2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)最新文献_第7页

Soil moisture retrieval in the North Slope of Alaska from GCOM-W1/AMSR2 and Meteor-M No. 2/MTVZA-GYa radiometers data 利用GCOM-W1/AMSR2和meteo - m No. 2/MTVZA-GYa辐射计资料反演阿拉斯加北坡土壤水分

2017 Progress In Electromagnetics Research Symposium - Spring (PIERS) Pub Date : 2017-05-22 DOI: 10.1109/PIERS.2017.8261974

K. Muzalevskiy, Z. Ruzicka, M. G. Zahvatov, R. Muskett, S. Fomin

{"title":"Soil moisture retrieval in the North Slope of Alaska from GCOM-W1/AMSR2 and Meteor-M No. 2/MTVZA-GYa radiometers data","authors":"K. Muzalevskiy, Z. Ruzicka, M. G. Zahvatov, R. Muskett, S. Fomin","doi":"10.1109/PIERS.2017.8261974","DOIUrl":"https://doi.org/10.1109/PIERS.2017.8261974","url":null,"abstract":"In this paper, for the Arctic tundra region in the North Slope of Alaska, calibration of microwave emission model on the basis of AMSR2 and MTVZA-GYa radiometric data of the GCOM-W1 and Meteor-M No. 2 satellites, respectively were carried out. The GCOM-W1 and Meteor-M No. 2 brightness temperature data covered the period from January 1, 2012 to December 31, 2016 and January 1 to December 31, 2015, respectively. The peculiarity of the proposed calibration lies in the use of biomass vegetation and soil temperature estimations from the AMSR2 and the MTVZA-GYa radiometers observations with using empirical relationships. To estimate the vegetation biomass and soil temperature were proposed calibration curves linking brightness temperatures, measured by the radiometers, with the aboveground phytomass which was estimated from MODIS NDVI data, and with soil temperature which was measured by weather stations in-situ. As a result was shown that the proposed calibration allows to retrieve soil moisture at the test sites in North Slope of Alaska with determination coefficient of 0.46–0.52 and RMSE of 0.06–0.1 cm3/cm3. The study shows the potential possibility of carrying out the calibration of emission model, which improves the accuracy of the measurement of soil moisture in the Arctic region compared to existing satellite information products. This study demonstrates the possibility of using radiometer MTVZA-GYa on aboard of the Russian satellite Meteor-M No. 2 to measure soil moisture in the Arctic region. Found empirical relationships between brightness temperatures and surface soil temperature and aboveground phytomass at the test sites allows to predict these values from GCOM-W1 and Meteor-M No. 2 observations in the range of RMSE 53–54g/m2 and 1–1.5K, respectively.","PeriodicalId":387984,"journal":{"name":"2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130724746","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}

引用次数: 0

Synchronization of hidden chaotic attractors on the example of radiophysical oscillators 以辐射物理振子为例的隐藏混沌吸引子的同步

2017 Progress In Electromagnetics Research Symposium - Spring (PIERS) Pub Date : 2017-05-22 DOI: 10.1109/PIERS.2017.8262292

N. Kuznetsov, G. Leonov, N. Stankevich

引用次数: 1

Inverse coefficient problems for static Maxwell equations 静态麦克斯韦方程的反系数问题

2017 Progress In Electromagnetics Research Symposium - Spring (PIERS) Pub Date : 2017-05-22 DOI: 10.1109/PIERS.2017.8261957

R. Brizitskii, Z. Saritskaya

引用次数: 0

A metalens for subwavelength focus of light 亚波长聚焦的超透镜

2017 Progress In Electromagnetics Research Symposium - Spring (PIERS) Pub Date : 2017-05-22 DOI: 10.1109/PIERS.2017.8261716

V. Kotlyar, A. Nalimov, S. Stafeev, L. O’Faolain, E. Kozlova

引用次数: 0

Asymmetric coplanar waveguide fed monopole antenna with perturbed ground plane 带扰动地平面的非对称共面波导馈电单极天线

2017 Progress In Electromagnetics Research Symposium - Spring (PIERS) Pub Date : 2017-05-22 DOI: 10.1109/PIERS.2017.8261735

L. Meenu, S. Aiswarya, K. Sreedevi

引用次数: 5

Scintillation studies of scattered radio waves in the ionosphere 电离层中散射无线电波的闪烁研究

2017 Progress In Electromagnetics Research Symposium - Spring (PIERS) Pub Date : 2017-05-22 DOI: 10.1109/PIERS.2017.8261701

G. Jandieri, Z. Diasamidze, M. Diasamidze, I. Takidze

{"title":"Scintillation studies of scattered radio waves in the ionosphere","authors":"G. Jandieri, Z. Diasamidze, M. Diasamidze, I. Takidze","doi":"10.1109/PIERS.2017.8261701","DOIUrl":"https://doi.org/10.1109/PIERS.2017.8261701","url":null,"abstract":"Second order statistical moments of scattered radio wave in the turbulent collision magnetized plasma are investigated for the anisotropic Gaussian correlation function of electron density fluctuations using the modify smooth perturbation method taking into account polarization coefficients of the ordinary and extraordinary HF wave modes and the diffraction effects. The behavior of the phase structure function of the ordinary and extraordinary waves is different in the principle (location of an external magnetic field) plane while the same in the perpendicular plane. Anisotropy, diffraction effects and collision between plasma particals have substantial influence of the phase structure function on the extraordinary wave in the principle plane. Varing anisotropy factor the angle of arrival in the principle plane less than in the perpendicular plane. Investigation of the scintillation effects are carried out for small-scale plasma irregularities. It was shown that increasing frequency of an incident wave from 3 MHz up to 40 MHz scintillation level decreases. Splashes caused by the strong phase fluctuations are revealed in the normalized scintillation level at 40 MHz frequency. Comparison of the scintillation level at the frequencies 3 MHz and 40 MHz show that the amplitude of scintillation decreases with increasing frequency of an incident wave. Scintillation level of scattered radio wave also depends on the spectrum of electron density irregularities.","PeriodicalId":387984,"journal":{"name":"2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114470901","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}

