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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">izmertech</journal-id><journal-title-group><journal-title xml:lang="ru">Измерительная техника</journal-title><trans-title-group xml:lang="en"><trans-title>Izmeritel`naya Tekhnika</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0368-1025</issn><issn pub-type="epub">2949-5237</issn><publisher><publisher-name>ФГУП "ВНИИФТРИ"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32446/0368-1025it.2025-1-23-28</article-id><article-id custom-type="elpub" pub-id-type="custom">izmertech-2281</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>К 70-ЛЕТИЮ ВНИИФТРИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ON THE 70TH ANNIVERSARY OF VNIIFTRI</subject></subj-group></article-categories><title-group><article-title>Экспериментальная проверка космических радиотехнических методов измерения параметров гравитационного поля Земли.</article-title><trans-title-group xml:lang="en"><trans-title>Experimental verification of space radiotechnical methods for measuring the parameters of the Earth's gravitational field.</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7520-0256</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Давлатов</surname><given-names>Р. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Davlatov</surname><given-names>R. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p> Руслан Аскарджонович Давлатов - Начальник лаборатории</p></bio><bio xml:lang="en"><p>Ruslan A. Davlatov</p></bio><email xlink:type="simple">davlatov@vniiftri.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7902-0212</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Фатеев</surname><given-names>В. Ф.</given-names></name><name name-style="western" xml:lang="en"><surname>Fateev</surname><given-names>V. F.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Вячеслав Филиппович Фатеев - Главный научный сотрудник</p></bio><bio xml:lang="en"><p>Vyacheslav F. Fateev</p></bio><email xlink:type="simple">generalfat@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7591-8877</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лопатин</surname><given-names>В. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Lopatin</surname><given-names>V. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Владислав Павлович Лопатин</p></bio><bio xml:lang="en"><p>Vladislav P. Lopatin</p></bio><email xlink:type="simple">gagaringiga@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Всероссийский научно-исследовательский институт физико-технических и радиотехнических измерений</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Russian Metrological Institute of Technical Physics and Radio Engineering</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>03</day><month>04</month><year>2025</year></pub-date><volume>74</volume><issue>1</issue><fpage>23</fpage><lpage>28</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; ФГУП "ВНИИФТРИ", 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">ФГУП "ВНИИФТРИ"</copyright-holder><copyright-holder xml:lang="en">ФГУП "ВНИИФТРИ"</copyright-holder><license xlink:href="https://www.izmt.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://www.izmt.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://www.izmt.ru/jour/article/view/2281">https://www.izmt.ru/jour/article/view/2281</self-uri><abstract><p>Представлены результаты двух радиотехнических экспериментов по измерению параметров гравитационного поля Земли с использованием сигналов низкоорбитальных космических аппаратов и глобальных навигационных спутниковых систем. Экспериментально проверены ранее предложенные авторами метод измерения ускорения свободного падения по сигналам низкоорбитального спутника, а также метод измерения текущей высоты геоида на основе бортовой бистатической радиолокационной системы, использующей сигналы глобальных навигационных спутниковых систем. В первом эксперименте использовали сигнал низкоорбитального малого космического аппарата RS-44 (ДОСААФ-85) с частотой около 2,3 ГГц, во втором эксперименте – первичные измерительные данные бистатической радиолокационной системы, установленной на борту зарубежного спутника CYGNSS. После обработки результатов измерений, полученных в первом эксперименте, установлено, что среднеквадратическое отклонение измеренных значений гравитационного ускорения низкоорбитального космического аппарата от модельных значений составляет 6,3 мГал. В настоящее время измерения ускорения свободного падения на основе механических гравиметров на борту спутника невозможны из-за невесомости. Во втором эксперименте измеренное и модельное значения высоты геоида отличаются на 13,3 см, что отвечает современным требованиям. Метод измерения текущей высоты геоида на основе бортовой бистатической радиолокационной системы, в отличие от классического метода спутниковой радиовысотометрии, позволяет получить до 60 отражённых сигналов и измеряемых высот одновременно. Результаты экспериментов могут найти применение при уточнении модели гравитационного поля Земли удалённых территорий и акваторий, в том числе в регионе Арктики.</p></abstract><trans-abstract xml:lang="en"><p>The results of two radiotechnical experiments on measuring the parameters of the Earth's gravitational field using signals from low-orbit spacecraft and global navigation satellite systems are presented. The authors' previously proposed method of measuring the acceleration of gravity using signals from a low-orbit satellite, as well as the method of measuring  the current height of the geoid based on an onboard bistatic radar system, are experimentally verified. In the first experiment, a signal from the low-orbit small spacecraft RS-44 (DOSAAF-85) with a frequency of about 2.3 GHz was used, in the second experiment primary measurement data from a bistatic radar system installed on board a foreign satellite CYGNSS. As a result of processing the measurement results obtained in the first experiment, a difference was established between the measured and model values of the gravitational acceleration of the low-orbit spacecraft with a standard deviation of 6.3 mGal. Currently, gravity acceleration measurements based on mechanical gravimeters on board a satellite are impossible due to weightlessness. In the second experiment, the measured and model values of the geoid height profile differ from each other by 13.3 cm, which meets modern requirements. The method of measuring the current geoid height based on an onboard bistatic radar system, unlike the classical method of satellite radio altimetry, allows for up to 60 reflected signals and measured heights simultaneously. The experimental results can be used to refine the model of the Earth's gravity field in remote territories and water areas, including the Arctic region.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>гравитационное поле Земли</kwd><kwd>гравитационное ускорение</kwd><kwd>низкоорбитальный космический аппарат</kwd><kwd>глобальные навигационные спутниковые системы</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Earth's gravitational field</kwd><kwd>gravitational acceleration</kwd><kwd>low-orbit spacecraft</kwd><kwd>global navigation satellite systems</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено при финансовой поддержке РНФ в рамках научного проекта № 23-67-10007, https://rscf.ru/project/23-67-10007.</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">Денисенко О. В., Пустовойт В. И., Сильвестров И. С., Фатеев В. Ф. 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