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2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)最新文献

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Fine Scale Partial Coherent Model Based on lidar Elevation Measurements for GNSS-R Applications 基于激光雷达高程测量的GNSS-R精细尺度部分相干模型
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560253
Bowen Ren, Jiyue Zhu, A. Bringer, L. Tsang, J. Johnson
{"title":"Fine Scale Partial Coherent Model Based on lidar Elevation Measurements for GNSS-R Applications","authors":"Bowen Ren, Jiyue Zhu, A. Bringer, L. Tsang, J. Johnson","doi":"10.23919/URSIGASS51995.2021.9560253","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560253","url":null,"abstract":"In GNSS-R (Global Navigation Satellite System Reflectometry) land applications, bistatic scattering occurs in the vicinity of the specular direction, and the scattered waves can include both coherent and incoherent components. A description of land surfaces roughness is required to predict GNSS-R specular scattering. Here we consider roughness on three distinct length scales: a microwave roughness f1(x, y) with correlation lengths of ~ 10 centimeters, a coarse scale 30-meter planar topography f3(x,y) based on digital elevation model (DEM) data, and a fine scale topography f2(X,y) between these two length scales. The fine scale topography represents the length scales in which scattered waves can transition from coherence to partial coherence to incoherence. In this paper, we investigate f2(x, y) using recent airborne lidar measurements of land surface heights. Using f = f1+ f2+ f3, fine scale partial coherent FPCN and FPCP models are applied to predict bistatic scattering coefficients near the specular direction for 30m surface area. Here “fine scale” means the fine scale topography of f2(x, y) is included. The model uses complex electric field summation and Monte Carlo simulations within a large area. For non-overlapping large areas, we use intensity summations as in radiative transfer theory. We consider a fine scale partial coherent numerical model (FPCN) that applies numerical integration to the Kirchhoff integral using 2 cm discretization. The fine scale partial coherent patch model (FPCP) uses planar patches o fL size, where L is less than the correlation length of f2. Numerical illustrations show that the results of the FPCN and FPCP are in good agreement with each other. Comparisons are also made with geometric optics model (GO) with and without the attenuation factor of microwave roughness.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132866193","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: 1
Analysis of Capacitive Wireless Power Transfer SIMO Systems based on the Duality Principle 基于对偶原理的电容式无线电力传输SIMO系统分析
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560461
B. Minnaert, G. Monti, A. Costanzo, M. Mongiardo
{"title":"Analysis of Capacitive Wireless Power Transfer SIMO Systems based on the Duality Principle","authors":"B. Minnaert, G. Monti, A. Costanzo, M. Mongiardo","doi":"10.23919/URSIGASS51995.2021.9560461","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560461","url":null,"abstract":"Inductive wireless power transfer is a more mature technology than capacitive wireless transfer. The aim of this work is to illustrate the duality principle as tool to transfer results from the inductive into the capacitive wireless power research. The efficiency maximization by varying the loads for a Single-Input Multiple-Output system is considered to exemplify this principle, and to highlight some limitations.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"200 1‐6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132904936","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: 2
A contactless measurement of the surface impedance of a thin sheet of material 对薄片材料表面阻抗的一种非接触测量
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560562
S. Rodini, S. Genovesi, G. Manara, F. Costa
{"title":"A contactless measurement of the surface impedance of a thin sheet of material","authors":"S. Rodini, S. Genovesi, G. Manara, F. Costa","doi":"10.23919/URSIGASS51995.2021.9560562","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560562","url":null,"abstract":"Surface impedance value represents a crucial parameter for the characterization of thin sheets of material. A method for the estimation of this quantity that does not require a direct contact with the sample under test is proposed. The surface impedance is calculated through an inversion procedure that exploits the scattering parameters obtained from the proposed waveguide measurement setup. An inversion procedure based on the representation of the waveguide-air section-waveguide section as a T junction is employed. It is also shown that the absence of contact of the sample under test and the waveguide determines the leakage of electric fields which invalidate the inversion procedure. An improved configuration including an electromagnetic band-gap (EBG) structure is used to make the estimation of the surface impedance more accurate.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132169602","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: 5
