Pub Date : 2019-06-01DOI: 10.1109/RSEMW.2019.8792689
D. Blagoveshchensky, O. Maltseva, G. Zhbankov
Despite certain limitations, the RI model is widely used in the interpretation and prediction of oblique propagation characteristics, for example, MUF. A special role is played by the adaptation (assimilation) of the model to the current diagnostics data, which makes it possible to correct the model in real time. The most widely used adaptation is to the main parameters of the ionosphere foF2 and hmF2. With the possibility of measuring the total electron content TEC, the values of this parameter are used for adaptation through the definition of foF2 using, for example, the equivalent slab thickness of the ionosphere or other approaches. However, in almost all cases there is a residual deviation of the calculated values of the MUF from the experimental MOFs, which is attributed to the difference in the shapes of the model and real N(h)-profiles. In this paper, to eliminate the residual deviation, the values of the B0 and B1 parameters are used, determining the shape of the N(h)- profiles of the lower ionosphere, which is close to real. One of the most quiet days was chosen on February 13, 2014 on the Dickson-Pevek path of oblique sounding. It is shown that the use of B0 and B1 can reduce the residual discrepancy, but does not remove it completely. The reason is the lack of accuracy in determining B0 and B1 in the high-latitude zone.
{"title":"On the Role of the Ionospheric Parameters B0 and B1 in the Matching of Calculated and Experimental Values of MUF","authors":"D. Blagoveshchensky, O. Maltseva, G. Zhbankov","doi":"10.1109/RSEMW.2019.8792689","DOIUrl":"https://doi.org/10.1109/RSEMW.2019.8792689","url":null,"abstract":"Despite certain limitations, the RI model is widely used in the interpretation and prediction of oblique propagation characteristics, for example, MUF. A special role is played by the adaptation (assimilation) of the model to the current diagnostics data, which makes it possible to correct the model in real time. The most widely used adaptation is to the main parameters of the ionosphere foF2 and hmF2. With the possibility of measuring the total electron content TEC, the values of this parameter are used for adaptation through the definition of foF2 using, for example, the equivalent slab thickness of the ionosphere or other approaches. However, in almost all cases there is a residual deviation of the calculated values of the MUF from the experimental MOFs, which is attributed to the difference in the shapes of the model and real N(h)-profiles. In this paper, to eliminate the residual deviation, the values of the B0 and B1 parameters are used, determining the shape of the N(h)- profiles of the lower ionosphere, which is close to real. One of the most quiet days was chosen on February 13, 2014 on the Dickson-Pevek path of oblique sounding. It is shown that the use of B0 and B1 can reduce the residual discrepancy, but does not remove it completely. The reason is the lack of accuracy in determining B0 and B1 in the high-latitude zone.","PeriodicalId":158616,"journal":{"name":"2019 Radiation and Scattering of Electromagnetic Waves (RSEMW)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128475706","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}
Pub Date : 2019-06-01DOI: 10.1109/RSEMW.2019.8792692
O. Pak, V. Zakharchenko
The theoretical analysis of the linear mathematical model of the radio pulse gating system in the conditions of phase instability were carried out. An asymptotic estimate of the efficiency of the stroboscopic converter, depending on the magnitude of the phase noise, is constructed. The results of the semi-natural modeling of the influence of phase fluctuations on the envelope of the useful signal are presented. It’s shown the phase noises lead to an additional parasitic amplitude modulation signal transformed in time.
