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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">RUDN Journal of Engineering Research</journal-id><journal-title-group><journal-title xml:lang="en">RUDN Journal of Engineering Research</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Российского университета дружбы народов. Серия: Инженерные исследования</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2312-8143</issn><issn publication-format="electronic">2312-8151</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">44848</article-id><article-id pub-id-type="doi">10.22363/2312-8143-2025-26-1-17-27</article-id><article-id pub-id-type="edn">JTTEWC</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Development of a Time Domain Identification Algorithm with a Spectral Objective Function</article-title><trans-title-group xml:lang="ru"><trans-title>Разработка алгоритма идентификации во временной области со спектральной целевой функцией</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3926-1024</contrib-id><contrib-id contrib-id-type="spin">2472-6853</contrib-id><name-alternatives><name xml:lang="en"><surname>Korsun</surname><given-names>Oleg N.</given-names></name><name xml:lang="ru"><surname>Корсун</surname><given-names>Олег Николаевич</given-names></name></name-alternatives><bio xml:lang="en"><p>Doctor of Technical Sciences, Head of the Scientific and Educational Center, State Scientific Research Institute of Aviation Systems; Professor, Department of Design and Certification of Aircraft Engineering, Moscow Aviation Institute (National Research University)</p></bio><bio xml:lang="ru"><p>доктор технических наук, руководитель научно-образовательного центра, Государственный научно-исследовательский институт авиационных систем; профессор кафедры проектирования и сертификации авиационной техники, Московский авиационный институт (Национальный исследовательский университет)</p></bio><email>marmotto@rambler.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7770-2962</contrib-id><name-alternatives><name xml:lang="en"><surname>Om</surname><given-names>Moung Htang</given-names></name><name xml:lang="ru"><surname>Ом</surname><given-names>Моунг Хтанг</given-names></name></name-alternatives><bio xml:lang="en"><p>Ph.D. in Technical Sciences, Post-doctoral Candidate, Department of Design and Certification of Aircraft Engineering</p></bio><bio xml:lang="ru"><p>кандидат технических наук, докторант кафедры проектирования и сертификации авиационной техники</p></bio><email>mounghtangom50@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">State Scientific Research Institute of Aviation Systems</institution></aff><aff><institution xml:lang="ru">Государственный научно-исследовательский институт авиационных систем</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Moscow Aviation Institute (National Research University)</institution></aff><aff><institution xml:lang="ru">Московский авиационный институт (Национальный исследовательский университет)</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-06-02" publication-format="electronic"><day>02</day><month>06</month><year>2025</year></pub-date><volume>26</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>17</fpage><lpage>27</lpage><history><date date-type="received" iso-8601-date="2025-07-04"><day>04</day><month>07</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Korsun O.N., Om M.H.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Корсун О.Н., Ом М.Х.</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Korsun O.N., Om M.H.</copyright-holder><copyright-holder xml:lang="ru">Корсун О.Н., Ом М.Х.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/engineering-researches/article/view/44848">https://journals.rudn.ru/engineering-researches/article/view/44848</self-uri><abstract xml:lang="en"><p>A reliable method has been developed for identifying aerodynamic coefficients and systematic errors in the aircraft measuring system, using the advantages of frequency domain analysis. The parameter identification problem is formulated using maximum likelihood estimation method. The models of object and observation are formulated in time domain and the objective function is defined in frequency domain that is able to decouple the aircraft’s response at different frequencies, effectively mitigating the impact of noise and potential non-linearities inherent in time-domain data. This transformation from time domain to frequency domain also facilitates the identification of delays in measurement system, which are often difficult to estimate accurately in the time domain. A modified Newton’s method is employed to efficiently minimize the objective function in frequency domain, yielding optimal estimates for the lateral aerodynamic derivatives and delays. The effectiveness of this approach is validated through examples of identifying the parameters of a flight vehicle motion model, demonstrating its capability to accurately characterize lateral aircraft dynamics. This method provides a valuable tool for enhancing flight control system design and analysis by enabling more precise modeling of aircraft behavior.</p></abstract><trans-abstract xml:lang="ru"><p>Разработан надежный метод определения аэродинамических коэффициентов и систематических ошибок в измерительной системе самолета, в котором используются преимущества анализа в частотной области. Задача определения параметров формулируется в рамках метода максимума правдоподобия. Модели объекта и наблюдения задаются во временной области, а функционал определяется в частотной области, что позволяет разделить динамические характеристики самолета на разных частотах, эффективно уменьшая влияние шума и потенциальных нелинейностей, присущих данным во временной области. Этот переход из временной области в частотную также облегчает определение задержек в измерительной системе, которые часто сложно точно оценить во временной области. Для минимизации целевой функции в частотной области применяется модифицированный метод Ньютона, что позволяет получить оптимальные оценки боковых аэродинамических коэффициентов и запаздываний. Эффективность данного подхода подтверждается примерами идентификации параметров модели движения летательного аппарата, демонстрируя его способность точно охарактеризовать боковую динамику самолета. Этот метод может стать эффективным инструментом для оптимизации проектирования и анализа систем управления полетом. Он дает возможность с высокой точностью моделировать поведение летательного аппарата.</p></trans-abstract><kwd-group xml:lang="en"><kwd>parameter identification</kwd><kwd>time-spectral algorithm</kwd><kwd>frequency domain</kwd><kwd>aerodynamic coefficients</kwd><kwd>on-board measurement errors</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>идентификация параметров</kwd><kwd>спектрально-временной алгоритм</kwd><kwd>частотная область</kwd><kwd>аэродинамические коэффициенты</kwd><kwd>погрешности бортовых измерений</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Klein V, Morelli EA. Aircraft System Identification: Theory and Practice. Reston: AIAA. 2006.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Jategaonkar RV. Flight Vehicle System Identification: A Time Domain Methodology. 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