Angle-Resolved THz Channel Measurements at 300 GHz in a Conference Room Environment 会议室环境下300 GHz角分辨太赫兹通道测量
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560459
A. Schultze, Fabian Undi, M. Peter, W. Keusgen, Taro Eichler
{"title":"Angle-Resolved THz Channel Measurements at 300 GHz in a Conference Room Environment","authors":"A. Schultze, Fabian Undi, M. Peter, W. Keusgen, Taro Eichler","doi":"10.23919/URSIGASS51995.2021.9560459","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560459","url":null,"abstract":"This paper introduces a correlative time-domain THz channel sounder supporting angle-resolved measurements. It operates at a center frequency of 300 GHz with a measurement bandwidth of 2 GHz. The channel sounder was used to collect impulse response data for a conference room environment to analyze the characteristics of the channel in terms of path gain, delay spread and angular spread. The evaluations show that with the chosen arrangement a good coverage can be achieved in the room and a large number of significant multipaths are received from various directions.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127813027","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: 11
Security Enhancement of Directional Modulation Scheme Against Hybrid Eavesdroppers 方向调制方案对混合窃听者的安全性增强
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560277
B. Qiu, Ling Wang, Xin Yang, Jian Xie
{"title":"Security Enhancement of Directional Modulation Scheme Against Hybrid Eavesdroppers","authors":"B. Qiu, Ling Wang, Xin Yang, Jian Xie","doi":"10.23919/URSIGASS51995.2021.9560277","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560277","url":null,"abstract":"The goal of this paper is to address the physical layer security (PLS) problem for a hybrid wiretapping wireless system, where active eavesdroppers (AE) and passive eavesdroppers (PE) may coexist to intercept the confidential messages and disrupt traffic. To this end, we propose a directional modulation (DM) scheme that uses frequency diverse array (FDA) with aided artificial noise (AN) technique at the transmitter to achieve angle-range dependent secure transmission, and phased-array antennas at the receiver to eliminate the jamming signals. Simulation results verify the superiority of the proposed scheme.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131306251","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: 2
Polarization-Independent Aperture-to-Aperture Transfer Scheme for Simultaneous Wireless Information and Power 无线信息与功率同步传输的偏振无关孔径传输方案
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560404
Hao Zhang, Zhaoyan Guo, Siping Gao
{"title":"Polarization-Independent Aperture-to-Aperture Transfer Scheme for Simultaneous Wireless Information and Power","authors":"Hao Zhang, Zhaoyan Guo, Siping Gao","doi":"10.23919/URSIGASS51995.2021.9560404","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560404","url":null,"abstract":"Information cannot be transferred wirelessly independent from power. Therefore, an aperture-to-aperture transfer with high efficiency is critical for no matter information and power transfer systems. Nevertheless, the aperture-to-aperture transfer efficiency always suffers TX/RX antenna polarization misalignments. In this work, an aperture-to-aperture transfer scheme is proposed to enable maximum power link from linearly polarized electromagnetic wave without any worry on polarization tilt (i.e., polarization-independent). The aperture-to-aperture scheme is modeled by S-parameters of three-port network, and validated with rigorously theory analysis and experiment measurements, which is perfect for the simultaneous wireless information and power transfer.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133751514","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
A Coherence-Based Off-Axis Laser Beam Detection System 基于相干的离轴激光束检测系统
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560508
E. Bleszynski, M. Bleszynski, T. Jaroszewicz