{"title":"Radio pulse Stroboscopic Transformation of Coherent Radio Signals in Conditions of Interference","authors":"O. Pak, V. Zakharchenko","doi":"10.1109/RSEMW.2019.8792692","DOIUrl":"https://doi.org/10.1109/RSEMW.2019.8792692","url":null,"abstract":"The theoretical analysis of the linear mathematical model of the radio pulse gating system in the conditions of phase instability were carried out. An asymptotic estimate of the efficiency of the stroboscopic converter, depending on the magnitude of the phase noise, is constructed. The results of the semi-natural modeling of the influence of phase fluctuations on the envelope of the useful signal are presented. It’s shown the phase noises lead to an additional parasitic amplitude modulation signal transformed in time.","PeriodicalId":158616,"journal":{"name":"2019 Radiation and Scattering of Electromagnetic Waves (RSEMW)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116318292","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}
Pub Date : 2019-06-01DOI: 10.1109/RSEMW.2019.8792687
S. Krutiev, V. Zemlyakov, D. Lonkina
The synthesis of waveguide band-pass elliptic filters is realized. The thin transverse resonance diaphragms with an aperture in the form of a rectangular window with two metal L-shaped metal ridges are used as resonators of the filter. An equivalent circuit of a resonant diaphragm is proposed. The synthesis results of an elliptic filter for a rectangular waveguide WR137 with a bandwidth of 9,2% and length of 64 mm are presented.
{"title":"A Design of Waveguide Elliptic Filter Based on Metal Resonant Diaphragms with L-Shaped Ridges","authors":"S. Krutiev, V. Zemlyakov, D. Lonkina","doi":"10.1109/RSEMW.2019.8792687","DOIUrl":"https://doi.org/10.1109/RSEMW.2019.8792687","url":null,"abstract":"The synthesis of waveguide band-pass elliptic filters is realized. The thin transverse resonance diaphragms with an aperture in the form of a rectangular window with two metal L-shaped metal ridges are used as resonators of the filter. An equivalent circuit of a resonant diaphragm is proposed. The synthesis results of an elliptic filter for a rectangular waveguide WR137 with a bandwidth of 9,2% and length of 64 mm are presented.","PeriodicalId":158616,"journal":{"name":"2019 Radiation and Scattering of Electromagnetic Waves (RSEMW)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117146891","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}
Pub Date : 2019-06-01DOI: 10.1109/RSEMW.2019.8792719
O. Plokhikh, V. Ivanov, S. Kudinov
The report discusses the development and implementation of Russian upper-air sounding system based on GNSS. The structure, technical characteristics of the developed system are given. Separately, the issues of the radiosonde radio channel development and coordinate data processing were considered.
{"title":"Development And Implementation of the Upper-Air Sounding System Based on GNSS","authors":"O. Plokhikh, V. Ivanov, S. Kudinov","doi":"10.1109/RSEMW.2019.8792719","DOIUrl":"https://doi.org/10.1109/RSEMW.2019.8792719","url":null,"abstract":"The report discusses the development and implementation of Russian upper-air sounding system based on GNSS. The structure, technical characteristics of the developed system are given. Separately, the issues of the radiosonde radio channel development and coordinate data processing were considered.","PeriodicalId":158616,"journal":{"name":"2019 Radiation and Scattering of Electromagnetic Waves (RSEMW)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115796111","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}
Pub Date : 2019-06-01DOI: 10.1109/RSEMW.2019.8792732
E. S. Malevich, M. S. Mikhailov, A. A. Volkova
The results of an experimental research of the attenuation of a signal in the X-band of frequency range when passing through a forest environment are presented. The conditions of the location of the deployed radio link passing through the forest are described. For comparison, a simulation of the forest environment was carried out using a flat-layered model, on the basis of which one can speak of a good qualitative agreement of the results. The proposed technique allows for a preliminary assessment in the design of antenna systems for different purposes.
