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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">10.17586/0021-3454-2025-68-5-397-405</article-id><article-id custom-type="elpub" pub-id-type="custom">pribor-371</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>Синтез адаптивного наблюдателя состояния для класса нестационарных билинейных систем в условиях частичной параметрической неопределенности</article-title><trans-title-group xml:lang="en"><trans-title>Adaptive state observer synthesis for a class of nonstationary bilinear systems under conditions of partial parametric uncertainty</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>О. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ольга Андреевна Козачёк — аспирант, факультет систем робототехники и управления</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Olga A. Kozachek — Post-Graduate Student, Faculty of Robotic Systems and Control</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 робототехники и управления</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Alexey A. Bobtsov — Dr. Sci., Professor, Faculty of Robotic Systems 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-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>2025</year></pub-date><pub-date pub-type="epub"><day>09</day><month>06</month><year>2025</year></pub-date><volume>68</volume><issue>5</issue><fpage>397</fpage><lpage>405</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Национальный исследовательский университет ИТМО, 2025</copyright-statement><copyright-year>2025</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/371">https://pribor.ifmo.ru/jour/article/view/371</self-uri><abstract><p>Предложен адаптивный наблюдатель для билинейной нестационарной динамической системы в условиях частичной параметрической неопределенности. Задача решается в предположении, что неизвестные параметры содержатся в матрице/векторе при сигнале управления. Ключевая идея предложенного алгоритма состоит в новой параметризации объекта, которая основана на двух функциях, одну из которых можно найти аналитически, используя известные и измеряемые сигналы системы. Применение линейных фильтров позволяет привести систему к виду линейной статической регрессионной модели, содержащей неизвестные постоянные параметры; на следующем этапе неизвестные параметры оцениваются с помощью градиентного алгоритма. Так как неизвестные постоянные параметры математически связаны с неизвестными начальными условиями вектора состояния и неизвестными переменными параметрами в матрице/векторе управления, то на основе полученных оценок выведены оценки неизвестных компонент вектора состояния и оценка неизвестного параметра. Показано преимущество предложенного метода, состоящее в возможности его применения к достаточно широкому классу билинейных систем, к которым, в частности, могут быть сведены системы Эйлера — Лагранжа, описывающие множество реальных технических объектов и робототехнических систем.</p></abstract><trans-abstract xml:lang="en"><p>An adaptive observer for a bilinear nonstationary dynamic system under partial parametric uncertainty is proposed. The problem is solved under the assumption that the unknown parameters are contained in the matrix/ vector at the control signal. The key idea of the proposed algorithm is a new parameterization of the object based on two functions, one of which can be found analytically using the known and measured signals of the system. The use of linear filters allows us to reduce the system to the form of a linear static regression model containing unknown constant parameters; at the next stage, the unknown parameters are estimated using a gradient algorithm. Since the unknown constant parameters are mathematically related to the unknown initial conditions of the state vector and the unknown variable parameters in the matrix/vector of control, the estimates of the unknown components of the state vector and the estimate of the unknown parameter are derived based on the estimates obtained. It is shown that the proposed method advantage consists in the possibility of application to a sufficiently wide class of bilinear systems, to which, in particular, Euler-Lagrange systems describing many real technical objects and robotic systems can be reduced.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>билинейная система</kwd><kwd>нестационарная система</kwd><kwd>адаптивный наблюдатель</kwd><kwd>идентификация параметров</kwd><kwd>линейная регрессионная модель</kwd></kwd-group><kwd-group xml:lang="en"><kwd>bilinear system</kwd><kwd>time-varying system</kwd><kwd>adaptive observer</kwd><kwd>parameters identification</kwd><kwd>linear regression model</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено при поддержке Министерства науки и высшего образования Российской Федерации, проект № FSER-2025-0002</funding-statement><funding-statement xml:lang="en">Тhe study was carried out with the support of the Ministry of Science and Higher Education of the Russian Federation (project no. 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