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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">mireabulletin</journal-id><journal-title-group><journal-title xml:lang="ru">Russian Technological Journal</journal-title><trans-title-group xml:lang="en"><trans-title>Russian Technological Journal</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2782-3210</issn><issn pub-type="epub">2500-316X</issn><publisher><publisher-name>RTU MIREA</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32362/2500-316X-2023-11-1-31-40</article-id><article-id custom-type="elpub" pub-id-type="custom">mireabulletin-612</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>СОВРЕМЕННЫЕ РАДИОТЕХНИЧЕСКИЕ И ТЕЛЕКОММУНИКАЦИОННЫЕ СИСТЕМЫ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MODERN RADIO ENGINEERING AND TELECOMMUNICATION SYSTEMS</subject></subj-group></article-categories><title-group><article-title>Пропускная способность гидроакустического канала связи</article-title><trans-title-group xml:lang="en"><trans-title>Hydroacoustic communication channel capacity</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5824-8741</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Денисов</surname><given-names>В. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Denisov</surname><given-names>V. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Денисов Валерий Евгеньевич, старший преподаватель кафедры радиоволновых процессов и технологий Института радиоэлектроники и информатики</p><p>119454, Москва, пр–т Вернадского, д. 78</p></bio><bio xml:lang="en"><p>Valery E. Denisov, Senior Lecturer, Department of Radio Wave Processes and Technologies, Institute of Radio Electronics and Informatics</p><p>78 Vernadskogo pr., Moscow, 119454</p><p> </p></bio><email xlink:type="simple">denisov@mirea.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>МИРЭА – Российский технологический университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>MIREA – Russian Technological University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>02</day><month>02</month><year>2023</year></pub-date><volume>11</volume><issue>1</issue><fpage>31</fpage><lpage>40</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Денисов В.Е., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Денисов В.Е.</copyright-holder><copyright-holder xml:lang="en">Denisov V.E.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.rtj-mirea.ru/jour/article/view/612">https://www.rtj-mirea.ru/jour/article/view/612</self-uri><abstract><p>Цели. Пропускная способность является важной характеристикой любого канала связи, так как определяет предельную скорость передачи информации в нем. Основная цель работы – определение пропускной способности гидроакустического канала связи при ограничении на среднюю интенсивность передаваемого сигнала. Дополнительной задачей являлось определение оптимального спектра передаваемого сигнала и расчет граничных частот этого спектра. Была рассмотрена модель однолучевого канала, характерная для глубокого моря, когда приемник или передатчик расположены на достаточной глубине.Методы. Использованы положения прикладной гидроакустики, теории случайных процессов и теории информации.Результаты. Получено выражение для коэффициента передачи гидроакустического канала связи и новое выражение для спектрального уровня шумов моря, обусловленных волнением поверхности моря. На основе кусочно-линейной аппроксимации кривых спектральных уровней шумов турбулентности, судоходства, волнения моря и теплового шума моря определена спектральная плотность интенсивности шума моря. Получены зависимости пропускной способности гидроакустического канала от дальности связи, интенсивности передаваемого сигнала и состояния поверхности моря. Определены нижняя и верхняя частоты оптимального спектра передаваемого сигнала и оптимальный спектр. Исследована зависимость коэффициента использования полосы частот от интенсивности входного сигнала для разных значений дальности связи.Выводы. Использование коэффициента затухания Франсуа – Гаррисона позволило связать пропускную способность канала с параметрами морской среды: температурой, соленостью, значением водородного показателя в иcследуемом районе. При заданной интенсивности входного сигнала пропускная способность существенно уменьшается с ростом дальности и усилением волнения моря. Показано, что с ростом расстояния ширина оптимального спектра уменьшается. Отмечается значительное влияние шума от волнения моря на форму оптимального спектра и значения его граничных частот. Было установлено, что возможны случаи увеличения коэффициента использования полосы частот ростом дальности при заданной интенсивности входного сигнала.</p></abstract><trans-abstract xml:lang="en"><sec><title>Objectives</title><p>Objectives. Capacity, describing the maximum rate of information transmission, is an important characteristic of any communication channel. The main purpose of this work isto determine the capacity of a hydroacoustic communication channel with constrained average intensity of the transmitted signal. An additional aim consists in finding the optimal spectrum of a transmitted signal and calculate its boundary frequencies. A model of a single-path channel was considered, which is characteristic of the deep sea with the receiver or transmitter placed at a sufficient depth.</p></sec><sec><title>Methods</title><p>Methods. Concepts of applied hydroacoustics, the theory of random processes, and information theory were used. </p></sec><sec><title>Results</title><p>Results. An expression for gain in a hydroacoustic communication channel has been obtained. A novel expression derived for the spectral level of sea noise caused by sea surface waves is based on piecewise linear approximation of the curves of the spectral levels of noise obtained from four sources: turbulence, shipping, sea waves, and the thermal noise of the sea. Dependencies of the hydroacoustic channel capacity on communication distance, intensity of the transmitted signal, and sea state, are characterized. The definition of the optimal spectrum itself is determined along with the lower and upper boundary frequencies of the optimal spectrum of the transmitted signal. The dependence of the bandwidth usage on the intensity of the input signal at various communication distances has been investigated.</p></sec><sec><title>Conclusions</title><p>Conclusions. On the basis of the Francois–Garrison attenuation coefficient, channel capacity was correlated with the parameters of the marine environment: temperature, salinity, and pH in the study area. At a given intensity of the input signal, channel capacity was shown to decrease significantly with increasing distance and sea wave intensity. It is also shown that the width of the optimal spectrum decreases with increasing distance. Sea wave noise was noted to affect significantly the shape of the optimal spectrum and its boundary frequencies. The possibility of cases where bandwidth usage increases with increasing distance at a given input signal intensity cannot be ruled out.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>гидроакустический канал связи</kwd><kwd>шумы моря</kwd><kwd>спектральная интенсивность шумов моря</kwd><kwd>интенсивность сигнала</kwd><kwd>пропускная способность</kwd><kwd>оптимальный спектр</kwd><kwd>коэффициент использования полосы частот канала</kwd></kwd-group><kwd-group xml:lang="en"><kwd>hydroacoustic communication channel</kwd><kwd>sea noise</kwd><kwd>spectral intensity of sea noise</kwd><kwd>signal intensity</kwd><kwd>bandwidth</kwd><kwd>optimal spectrum</kwd><kwd>channel bandwidth utilization</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Stojanovic M. On the relationship between capacity and distance in an underwater acoustic communication channel. 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