{"title":"Comparison of the Results of an Experimental Research of the Radio Wave Propagation in the Forest with Numerical Simulation","authors":"E. S. Malevich, M. S. Mikhailov, A. A. Volkova","doi":"10.1109/RSEMW.2019.8792732","DOIUrl":"https://doi.org/10.1109/RSEMW.2019.8792732","url":null,"abstract":"The results of an experimental research of the attenuation of a signal in the X-band of frequency range when passing through a forest environment are presented. The conditions of the location of the deployed radio link passing through the forest are described. For comparison, a simulation of the forest environment was carried out using a flat-layered model, on the basis of which one can speak of a good qualitative agreement of the results. The proposed technique allows for a preliminary assessment in the design of antenna systems for different purposes.","PeriodicalId":158616,"journal":{"name":"2019 Radiation and Scattering of Electromagnetic Waves (RSEMW)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127165510","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}
Pub Date : 2019-06-01DOI: 10.1109/RSEMW.2019.8792785
A. Sobolev, L. Kuzmin, Behrokh Beiranvand, A. V. Kudryashov, A. Ilin
In this report we present the concept of a planar array of cold-electron bolometers, which may potentially absorb 50 to 80 percent of the incident terahertz power with linear polarization in the frequency range 50-800 GHz. The array consists of a periodically arranged unit cells each containing a ring with the four bolometers. The performance of the array unit cell is simulated numerically. The experimentally measured frequency response of the bolometric array with 10×10 unit cells in the frequency range 230-370 GHz is presented. (Abstract)
{"title":"Ultrawideband Metamaterial-Based Array of Cold-Electron Bolometers","authors":"A. Sobolev, L. Kuzmin, Behrokh Beiranvand, A. V. Kudryashov, A. Ilin","doi":"10.1109/RSEMW.2019.8792785","DOIUrl":"https://doi.org/10.1109/RSEMW.2019.8792785","url":null,"abstract":"In this report we present the concept of a planar array of cold-electron bolometers, which may potentially absorb 50 to 80 percent of the incident terahertz power with linear polarization in the frequency range 50-800 GHz. The array consists of a periodically arranged unit cells each containing a ring with the four bolometers. The performance of the array unit cell is simulated numerically. The experimentally measured frequency response of the bolometric array with 10×10 unit cells in the frequency range 230-370 GHz is presented. (Abstract)","PeriodicalId":158616,"journal":{"name":"2019 Radiation and Scattering of Electromagnetic Waves (RSEMW)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128127328","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}
Pub Date : 2019-06-01DOI: 10.1109/RSEMW.2019.8792762
N. I. Bobkov, I. N. Bobkov
A review of methods for constructing multibeam antenna arrays forming frequency-independent radiation characteristics in a wide frequency band is presented. A comparison of the methods is given and it is shown that phase methods are more preferable for multibeam antenna arrays. For antenna arrays with uniform amplitude excitation, variations of phase methods for the formation of frequency-independent radiation characteristics are considered. For linear multibeam arrays, a method is proposed based on the properties of non-equidistant discrete apertures. For two-dimensional arrays, a method based on the choice of aperture configuration forming a falling amplitude distribution of an equivalent linear radiator is considered. It is shown that the effect of stabilization of partial radiation patterns can be achieved in a frequency band of at least four octaves wide.
{"title":"Broadband Multibeam Frequency-Independent Antenna Arrays","authors":"N. I. Bobkov, I. N. Bobkov","doi":"10.1109/RSEMW.2019.8792762","DOIUrl":"https://doi.org/10.1109/RSEMW.2019.8792762","url":null,"abstract":"A review of methods for constructing multibeam antenna arrays forming frequency-independent radiation characteristics in a wide frequency band is presented. A comparison of the methods is given and it is shown that phase methods are more preferable for multibeam antenna arrays. For antenna arrays with uniform amplitude excitation, variations of phase methods for the formation of frequency-independent radiation characteristics are considered. For linear multibeam arrays, a method is proposed based on the properties of non-equidistant discrete apertures. For two-dimensional arrays, a method based on the choice of aperture configuration forming a falling amplitude distribution of an equivalent linear radiator is considered. It is shown that the effect of stabilization of partial radiation patterns can be achieved in a frequency band of at least four octaves wide.","PeriodicalId":158616,"journal":{"name":"2019 Radiation and Scattering of Electromagnetic Waves (RSEMW)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125774392","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}
Pub Date : 2019-06-01DOI: 10.1109/RSEMW.2019.8792723
N. Danilkin, G. Zhbankov, A. Repin, I. V. Romanov, M. Filippov
To measure foF2 in the Arctic, it is proposed to use the method of reverse transionospheric sounding using powerful ground-based transmitters of the Russian Federation ionosondes and simple receivers on Russian spacecraft with highly elliptical orbits ("Arctic-M").
