</kwd><kwd>nonstationary system</kwd><kwd>linear regression model</kwd><kwd>parameters  identification</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">статья подготовлена при финансовой поддержке Российского научного фонда, грант 22-21- 00499.</funding-statement><funding-statement xml:lang="en">The article was prepared with the financial support of the Russian Science Foundation, grant  22-21-00499.</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">Каленова В. 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