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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="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Journal of Communications Technology and Electronics</journal-id><journal-title-group><journal-title xml:lang="en">Journal of Communications Technology and Electronics</journal-title><trans-title-group xml:lang="ru"><trans-title>Радиотехника и электроника</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0033-8494</issn><issn publication-format="electronic">3034-5901</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">650573</article-id><article-id pub-id-type="doi">10.31857/S0033849423030154</article-id><article-id pub-id-type="edn">IDSVEA</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>СТАТИСТИЧЕСКАЯ РАДИОФИЗИКА</subject></subj-group><subj-group subj-group-type="article-type"><subject>Unknown</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Density Parameters of the Probability Distribution of Fluctuations of the Apparent Center of Radiation from the Helicopter Propeller Bushing during its Radar Observation</article-title><trans-title-group xml:lang="ru"><trans-title>Параметры плотности распределения вероятности флуктуаций кажущегося центра излучения от втулки винта вертолета при ее радиолокационном наблюдении</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Stepanov</surname><given-names>M. A.</given-names></name><name xml:lang="ru"><surname>Степанов</surname><given-names>М. А.</given-names></name></name-alternatives><email>m.stepanov@corp.nstu.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Novosibirsk State Technical University</institution></aff><aff><institution xml:lang="ru">Новосибирский государственный технический университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-03-01" publication-format="electronic"><day>01</day><month>03</month><year>2023</year></pub-date><volume>68</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>256</fpage><lpage>262</lpage><history><date date-type="received" iso-8601-date="2025-01-31"><day>31</day><month>01</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, М.А. Степанов</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, М.А. Степанов</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">М.А. Степанов</copyright-holder><copyright-holder xml:lang="ru">М.А. Степанов</copyright-holder></permissions><self-uri xlink:href="https://innoscience.ru/0033-8494/article/view/650573">https://innoscience.ru/0033-8494/article/view/650573</self-uri><abstract xml:lang="en"><p>The properties of angular noise of radar reflections from the rotor head are considered. On the basis of a multipoint geometric model of the rotor head, analytical expressions are obtained that allow calculating the parameters of the probability distribution density of angular noise for the azimuth planes and the elevation of the rotor head of a single-bladed screw at an undirected angle of the control sleeve. Correlation obtained for one blade rotor head is generalized to thease of a rotor head with an arbitrary number of blades. It is shown that the rotor head angular noise is a random process with periodically changing parameters. The theoreticalresults are confirmed by mathematical modeling.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45181323299456">Рассмотрены свойства угловых шумов радиолокационных отражений от втулки винта. На основе многоточечной геометрической модели втулки винта получены аналитические выражения, позволяющие рассчитать параметры плотности распределения вероятности угловых шумов для плоскостей азимут и угол места для втулки однолопастного винта при произвольном угле поворота втулки. Соотношения, полученные для втулки с одной лопастью, обобщены на случай втулки винта с произвольным количеством лопастей. Показано, что угловой шум втулки представляет собой случайный процесс с периодически изменяющимися параметрами. Теоретические результаты подтверждены математическим моделированием.</p></trans-abstract><kwd-group xml:lang="en"><kwd>rotor head</kwd><kwd>probability distribution density</kwd><kwd>angular noise</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Sisle M.E., McCarthy E.D. // Simulation. 1982. V. 39. № 5. P. 159.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Sabitov T., Kiselev A., Stepanov M., Oreshkina M. // Remote Sensing Lett. 2021. V. 12. № 11. P. 1082.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Sayama H. Introduction to the Modeling and Analysis of Complex Systems. Ceneseo: Open SUNY Texbooks, 2015.</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Zuo L., Li M., Zhang X-W., Wuet Y. // IET Radar, Sonar and Navigation. 2013. V. 7. № 3. 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