Radio Physics and Radio Astronomy最新文献

{"title":"OPERATOR METHOD IN THE PROBLEM OF AN H-POLARIZED PLANE WAVE DIFFRACTION BY A DOUBLE-LAYER INFINITE PERIODIC STRIP GRATING IN THE ABSENCE OF ONE STRIP IN EVERY LAYER","authors":"M. Kaliberda, L. Lytvynenko, S. Pogarsky","doi":"10.15407/rpra25.02.136","DOIUrl":"https://doi.org/10.15407/rpra25.02.136","url":null,"abstract":"","PeriodicalId":33380,"journal":{"name":"Radio Physics and Radio Astronomy","volume":"25 1","pages":"136-146"},"PeriodicalIF":0.0,"publicationDate":"2020-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48456547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"INFLUENCE OF THE SOLAR WIND ON INTERFEROMETRIC OBSERVATIONS AT THE DECAMETER WAVELENGTHS","authors":"V. Shepelev, O. A. Litvinenko, K. Georgieva, B. Kirov","doi":"10.15407/rpra25.02.087","DOIUrl":"https://doi.org/10.15407/rpra25.02.087","url":null,"abstract":"","PeriodicalId":33380,"journal":{"name":"Radio Physics and Radio Astronomy","volume":"25 1","pages":"87-99"},"PeriodicalIF":0.0,"publicationDate":"2020-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44653869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"RADIATION OF A LONGITUDINALLY INHOMOGENEOUS PLASMA COLUMN WITH A DIELECTRIC SHELL","authors":"A. Artemenko, V. Karlov, Y. Kirichenko, O. Lukashuk","doi":"10.15407/rpra25.02.158","DOIUrl":"https://doi.org/10.15407/rpra25.02.158","url":null,"abstract":"","PeriodicalId":33380,"journal":{"name":"Radio Physics and Radio Astronomy","volume":"25 1","pages":"158-167"},"PeriodicalIF":0.0,"publicationDate":"2020-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44670341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"FRACTAL RADIOPHYSICS. 1. THEORETICAL BASES","authors":"O. Lazorenko, L. Chernogor","doi":"10.15407/rpra25.01.003","DOIUrl":"https://doi.org/10.15407/rpra25.01.003","url":null,"abstract":"","PeriodicalId":33380,"journal":{"name":"Radio Physics and Radio Astronomy","volume":"25 1","pages":"3-77"},"PeriodicalIF":0.0,"publicationDate":"2020-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48665623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EXTENDED SCATTERING ENVELOPE IN THE Q2237+0305 QUASAR","authors":"L. Berdina, V. Tsvetkova, V. Shulga","doi":"10.15407/rpra24.04.242","DOIUrl":"https://doi.org/10.15407/rpra24.04.242","url":null,"abstract":"","PeriodicalId":33380,"journal":{"name":"Radio Physics and Radio Astronomy","volume":"24 1","pages":"242-253"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42458419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PROPERTY STUDY OF OJ 287 AND BL LAC VARIABILITY IN OPTICALAND RADIO RANGES","authors":"A. Sukharev, M. Ryabov, V. Bezrukovs","doi":"10.15407/rpra24.04.254","DOIUrl":"https://doi.org/10.15407/rpra24.04.254","url":null,"abstract":"","PeriodicalId":33380,"journal":{"name":"Radio Physics and Radio Astronomy","volume":"24 1","pages":"254-271"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44326324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"LASER-MICROWAVE SPECTROMETER AND SPECTROSCOPY OF ZINC ATOM IN TRIPLET RYDBERG STATES","authors":"N. L. Pogrebnyak, S. Dyubko, E. Alekseev, M. P. Perepechai, A. Tkachev, S. Vlasenko","doi":"10.15407/rpra24.04.272","DOIUrl":"https://doi.org/10.15407/rpra24.04.272","url":null,"abstract":"","PeriodicalId":33380,"journal":{"name":"Radio Physics and Radio Astronomy","volume":"24 1","pages":"272-284"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42383491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EFFECT OF THE GROUND PARAMETER VARIATIONS ON THE SENSITIVITY OF AN ACTIVE PHASED ARRAY ANTENNA ELEMENT OF THE LOW-FREQUENCY GURT RADIO TELESCOPE","authors":"P. Tokarsky, A. Konovalenko, N. Kalinichenko, S. Yerin","doi":"10.15407/rpra24.04.233","DOIUrl":"https://doi.org/10.15407/rpra24.04.233","url":null,"abstract":"","PeriodicalId":33380,"journal":{"name":"Radio Physics and Radio Astronomy","volume":"24 