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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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Enhanced chipless RFID with Van-Atta and Quantile regression 基于Van-Atta和分位数回归的增强无芯片RFID
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560214
M. Donelli, M. Manekiya, S. Menon
{"title":"Enhanced chipless RFID with Van-Atta and Quantile regression","authors":"M. Donelli, M. Manekiya, S. Menon","doi":"10.23919/URSIGASS51995.2021.9560214","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560214","url":null,"abstract":"In this work a chipless RFID tag based on a surface wave impedance (SIW) and a Van-Atta array is presented and assessed. The Van-Atta array it is aimed to reflect the impinging electromagnetic wave on every angle of incidence. The information is encoded in a the compact set of SIW resonators. To improve the detection capabilities and improve the signal to noise ratio, a quantile regression method to enhance the system performance has been considered. A tag prototype has been designed, fabricated, and experimental assessed. The obtained results are quite promising and they demonstrate the potentialities of the proposed chipless tag.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"5 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":"116531855","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
Early Results from the Ionospheric Sounding Mode Using Chirp Ionosondes of Opportunity for the HamSCI Personal Space Weather Station 利用机遇号啁啾电离层探空仪对HamSCI个人空间气象站电离层探测模式的初步结果
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560441
D. Joshi, N. Frissell, W. Liles, J. Vierinen, E. Miller
{"title":"Early Results from the Ionospheric Sounding Mode Using Chirp Ionosondes of Opportunity for the HamSCI Personal Space Weather Station","authors":"D. Joshi, N. Frissell, W. Liles, J. Vierinen, E. Miller","doi":"10.23919/URSIGASS51995.2021.9560441","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560441","url":null,"abstract":"The objective of the Ham Radio Science Citizen Investigation (HamSCI) Personal Space Weather Station (PSWS) project is to develop a distributed array of ground-based multi-instrument nodes capable of remote sensing the geospace system. This system is being designed with the intention of distribution to a large number of amateur radio and citizen science observers. This will create an unprecedented opportunity to probe the ionosphere at finer resolution in both time and space as all measurements will be collected into a central database for coordinated analysis. Individual nodes are being designed to service the needs of the professional space science researcher while being cost-accessible and of interest to amateur radio operators and citizen scientists. At the heart of the HamSCI PSWS will be a high performance 0.1–60 MHz software defined radio (SDR) [1] with GNSS-based precision timestamping and frequency reference. This SDR is known as the TangerineSDR and is being developed by the Tucson Amateur Packet Radio (TAPR) amateur radio organization. The primary objective of PSWS system is to gather observations to understand the short term and small spatial scale ionospheric variabilities in the ionosphere-thermosphere system. These variabilities are important for understanding a variety of geophysical phenomena such as Traveling Ionospheric Disturbances (TIDs) [2], Ionospheric absorption events, geomagnetic storms and substorms. We present early results suggesting signature of Traveling Ionospheric Disturbances (TIDs) from an ionospheric sounding mode that we intend to implement on the PSWS system, currently implemented on an Ettus N200 Universal Software Radio Peripheral (USRP) using the open source GNU Chirpsounder data collection and analysis code.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"5 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":"127640351","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
Modeling and Harnessing Wave Propagation in Nonlocal and Non-Hermitian Media via Extended Transformation Optics 扩展变换光学在非局域和非厄米介质中的波传播建模和控制
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560577
M. Moccia, G. Castaldi, V. Galdi
{"title":"Modeling and Harnessing Wave Propagation in Nonlocal and Non-Hermitian Media via Extended Transformation Optics","authors":"M. Moccia, G. Castaldi, V. Galdi","doi":"10.23919/URSIGASS51995.2021.9560577","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560577","url":null,"abstract":"Nonlocal and non-Hermitian effects are becoming increasingly relevant in the modeling and engineering of metama-terials. Here, we review some strategies for extending the transformation-optics framework so as to enable the analysis and synthesis of these effects, while retaining the powerful and insight-providing geometrical interpretation that characterizes the conventional formulation.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"3 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":"128011462","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
