发布求助
文献互助 智能选刊 最新文献

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

筛选
英文 中文
Study and Characterization of a Two-Way Satellite Time and Frequency Transfer Link using Software-Defined Radio solutions to both code and carrier-phase signals 使用软件定义无线电解决方案对编码和载波相位信号进行双向卫星时间和频率传输链路的研究和表征
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560568
J. Achkar, B. Chupin, Y-J. Huang, M. Fujieda, Dirk Piester, E. Staliuniene, F. Arias
{"title":"Study and Characterization of a Two-Way Satellite Time and Frequency Transfer Link using Software-Defined Radio solutions to both code and carrier-phase signals","authors":"J. Achkar, B. Chupin, Y-J. Huang, M. Fujieda, Dirk Piester, E. Staliuniene, F. Arias","doi":"10.23919/URSIGASS51995.2021.9560568","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560568","url":null,"abstract":"This paper presents a complete study and characterization of a two-way satellite time and frequency transfer link between two remote earth stations equipped with analog modems and software-defined radio receivers driven by atomic clocks. Techniques based on code-phase and carrier-phase measurements were developed to compute time and frequency deviations between these clocks. A comparison of different methods using conventional bandwidth, broadband, carrier-phase information and software-defined radio solution is given. In addition, the paper is completed by a description of calibration aspects, more specifically on the software-defined radio link, an essential step in calculating the differences between remote time scales with very high accuracy, reaching a level of uncertainty of the order of 0.5 nanosecond.","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":"132391122","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
Active Scattering Cancellation Using a Microstrip Antenna Element 使用微带天线元件的主动散射抵消
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560210
S. Sengupta, Henry Council, D. Jackson, D. Onofrei, Vani Vellanki
{"title":"Active Scattering Cancellation Using a Microstrip Antenna Element","authors":"S. Sengupta, Henry Council, D. Jackson, D. Onofrei, Vani Vellanki","doi":"10.23919/URSIGASS51995.2021.9560210","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560210","url":null,"abstract":"A technique for reducing the scattering (i.e., radar cross section) of a given object in a fixed direction is presented, which makes use of a radiating microstrip patch antenna element. The system is designed so that the radiation from the patch cancels a radar signal reflected from the object in a specified direction at the carrier frequency of the radar signal, and therefore reduces the time-varying radar signal that is scattered from the object in the specified direction for an incident time-varying radar pulse that arrives from a known direction. Applications include spectral coexistence and EMI reduction from radars.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"18 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":"132399817","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
Identification of Magnetic Null on Reconnection 19 September 2015 Event using Magnetospheric Multiscale Mission 利用磁层多尺度任务识别2015年9月19日重联事件的磁零
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560212
S. Ekawati, D. Cai
{"title":"Identification of Magnetic Null on Reconnection 19 September 2015 Event using Magnetospheric Multiscale Mission","authors":"S. Ekawati, D. Cai","doi":"10.23919/URSIGASS51995.2021.9560212","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560212","url":null,"abstract":"Magnetic nulls referred to a region with vanishing magnetic fields play an essential role in energy conversion and particle acceleration during magnetic reconnections. Moreover, they are also useful tools to characterize the complex magnetic topologies and are essential in three-dimensional (3D) magnetic reconnection. In this paper, we apply the linear interpolation methods to derive the null positions of the dayside reconnection Electron Diffusion Region (EDR) on 19 September 2015 using Magnetospheric Multiscale (MMS) mission spacecraft. The number of the signs of the real part of eigenvalues determines the magnetic field topology nearby this null. The change of the topology can be related to the occurrence of bifurcation or magnetic reconnection. Here, we report the first in situ measurement that the field topology of magnetic nulls changes from B type to A type at around 07:43:30.4 associated with the reported EDR event.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"35 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":"131762512","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