1","pages":"233-241"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49121216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ON THE APPLICABILITY OF THE PHASE SCANNING METHOD IN ANTENNA ARRAYS OF CHIRP PULSE RADARS","authors":"V. Galushko, D. Vavriv","doi":"10.15407/rpra24.04.285","DOIUrl":"https://doi.org/10.15407/rpra24.04.285","url":null,"abstract":"","PeriodicalId":33380,"journal":{"name":"Radio Physics and Radio Astronomy","volume":"24 1","pages":"285-299"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41541791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PERFORMANCE ANALYSIS OF USING TAPERED WINDOWS FOR SIDELOBE REDUCTION IN CHIRP-PULSE COMPRESSION","authors":"V. Galushko","doi":"10.15407/rpra24.04.300","DOIUrl":"https://doi.org/10.15407/rpra24.04.300","url":null,"abstract":"УДК 621.396.96 Предмет и цель работы: Анализ структуры выходного сигнала оптимального фильтра сжатия ЛЧМ-импульсов с целью выяснения причин несоответствия уровня боковых лепестков, получаемого при использовании стандартных сглаживающих окон, литературным данным. Методы и методология: Для расчета структуры отклика оптимального фильтра со сглаживающим окном общего вида используются стандартные методы математической физики и статистической теории обработки сигналов. Результаты: Приведены выражения для оценки максимального количества нулей и максимумов реакции оптимального фильтра сжатия ЛЧМ-импульсов, а также разноса между соседними и “одноименными” (с одинаковыми номерами) нулями и максимумами в зависимости от базы сигнала. Получены формулы для оценки потерь в отношении сигнал/шум из-за применения сглаживающих функций. Подробно рассмотрен случай применения оконных функций в виде набора косинусных гармоник ряда Фурье, которым описывается достаточно большое количество стандартных окон. Получено аналитическое выражение для выходного сигнала фильтра сжатия ЛЧМ-импульсов с использованием таких окон, приведена формула для оценки потерь в отношении сигнал/шум. Проведен сравнительный анализ эффективности применения окон Хэмминга и Блэкмана в зависимости от базы сигнала B. Показано, что при значениях B ≤ 80 более эффективным является использование окна Хэмминга. При больших значениях B более эффективным становится окно Блэкмана. С ростом B эффективность обоих окон возрастает, асимптотически приближаясь к приводимым в литературе показателям. Эмпирическим путем подобраны коэффициенты оконных функций, состоящих из трех косинусных гармоник ряда Фурье, что позволило уменьшить уровень боковых лепестков, по сравнению с применением окна Хэмминга, приблизительно на 0.34 дБ при B = 21 и на более чем 1 дБ при B = 7. Заключение: Полученные результаты позволяют сделать вывод, что при небольших базах сигнала задачу оптимизации параметров оконной функции нужно решать отдельно для каждого конкретного значения B . Добиться предельно низкого уровня боковых лепестков при этом, скорее всего, не удастся, но определенное улучшение характеристик фильтра сжатия ЛЧМ-импульсов вполне возможно. Ключевые слова: ЛЧМ-импульс, фильтр сжатия импульсов, оконная функция, уровень боковых лепестков Статья поступила в редакцию 11.09.2019 Radio phys. radio astron. 2019, 24(4): 300-313 СПИСОК ЛИТЕРАТУРЫ 1. Cook C. E. and Bernfeld M. Radar Signals : An Introduction to Theory and Application . New York, London: Academic Press, 1967. 550 p. 2. Barton D. K. Radar System Analysis and Modeling . Boston, London: Artech House Publishers, 2004. 566 p. 3. Ducoff M. R. and Tietjen B. W. Pulse Compression Radar. In: M. I. Skolnik, ed. Radar Handbook . New York, Chicago, San Francisco et al.: McGraw-Hill Companies, 2008. P. 8.1–8.44. 4. Levanon N. and Mozeson E. Radar Signals . Hoboken, New Jersey: John Wiley&Sons, Inc., 2004. 432 p. 5. Трухачев А. А. Радиолокационные сигналы и их применения . Москва: Воениз","PeriodicalId":33380,"journal":{"name":"Radio Physics and Radio Astronomy","volume":"24 1","pages":"300-313"},"PeriodicalIF":0.0,"publicationDate":"2019-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41876600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}