VLF radio signal perturbations during two recent solar eclipses observed from a VLF receiving station, Cooch Behar, India 在印度Cooch Behar的VLF接收站观测到的最近两次日食期间的VLF无线电信号扰动
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560244
B. Das, S. Pal, P. K. Haldar
{"title":"VLF radio signal perturbations during two recent solar eclipses observed from a VLF receiving station, Cooch Behar, India","authors":"B. Das, S. Pal, P. K. Haldar","doi":"10.23919/URSIGASS51995.2021.9560244","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560244","url":null,"abstract":"Effects of two recent solar eclipses of December 2019 and June 2020 on the Very Low Frequency (VLF) radio signal amplitudes, observed from a single receiving station at Cooch Behar (CHB), India, have been presented in this paper. Signal amplitudes of VLF transmitters such as VTX (18.2 kHz), NWC (19.8 kHz), JJI (22.2 kHz), and DHO (23.4 kHz) experienced both enhancement and reduction during the eclipse period. Depending on the eclipse obscuration over the propagation path, propagation distance, and frequency of the signal, increase and decrease of signal amplitudes were observed. The amplitude perturbation on the VLF signals was also opposite for the two eclipses on each propagation path. The possible reason behind the amplitude perturbations is the changes induced in the earth ionosphere waveguide during the solar eclipses and corresponding constructive or destructive interference that occurred between the waveguide modes of the received signal at each frequency.","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":"132671005","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
Antenna Position Estimation Through Sub-Sampled Exponential Analysis of Harmonically Related Input Signals 基于次采样指数分析的谐波相关输入信号天线位置估计
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560519
Ridalise Louw, Ferre Knaepkens, A. Cuyt, Wen-shin Lee, S. Wijnholds, D. D. De Villiers, Rina-Mari Weideman
{"title":"Antenna Position Estimation Through Sub-Sampled Exponential Analysis of Harmonically Related Input Signals","authors":"Ridalise Louw, Ferre Knaepkens, A. Cuyt, Wen-shin Lee, S. Wijnholds, D. D. De Villiers, Rina-Mari Weideman","doi":"10.23919/URSIGASS51995.2021.9560519","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560519","url":null,"abstract":"Accurate placement of elements in large antenna arrays is a difficult and costly process. We explore the use of the validated exponential analysis (VEXPA) technique that was previously formulated to solve a direction-of-arrival (DOA) estimation problem, to find the antenna element positions in an array after the installation phase, so that cost-savings can be realised during placement of the antenna elements. Measurements are taken from harmonically related input signals transmitted from an Unmanned Aerial Vehicle (UAV) for which the position in the sky is known. It is shown how the UAV's zenith angle can be manipulated to generate parameters required for VEXPA's de-aliasing step. A simple simulation illustrates the functioning of the proposed method.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"7 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":"133156220","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
Scattering of an inhomogeneous wave impinging on parallel stratified cylinders 撞击平行分层圆柱体的非均匀波的散射
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560332
L. Dinia, S. Batool, M. Nisar, F. Frezza, F. Mangini
{"title":"Scattering of an inhomogeneous wave impinging on parallel stratified cylinders","authors":"L. Dinia, S. Batool, M. Nisar, F. Frezza, F. Mangini","doi":"10.23919/URSIGASS51995.2021.9560332","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560332","url":null,"abstract":"The interplay between an inhomogeneous plane wave and unlimited parallel stratified cylinders is presented. A meticulous theoretical approach is employed to show the relative electromagnetic interaction. The generalized Vector Cylinder Harmonics (VCH) expansion application is used for investigating the electromagnetic scattering by a series of stratified cylinders. he commonly named complex-angle formalism is used in the exact mathematical model to depict the current scenario. This approach allows the obtaining of the superposition of the VCH and the Foldy-Lax Multiple Scattering Equations (FLMSE) for considering the effect of multi-scattering between the stratified cylinders.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"71 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":"133318005","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
Sampling approach for the discretization of scattering operator in inhomogeneous medium 非均匀介质中散射算子离散化的采样方法
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560296
M. A. Maisto, R. Solimene, R. Pierri