Analysis of the Radial PML in Cylindrical Finite Integration Technique Using a Hybrid Implicit-Explicit Update Scheme 基于隐式-显式混合更新方案的圆柱有限积分技术径向PML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/URSIGASS51995.2021.9560573
L. Kuen, R. Schuhmann
{"title":"Analysis of the Radial PML in Cylindrical Finite Integration Technique Using a Hybrid Implicit-Explicit Update Scheme","authors":"L. Kuen, R. Schuhmann","doi":"10.23919/URSIGASS51995.2021.9560573","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560573","url":null,"abstract":"We study the performance of the Perfectly Matched Layer (PML) boundary technique within a Finite Integration/Finite Differences method for the simulation of electromagnetic waves in structures with rotational symmetry. To solve the stability issues of PML in time-domain which have been reported in literature, we have previously introduced a hybrid implicit-explicit algorithm. It applies a stabilizing implicit update scheme for components within the PML region only, but reduces to the standard explicit leapfrog method in the main computational domain. For a so-called 2.5-D grid in ρz-coordinates, this algorithm is extended to the PML in the ρ-direction, and its stability and accuracy properties are analyzed. The results show that the radial ρ-PML has less influence on the stability of the time integration compared to the longitudinal z-PML. Thus, it can be operated using the same parameters as longitudinal PML or even using standard leapfrog integration.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"24 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":"132211751","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
Uncertainty Analysis on the Reconstruction of the Radiated Field in a Multiple Monopole Source Stirred Reverberation Chamber 多单极源搅拌混响室辐射场重构的不确定性分析
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560349
A. De Leo, G. Cerri, P. Russo, V. M. Primiani
{"title":"Uncertainty Analysis on the Reconstruction of the Radiated Field in a Multiple Monopole Source Stirred Reverberation Chamber","authors":"A. De Leo, G. Cerri, P. Russo, V. M. Primiani","doi":"10.23919/URSIGASS51995.2021.9560349","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560349","url":null,"abstract":"In this paper a statistical analysis on the measurement uncertainties related to the radiated emissions of an Equipment Under Test (EUT) is reported. The measurement environment is a Reverberation Chamber (RC), where the EUT is placed inside its working volume and the electric field is sampled close to the RC's metallic walls. From these measurements the free space emission of the EUT is reconstructed. The RC is equipped for the Multiple Monopole Source Stirring (MMSS) technique, which requires an array of monopole antennas placed onto the walls; therefore, in the present paper, the same antennas are used to sample the orthogonal component of the electric field radiated by the EUT. Two uncertainties mechanisms are analyzed: the position of the monopoles onto the walls and the direction of the monopole, that in the ideal scenario are perfectly orthogonal to the walls, but in a more realistic scenario, they could be oriented slightly in a different way.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"106 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":"133858875","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
Wearable Radio Frequency Loop Sensors for Monitoring Joint Kinematics 用于监测关节运动的可穿戴射频环路传感器
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560528
Vigyanshu Mishra, A. Kiourti
{"title":"Wearable Radio Frequency Loop Sensors for Monitoring Joint Kinematics","authors":"Vigyanshu Mishra, A. Kiourti","doi":"10.23919/URSIGASS51995.2021.9560528","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560528","url":null,"abstract":"We report an emerging wearable sensor technology that relies on radio frequency (RF) loops to enable seamless monitoring of human body kinematics in uncontrived settings. Two variants of this technology are discussed that consist of loops placed transversally and longitudinally upon the limbs to monitor flexion-only and combined flexion and rotation, respectively. The reported approach overcomes shortcomings in state-of-the-art motion capture, offering unprecedented opportunities for the future of healthcare, sports, gaming, and more.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"12 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":"132892022","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
Numerical method electromagnetic waves propagation problem in an inhomogeneous chiral media 非齐次手性介质中电磁波传播问题的数值方法
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560555
Y. Shestopalov, M. Snegur, E. Smolkin
