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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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Microwave Dielectric Property Based Stage Detection of Skin Cancer 基于微波介电特性的皮肤癌分期检测
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560438
Cemanur Aydinalp, Sulayman Joof, T. Yilmaz
{"title":"Microwave Dielectric Property Based Stage Detection of Skin Cancer","authors":"Cemanur Aydinalp, Sulayman Joof, T. Yilmaz","doi":"10.23919/URSIGASS51995.2021.9560438","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560438","url":null,"abstract":"Inherent discrepancy of dielectric properties between biological tissues has drawn considerable interest for the last 30 years. Open-ended coaxial probe is one of the promising methods to measure dielectric properties due to the non-destructive and broadband measurement characteristics. The advances in this method will improve the diagnosis and treatment processes in the medical industry. The aim of this study is not only to determine skin tumors but also to identify the cancer stages with open-ended coaxial probes. This will aid rapid an inexpensive diagnosis of skin cancer. To this end, we simulated a 2.2mm diameter open-ended coaxial probe, which is commercially available, with three-layered breast skin tissue and tumors with fifteen different volumes using Altair FEKO simulation software. The S-parameters of each configuration is simulated in the range of 500 MHz to 2GHz. Based on the simulated S-parameters, the results indicate that the first stage and healthy tissue shows a difference of 11.46 % at 1.5GHz. Similarly, there is a difference of about 39.48 % between the second and third stage. Skin cancer is considered critical at the third stage, therefore having a distinctive difference between dielectric properties and thus between the S-parameter response when the probe is terminated with second and the third stage tumor tissue will help in the detection of early stage skin cancer.","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":"129592395","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
An Improved Rectangular Waveguide Thermal Isolator for Radio Astronomy Applications 一种用于射电天文学的改进矩形波导热隔离器
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560237
G. Montisci, G. Valente, G. Muntoni, P. Marongiu, T. Pisanu
{"title":"An Improved Rectangular Waveguide Thermal Isolator for Radio Astronomy Applications","authors":"G. Montisci, G. Valente, G. Muntoni, P. Marongiu, T. Pisanu","doi":"10.23919/URSIGASS51995.2021.9560237","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560237","url":null,"abstract":"We present the design of a thermal isolator, based on a simple gap in a standard rectangular waveguide with external circular profile. The proposed solution allows to achieve high return loss and low insertion loss by a suitable selection of the of the external radius of the waveguide circular profile, which determines the waveguide wall thickness. High robustness to misalignment is obtained, improving the performance of a recently published work in the same topic.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"220 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":"127527021","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
Loop Proximity Effects in Three-Loop Antenna Systems 三环天线系统中的环邻近效应
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560196
C. Hynes, R. Vaughan
{"title":"Loop Proximity Effects in Three-Loop Antenna Systems","authors":"C. Hynes, R. Vaughan","doi":"10.23919/URSIGASS51995.2021.9560196","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560196","url":null,"abstract":"Three-loop antenna systems (TLASs) are one of the few sensors with the ability to simultaneously detect all of the components of the electromagnetic field. The theory of TLASs ignores the presence of the other orthogonal loops and assumes that the response is that of a dual-loaded loop in isolation. This paper investigates the loop proximity effects for the cases of plane wave and centrally located dipole moment sources, as a function loop wire radius. It is shown through simulations that the responses of the TLAS sensor are unaffected by the presence of the other loops when considering just the magnetic field component of the plane wave and the magnetic dipole source. However, the TLAS reponses to the electric field component of the plane wave and the electric dipole moment can be significantly affected.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"8 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":"129965341","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
Numerical Analysis of Multifetal Exposure to Radiofrequency Electromagnetic Fields 多胎暴露于射频电磁场的数值分析
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560310
Chen Zhang, Congsheng Li, Tongning Wu
{"title":"Numerical Analysis of Multifetal Exposure to Radiofrequency Electromagnetic Fields","authors":"Chen Zhang, Congsheng Li, Tongning Wu","doi":"10.23919/URSIGASS51995.2021.9560310","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560310","url":null,"abstract":"To numerically assess the multifetal exposure to radiofrequency fields (20 to 3600 MHz), one twin-fetal model was reconstructed and was merged to an adult female model to form the fetus-pregnant model. Numerical simulations using plane-wave revealed that the female adult was always significantly exposed compared to the fetuses for the surveyed frequency band. At lower frequencies, the twin fetuses were homogeneously exposed but the whole-body dosimetric difference could be as high as 270% at higher frequencies.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"34 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":"132181545","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
GPS positioning accuracy during the 2016 September and 2010 August campaigns at the SURA heater 2016年9月和2010年8月在SURA加热器上的GPS定位精度
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560199
Y. Yasyukevich, S. Syrovatskii, A. Padokhin, V. Frolov, A. Vesnin, D. Zatolokin, G. Kurbatov, R. Zagretdinov, A. V. Pershin, A. Yasyukevich
{"title":"GPS positioning accuracy during the 2016 September and 2010 August campaigns at the SURA heater","authors":"Y. Yasyukevich, S. Syrovatskii, A. Padokhin, V. Frolov, A. Vesnin, D. Zatolokin, G. Kurbatov, R. Zagretdinov, A. V. Pershin, A. Yasyukevich","doi":"10.23919/URSIGASS51995.2021.9560199","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560199","url":null,"abstract":"We have conducted ionosphere heating experiments using HF radiation of SURA facility in August of 2010 and in September of 2016. We analyzed GPS positioning accuracy during the experiments. Positioning errors were estimated for 14 GPS receivers located at various distance, from just at the facility up to more than 1000 km from the facility. Data show that there were no noticeable positioning errors for both precise point positioning (PPP) and standard single-frequency modes.","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":"130956580","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