{"title":"Sampling approach for the discretization of scattering operator in inhomogeneous medium","authors":"M. A. Maisto, R. Solimene, R. Pierri","doi":"10.23919/URSIGASS51995.2021.9560296","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560296","url":null,"abstract":"In this paper, a subsurface imaging problem is addressed. In particular, the focus here is to determine a strategy to collect the spatial data allowing to reduce the number of measurement points compared to more common approach. The idea is to sample the scattered field in order to leave unchanged the more significant singular values of the corresponding scattering operator. The proposed strategy results into a non-uniform arrangement of measurement points.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"6 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":"133719420","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
Ionospheric Disturbances and Their Impacts on HF Radio Wave Propagation 电离层扰动及其对高频无线电波传播的影响
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560548
Q. Guo, L. Chernogor, K. Garmash, Yiyang Luo, V. Rozumenko, Yu. Zheng
{"title":"Ionospheric Disturbances and Their Impacts on HF Radio Wave Propagation","authors":"Q. Guo, L. Chernogor, K. Garmash, Yiyang Luo, V. Rozumenko, Yu. Zheng","doi":"10.23919/URSIGASS51995.2021.9560548","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560548","url":null,"abstract":"The multi-frequency multipath observations of temporal variations in the Doppler spectra and signal amplitudes of HF radio waves reflected from the ionosphere, which accompanied ionospheric disturbances caused by an ionospheric storm, an earthquake, and a solar eclipse, are described. Aperiodic and quasi-periodic disturbances have been detected in the radio signal and ionospheric parameters.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"3 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":"134012607","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
Link Budget Analysis for the Modeling of GNSS-R Sea Surface Returns in Far-from-Specular Acquisition Geometries GNSS-R海面远镜面捕获几何模型的链路预算分析
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560646
G. Di Martino, A. Di Simone, G. Franceschetti, A. Iodice, D. Riccio, G. Ruello
{"title":"Link Budget Analysis for the Modeling of GNSS-R Sea Surface Returns in Far-from-Specular Acquisition Geometries","authors":"G. Di Martino, A. Di Simone, G. Franceschetti, A. Iodice, D. Riccio, G. Ruello","doi":"10.23919/URSIGASS51995.2021.9560646","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560646","url":null,"abstract":"For the analysis of sea surface using Global Navigation Satellite System-Reflectometry (GNSS-R), Geometrical Optics (GO) is typically adopted for modeling scattering around the specular reflection direction, where conventional GNSS-R receivers operate. However, the exploitation of GNSS-R for maritime surveillance applications, e.g., ship detection, is feasible in far-from-specular acquisition geometries, where the validity of GO is questionable. In this paper, we present the results of a link budget analysis for the sea surface return in arbitrary viewing geometries. The study is aimed at comparing GO with a more accurate closed-form bistatic two-scale model, named BA-PTSM, for the simulation of GNSS-R signals in acquisition geometries other than the conventional forward-scattering one. Numerical results show that a reliable simulation of airborne GNSS-R signals in far-from-specular acquisition geometries requires sea surface scattering models more accurate than GO, e.g., BA-PTSM.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"92 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":"134271680","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
Artificial Neural Network Synthesis Based Approach For Superdirective Antenna Arrays Design 基于人工神经网络综合的超指令天线阵列设计方法
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560327
Abdellah Touhami, A. Sharaiha, S. Collardey
{"title":"Artificial Neural Network Synthesis Based Approach For Superdirective Antenna Arrays Design","authors":"Abdellah Touhami, A. Sharaiha, S. Collardey","doi":"10.23919/URSIGASS51995.2021.9560327","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560327","url":null,"abstract":"In this work, a novel technique is proposed to design superdirective antenna arrays using artificial neural network (ANN). A radial basis function neural network model (RBNN) is developed and used to determine the optimal inter-elements separating distance and its corresponding excitation coefficients for a single frequency. The developed model is deployed for designing a three stacked S-shaped monopole antenna array. The simulation result show that a maximal directivity of 10 dBi for a separation distance of 0.16 λ, was achieved.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"20 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":"125221903","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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