{"title":"Numerical method electromagnetic waves propagation problem in an inhomogeneous chiral media","authors":"Y. Shestopalov, M. Snegur, E. Smolkin","doi":"10.23919/URSIGASS51995.2021.9560555","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560555","url":null,"abstract":"In this work, we study electromagnetic waves propagating in an inhomogeneous waveguide of circular cross section filled with a chiral medium. For the numerical solution of the problem, a Galerkin method is proposed. The results of numerical study of the spectrum of propagating surface waves of the considered open waveguide are presented.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"170 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":"132922805","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
Design and Verification of IR-UWB Localisation Sensor Node with Cavity-Backed Textile Antenna 基于腔背式纺织天线的IR-UWB定位传感器节点设计与验证
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560599
J. Verhaevert, D. Van Baelen, Quinten Van den Brande, S. Lemey, H. Rogier
{"title":"Design and Verification of IR-UWB Localisation Sensor Node with Cavity-Backed Textile Antenna","authors":"J. Verhaevert, D. Van Baelen, Quinten Van den Brande, S. Lemey, H. Rogier","doi":"10.23919/URSIGASS51995.2021.9560599","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560599","url":null,"abstract":"This paper handles the design and verification of a localisation sensor with a cavity-backed slot antenna. The sensor node uses a Decawave DW1000 chipset, together with a basic sensor, a microcontroller and a flash memory card. It is designed on a mechanically flexible Printed Circuit Board (PCB), where component edges and vias are aligned forming rigid lines. As antenna a Substrate Integrated Waveguide (SIW) design is proposed: a cavity-backed slot antenna combining vulcanised rubber foam and electrotextile. Impulse-Radio Ultra-Wideband (IR-UWB) localisation is analysed by the pulse deformation in the System Fidelity Factor (SFF) and the phase shift in the Distance Estimation Error (DEE). On-body measurements show that everything works fine.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"500 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":"132834189","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
Observation of the MF Broadcasting Wave Intensities on the Solar Eclipse 日食时中频广播波强度的观测
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560335
Tetsuo Fukami, R. Higashi, I. Nagano
{"title":"Observation of the MF Broadcasting Wave Intensities on the Solar Eclipse","authors":"Tetsuo Fukami, R. Higashi, I. Nagano","doi":"10.23919/URSIGASS51995.2021.9560335","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560335","url":null,"abstract":"The ionospheric D region generated by sunlight has great influence on the MF wave propagation. To investigate the response on the D region during the solar eclipse, we observed the MF broadcast wave intensities for two similar periods, the annular and the partial solar eclipse in Japan. As a result, more MF broadcasts were observed during the partial solar eclipse although the partial solar eclipse had more sunlight than the annular solar eclipse.","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":"132949894","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 Dask Distributed Radio Astronomy Reduction Framework 一个任务分布式射电天文学简化框架
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560409
S. Perkins, H. Bester, B. Hugo, J. Kenyon, O. Smirnov
{"title":"A Dask Distributed Radio Astronomy Reduction Framework","authors":"S. Perkins, H. Bester, B. Hugo, J. Kenyon, O. Smirnov","doi":"10.23919/URSIGASS51995.2021.9560409","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560409","url":null,"abstract":"Interferometric coherency measurements scale quadratically with the number of stations in the interferometer. This, combined with high spectro temporal resolution of the data necessitates the use of modern computing strategies such as MapReduce, and cluster computing frameworks to reduce data in tractable amounts of time. Frameworks such as Spark and Dask [1] lean towards a streaming, chunked, functional programming style with minimal shared state. Individual tasks processing chunks of data are flexibly scheduled on multiple cores and nodes. To process the quantities of data produced by contemporary radio telescopes such as MeerKAT, and future telescopes such as the SKA, radio astronomy codes must adapt to these paradigms. In what follows, we describe two Python libraries, dask-ms and codex-africanus, which enable the development of distributed High-Performance Radio Astronomy code.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"15 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":"133588115","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
首页 上一页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信