引用次数: 0

Research on electromagnetic scattering and plasma stealth design of S-shaped inlet s型进气道电磁散射与等离子体隐身设计研究

2017 Progress In Electromagnetics Research Symposium - Spring (PIERS) Pub Date : 2017-05-22 DOI: 10.1109/PIERS.2017.8262156

Zhijie Song, Haojun Xu, Xiaolong Wei, Zeng-gui Chen

{"title":"Research on electromagnetic scattering and plasma stealth design of S-shaped inlet","authors":"Zhijie Song, Haojun Xu, Xiaolong Wei, Zeng-gui Chen","doi":"10.1109/PIERS.2017.8262156","DOIUrl":"https://doi.org/10.1109/PIERS.2017.8262156","url":null,"abstract":"Inlet duct is a strong scattering source of radar waves due to its cavity structure which can make multiple reflections of electromagnetic wave through the cavity walls. Moreover, the complicated cavity structure always makes it difficult to obtain its scattering characteristic. S-shaped inlet is a frequently-used design to reduce return radar wave, but the hiding effect is limited. Relying on its great advantages over traditional stealth technologies, plasma stealth is an emerging technology which attracts the attention of many researchers. Considering the particular structure of S-shaped inlet, a kind of closed plasma was designed to be conformal to the inlet to improve the stealth performance of S-shaped inlet. Firstly, the electromagnetic scattering characteristic of S-shaped airplane inlet was analyzed by using shooting and bouncing ray (SBR) method. Mathematical principle of SBR method was described through three procedures: geometric optical ray tracing, field intensity tracking and physical optics aperture integral. To improve SBR method, a Keller cone model was presented to obtain the contribution of edge diffraction. Then the radar cross section (RCS)of a cylindrical inlet model was calculated using SBR method and the result tallies well with that in reference, which proves the effectiveness of SBR method and the correction model for calculating scattering characteristic of inlet. Then on this basis, the RCS of a S-shaped inlet was calculated by SBR method. At last, to verify the stealth effect of plasma stealth, the RCS of the inlet with plasma was assessed.","PeriodicalId":387984,"journal":{"name":"2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121850004","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}

引用次数: 3

Heating of metal powders in the external high-frequency field 金属粉末在外高频场中的加热

2017 Progress In Electromagnetics Research Symposium - Spring (PIERS) Pub Date : 2017-05-22 DOI: 10.1109/PIERS.2017.8261709

A. V. Vodopyanov, I. Dubinov, V. Semenov

引用次数: 0

Circular microstrip patch assisted planar crossover for GPS application 用于GPS应用的圆形微带贴片辅助平面交叉

2017 Progress In Electromagnetics Research Symposium - Spring (PIERS) Pub Date : 2017-05-22 DOI: 10.1109/PIERS.2017.8262269

V. Jayakrishnan, K. Sreedevi

{"title":"Circular microstrip patch assisted planar crossover for GPS application","authors":"V. Jayakrishnan, K. Sreedevi","doi":"10.1109/PIERS.2017.8262269","DOIUrl":"https://doi.org/10.1109/PIERS.2017.8262269","url":null,"abstract":"For efficient monitoring and tracking of vehicles, aircraft or ships GPS (Global Positioning System) satellite based navigation system plays an inevitable role. For long range GPS communication and tracking, high gain antennas usually array antennas are preferred. Realized using butler matrix phased array antennas are potential candidate for providing long range communication providing directional beam. Butler matrix provides equal amplitude to the antennas by means of hybrid coupler, necessary beam orientation using phase shifter and ensures signal purity when transmission lines overlap by crossover circuit. Thus crossover will mitigate the GPS tracking of signal when transmission lines overlap each other maintaining high SNR. This paper focuses on the investigations of an L band planar crossover realised using microstrip technology. The crossover characteristics like transmission and isolation are analysed in detail. For enhancing the isolation between the decoupled ports, parent crossover is further modified maintaining good transmission between coupled ports. The analysis is done using ANSYS HFSS and the optimised crossover is fabricated on FR4 substrate and measurements are taken by using Keysight ENA 5080A Vector Network Analyser. The simulated and measured results are in good agreement with each other. This proposed crossover is the possible solution for long range wireless communication and GPS Applications.","PeriodicalId":387984,"journal":{"name":"2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121347627","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}

引用次数: 8

Temporal stability of a multi-wavelength fiber laser 多波长光纤激光器的时间稳定性

2017 Progress In Electromagnetics Research Symposium - Spring (PIERS) Pub Date : 2017-05-22 DOI: 10.1109/PIERS.2017.8261773

O. Nanii, A. Kuzmenkov, S. Lukinykh, A. I. Fedoseev, A. Smirnov, V. N. Treshikov

引用次数: 0