Direct-path Delay Estimation under Closely-spaced Multipath Interference 近间隔多径干扰下的直接路径延迟估计
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560267
Wentao Wang, Yuyao Shen, Yongqing Wang
{"title":"Direct-path Delay Estimation under Closely-spaced Multipath Interference","authors":"Wentao Wang, Yuyao Shen, Yongqing Wang","doi":"10.23919/URSIGASS51995.2021.9560267","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560267","url":null,"abstract":"For direct sequence spread spectrum (DSSS) signal, the minimum mean square error (MMSE) algorithms based on reiterative inverse filters have good delay resolution under closely-spaced multipath interference. However, the limited density of the correlator function dictionary leads to a model error of the filter. Under the inexact model, the performance of delay estimation decreases. To address this problem, we add a group of correction parameters into the dictionary matrix and estimate them in the reiterative filtering. Based on the sparsity of correction parameters, a threshold decision is adopted to sift the parameters that need to be estimated by maximum likelihood (ML) search. The parameters that fail to pass the threshold are set to zero. Simulation results show that, compared with least squares (LS) and MMSE algorithms, the proposed algorithm can improve the performance of delay estimation.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"8 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":"130419405","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
User Selection based on Inter-channel Interference for Massive MIMO under Line-of-sight Propagation 视距传播下基于信道间干扰的大规模MIMO用户选择
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560387
Rafael S. Chaves, E. Çetin, Markus V. S. Lima, W. Martins
{"title":"User Selection based on Inter-channel Interference for Massive MIMO under Line-of-sight Propagation","authors":"Rafael S. Chaves, E. Çetin, Markus V. S. Lima, W. Martins","doi":"10.23919/URSIGASS51995.2021.9560387","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560387","url":null,"abstract":"Massive multiple-input multiple-output (MIMO) is seen as a key enabler for next-generation wireless communication systems. Increased throughput afforded by massive MIMO, however, may severely degrade when the number of users served by a single base station increases, calling for user scheduling algorithms. To deal with this problem, a new user selection algorithm, called inter-channel interference-based selection (ICIBS), is proposed. ICIBS drops those users that induce the highest interference to the remaining users. Simulations show that selecting users with ICIBS significantly improves the throughput, outperforming state-of-the-art user selection algorithms.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"140 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":"123346107","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
Direct Solver Based on the Multilevel Nonuniform Grid Approach for Quasi-Planar Electromagnetic Scattering Problems 基于多层非均匀网格法的准平面电磁散射问题直接求解器
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560292
E. Chernokozhin, A. Boag
{"title":"Direct Solver Based on the Multilevel Nonuniform Grid Approach for Quasi-Planar Electromagnetic Scattering Problems","authors":"E. Chernokozhin, A. Boag","doi":"10.23919/URSIGASS51995.2021.9560292","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560292","url":null,"abstract":"A direct solver for quasi-planar electromagnetic scattering problems is developed. The algorithm consists of a multilevel domain decomposition, a rank revealing procedure (RRP), and a direct solution of the resulting compressed system of linear algebraic equations. The RRP is performed step by step from the bottom to top levels and is based on the singular value decomposition (SVD) using the interpolation grids of the Multilevel Nonuniform Grid (MLNG) approach. The efficiency of the solver is demonstrated by numerical experiments.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"91 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":"123414738","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
Non-invasive real time monitoring of cellular modifications with microwave dielectric spectroscopy at the single cell level 用微波介电光谱在单细胞水平上对细胞修饰进行无创实时监测
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560506
K. Grenier, W. Chen, D. Dubuc
{"title":"Non-invasive real time monitoring of cellular modifications with microwave dielectric spectroscopy at the single cell level","authors":"K. Grenier, W. Chen, D. Dubuc","doi":"10.23919/URSIGASS51995.2021.9560506","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560506","url":null,"abstract":"Microwave dielectric spectroscopy constitutes an attractive sensing technique for cellular analysis. One key feature is its ability to non-invasively and dielectrically monitor cellular modifications at the single cell level. The proposed microwave sensor dedicated to single cell measurement includes a mechanical trap, which permits to apply on individual cells whatever liquid-based environment. The dielectric consequences on the cell due to the application of saponine at 0.02% is recorded every two minutes, demonstrating the possibility to reach dielectric transformation kinetic of cells. This proof of concept opens the door to the non-invasive and nondestructive evaluation of biological reactions at the cellular level.","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":"126198530","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
Physical-aware Radar Image Synthesis with Projective Network 基于投影网络的物理感知雷达图像合成
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560559
Qian Song, F. Xu, Xiao Xiang Zhu
{"title":"Physical-aware Radar Image Synthesis with Projective Network","authors":"Qian Song, F. Xu, Xiao Xiang Zhu","doi":"10.23919/URSIGASS51995.2021.9560559","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560559","url":null,"abstract":"This paper proposed a new network module named as projection network, which explicitly combined radar's projection process with trainable network. It assumes that each 2D radar cross section (RCS) map is a projection of a 3D RCS map. And it models the projection mechanism as a differentiable layer, so that it can be integrated with other neural network layers, such as convolutional and pooling layers. The proposed model is consistent with radar projection process, hence effects such as layover is considered. It is designed and used specifically for radar applications. This paper applied the proposed network on radar image synthesis, and the simulation results showed great potential of projective network.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"22 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":"122201302","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
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