{"title":"A Coherence-Based Off-Axis Laser Beam Detection System","authors":"E. Bleszynski, M. Bleszynski, T. Jaroszewicz","doi":"10.23919/URSIGASS51995.2021.9560508","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560508","url":null,"abstract":"We describe a concept of a system for detecting laser radiation in the presence of other (background) radiation sources. Unlike most existent laser-warning methods, which detect laser beams based on their intensity and monochromaticity, the proposed approach uses a high degree of coherence as the distinguishing property of laser radiation. Further, in contrast to previously considered coherence detection systems, based on amplitude interferometry (AI), we propose to utilize intensity interferometry (II), pioneered by Hanbury Brown and Twiss and originally applied to thermal radiation sources, but here generalized to coexisting high- and low-coherence radiation. In this contribution we concentrate on a possible application of the proposed system in detection of off-axis laser beam radiation scattered on atmospheric medium particles (water droplets and aerosols, especially dust). A particular design, which may operate in the visible and infrared regions, utilizes a small array of photodetectors (such as PIN photodiodes) and electronic correlator circuits identifying correlations in photocurrent fluctuations of neighboring detectors. It is shown that the normalized cross-correlation coefficients will be significant, even in the presence of a strong incoherent (e.g., solar radiation) background, provided the coherent radiation degeneracy parameter (number of photoelectrons generated by the detector during the coherence-time interval) exceeds the ratio of the background to signal intensities. This condition, which should not be difficult to achieve in realistic situations, ensures that the coherent signal is larger than the shot noise due to the background.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"717 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133817335","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
A Graphene Based Metasurface for Transmittive-type Linear to Circular Polarization Converter with Tunable Characteristics 具有可调谐特性的透射型线圆偏振变换器石墨烯基超表面
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560544
S. Ghosh, Santanu Das, Somak Bhattacharyya
{"title":"A Graphene Based Metasurface for Transmittive-type Linear to Circular Polarization Converter with Tunable Characteristics","authors":"S. Ghosh, Santanu Das, Somak Bhattacharyya","doi":"10.23919/URSIGASS51995.2021.9560544","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560544","url":null,"abstract":"An ultrathin ($simlambda/11.11$) graphene-based metasurface polarization converter has been discussed in this report. The proposed device is a compact two-layered structure having a periodicity of $simlambda/14.28$. A linearly polarized (LP) electromagnetic wave gets converted to a circularly polarized (CP) wave when it passes through the proposed metasurface between 3 THz and 3.5 THz. The Stokes parameters are calculated to validate the circularly polarized nature of the transmitted wave. The characteristics is tunable in nature owing to the change of applied bias to the graphene layer.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115183020","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
ASKAP: From Commissioning to Operations ASKAP:从调试到运营
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560526
V. Moss, M. Whiting, A. W. Hotan, D. Bock, K. Bannister
{"title":"ASKAP: From Commissioning to Operations","authors":"V. Moss, M. Whiting, A. W. Hotan, D. Bock, K. Bannister","doi":"10.23919/URSIGASS51995.2021.9560526","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560526","url":null,"abstract":"The Australian Square Kilometre Array Pathfinder (ASKAP) is an SKA precursor located in the Murchi-son region of Western Australia. This 36-antenna array utilises innovative phased-array-feeds (PAFs) to provide a wide field-of-view, dramatically increasing the survey capabilities of the telescope. It is currently in the process of transitioning from commissioning into full operations, which is the focus of the overview presented here.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115580365","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
Hybridized Contrast Source Inversion Method 杂化对比源反演方法
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560551
Serhat Dinleyen, H. A. Ülkü
{"title":"Hybridized Contrast Source Inversion Method","authors":"Serhat Dinleyen, H. A. Ülkü","doi":"10.23919/URSIGASS51995.2021.9560551","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560551","url":null,"abstract":"A contrast source inversion based method, which hybridizes the cross-correlated contrast source inversion method (CC-CSIM) and multiplicative regularized contrast source inversion method (MR-CSIM) by applying them consecutively, is proposed for the solution of inverse scattering problems. The proposed method, called hybridized contrast source inversion method (H-CSIM), benefits the effective properties of MR-CSIM and CC-CSIM. A numerical example that demonstrates the robustness to noise, improved reconstruction accuracy, and convergence properties of the proposed method is presented.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115662647","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
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