{"title":"Measurements of foF2 in the Arctic Based on Space and Ground-Based Ionosondes","authors":"N. Danilkin, G. Zhbankov, A. Repin, I. V. Romanov, M. Filippov","doi":"10.1109/RSEMW.2019.8792723","DOIUrl":"https://doi.org/10.1109/RSEMW.2019.8792723","url":null,"abstract":"To measure foF2 in the Arctic, it is proposed to use the method of reverse transionospheric sounding using powerful ground-based transmitters of the Russian Federation ionosondes and simple receivers on Russian spacecraft with highly elliptical orbits (\"Arctic-M\").","PeriodicalId":158616,"journal":{"name":"2019 Radiation and Scattering of Electromagnetic Waves (RSEMW)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125160076","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}
Pub Date : 2019-06-01DOI: 10.1109/RSEMW.2019.8792805
N. Anyutin, I. Malay, Alexey Malyshev
The article examines the influence of the number of measured components of the electromagnetic field on the accuracy of NF-FF transformations. The direct transformation from the scanning surface equivalent to the plane waves expansion and the inverse transformation through the equivalent currents on antenna aperture are considered. It is shown that the use of all six components of the electromagnetic field on the scanning surface makes it possible in certain conditions to reduce the errors by more than 1 dB.
{"title":"Investigation of NF-FF Transformations in the Measurement of all Components of the Electromagnetic Field","authors":"N. Anyutin, I. Malay, Alexey Malyshev","doi":"10.1109/RSEMW.2019.8792805","DOIUrl":"https://doi.org/10.1109/RSEMW.2019.8792805","url":null,"abstract":"The article examines the influence of the number of measured components of the electromagnetic field on the accuracy of NF-FF transformations. The direct transformation from the scanning surface equivalent to the plane waves expansion and the inverse transformation through the equivalent currents on antenna aperture are considered. It is shown that the use of all six components of the electromagnetic field on the scanning surface makes it possible in certain conditions to reduce the errors by more than 1 dB.","PeriodicalId":158616,"journal":{"name":"2019 Radiation and Scattering of Electromagnetic Waves (RSEMW)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121816864","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}
Pub Date : 2019-06-01DOI: 10.1109/RSEMW.2019.8792717
K. Korotkov, A. Babenko, D. Frolov, Dmitriy Nereutskiy, A. Levchenko
This article presents the features of image mixers analysis when determining a phase shift of frequency conversion devices. The authors analyzed the change in the phase of intermediate frequency components when measuring the sum and difference of two mixers. Having the intermediate frequency networks characterized separately before the mixer measurements, we could observe how the change between positive and negative sideband components affects the overall frequency response of a network with series or parallel combinations of two mixers. It was shown that, due to the change from positive to negative part of frequency spectrum, the amplitude response remains to be the same, while the phase response is changed only for intermediate frequency networks. The phase response of each mixer, radio frequency and local oscillator networks are kept constant. The obtained results imply the need for two separate calibration techniques, at the intermediate and image frequencies, when determining the frequency response of a mixer under test.
{"title":"Impact of Image Frequency Operation on Vector Mixer Characterization","authors":"K. Korotkov, A. Babenko, D. Frolov, Dmitriy Nereutskiy, A. Levchenko","doi":"10.1109/RSEMW.2019.8792717","DOIUrl":"https://doi.org/10.1109/RSEMW.2019.8792717","url":null,"abstract":"This article presents the features of image mixers analysis when determining a phase shift of frequency conversion devices. The authors analyzed the change in the phase of intermediate frequency components when measuring the sum and difference of two mixers. Having the intermediate frequency networks characterized separately before the mixer measurements, we could observe how the change between positive and negative sideband components affects the overall frequency response of a network with series or parallel combinations of two mixers. It was shown that, due to the change from positive to negative part of frequency spectrum, the amplitude response remains to be the same, while the phase response is changed only for intermediate frequency networks. The phase response of each mixer, radio frequency and local oscillator networks are kept constant. The obtained results imply the need for two separate calibration techniques, at the intermediate and image frequencies, when determining the frequency response of a mixer under test.","PeriodicalId":158616,"journal":{"name":"2019 Radiation and Scattering of Electromagnetic Waves (RSEMW)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134095224","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}
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