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2011 XXXth URSI General Assembly and Scientific Symposium最新文献

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Observatory report for the UK 英国天文台报道
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6051241
R. Davis
{"title":"Observatory report for the UK","authors":"R. Davis","doi":"10.1109/URSIGASS.2011.6051241","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6051241","url":null,"abstract":"As UK representative for commission J I will give a report on radio astronomy in the UK. This will be centred on eMERLIN and JBO with further reports from Lord's Bridge Cambridge and SKA reports from Manchester, Cambridge and Oxford. If time permits then there will be a report on millimeter astronomy.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125985613","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
Examining lightning channel electrical properties with time domain fractal lightning modeling 用时域分形闪电模型研究闪电通道电学特性
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050741
B. Carlson, C. Liang, N. Lehtinen, Morris B. Cohen, D. Lauben, U. Inan
{"title":"Examining lightning channel electrical properties with time domain fractal lightning modeling","authors":"B. Carlson, C. Liang, N. Lehtinen, Morris B. Cohen, D. Lauben, U. Inan","doi":"10.1109/URSIGASS.2011.6050741","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050741","url":null,"abstract":"The electrical properties of the lightning channel are determined by a complex interplay of dielectric breakdown, plasma heating, expansion, and cooling. These details are observable through their effect on the channel current and electromagnetic wave emissions. This suggests that electromagnetic observations of lightning can be used to study channel physics and behavior.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122268928","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
Design and realization of ultra wide-band implant antenna for biotelemetry systems 生物遥测系统超宽带植入天线的设计与实现
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6051320
F. Zengin, Eren Akkaya, B. Turetken, S. E. San
{"title":"Design and realization of ultra wide-band implant antenna for biotelemetry systems","authors":"F. Zengin, Eren Akkaya, B. Turetken, S. E. San","doi":"10.1109/URSIGASS.2011.6051320","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6051320","url":null,"abstract":"The aim of this study is to design of a small size implantable antenna involving Industrial, Scientific and Medical (ISM) (2.4 GHz-2.48 GHz) band. The goal of designing antenna is to obtain physiological information pertaining to person. Simulation measurements of antenna were obtained in body ambient by making the design of antenna with CST Studio Suite programme. Then, in vitro measurements were performed on antenna by making an artificial material, which shows electrical features of human skin tissue, to verify measurement results. Obtained measurement results and simulative results are in accordance.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127910115","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
An approach to finding the correct branch from the forest of possible solutions for extracted effective material parameters 一种从提取的有效材料参数的可能解林中找到正确分支的方法
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050387
O. Luukkonen, S. Maslovski, S. Tretyakov
{"title":"An approach to finding the correct branch from the forest of possible solutions for extracted effective material parameters","authors":"O. Luukkonen, S. Maslovski, S. Tretyakov","doi":"10.1109/URSIGASS.2011.6050387","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050387","url":null,"abstract":"In the classical Nicolson-Ross-Weir electromagnetic material parameter extraction technique the effective material parameters are obtained through reflection and transmission measurements of a planar material sample. One of the advantages of this technique is that it provides the result over a broad frequency band with just one measurement. This technique, however, does not provide us unambiguous results of the effective permittivity and permeability but the correct solution needs to be found through an additional deduction process. Here we present a derivative of the Nicolson-Ross-Weir extraction technique that can overcome this problem related to the infinitely many branches of the solution.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127958216","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
Assessment of evaporation duct propagation simulation 蒸发管道传播模拟的评估
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050871
I. Levadnyi, V. Ivanov, V. Shalyapin
{"title":"Assessment of evaporation duct propagation simulation","authors":"I. Levadnyi, V. Ivanov, V. Shalyapin","doi":"10.1109/URSIGASS.2011.6050871","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050871","url":null,"abstract":"The evaporation duct strongly influence microwave radars and communication systems. For evaluation of their performance in such environment combination of split-step parabolic equation and Monin-Obukhov similarity theory are usual approach. There are several variants of semiempirical functions used in the similarity theory which leads to different models for evaporation duct height estimation. Five models were analyzed in this paper and evaporation duct height derived from them were compared with ”effective” duct height obtained minimizing the difference between measured propagation factor and split-step parabolic equation calculation for varying evaporation duct height by least-square method. The best result in average was showed by ECMWF model and for other models ”effective” evaporation duct heights was lower then obtained from bulk measurements. It means that combination of these models and split-step parabolic equation method leads to overestimation of propagation factor values.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132348351","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: 6
Dual frequency reconfigurable microstrip antenna using varactor diodes 使用变容二极管的双频可重构微带天线
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050298
M. S. Nishamol, C. Aanandan, P. Mohanan, K. Vasudevan
{"title":"Dual frequency reconfigurable microstrip antenna using varactor diodes","authors":"M. S. Nishamol, C. Aanandan, P. Mohanan, K. Vasudevan","doi":"10.1109/URSIGASS.2011.6050298","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050298","url":null,"abstract":"A varactor controlled electronically reconfigurable dual frequency microstrip antenna is presented. Dual frequency operation is realized by embedding an X-slot in a rectangular patch. High tuning ranges of 26.3% and 15.3% are realized for the two resonant frequencies respectively, when the bias voltage is varied from 0 to 16V. This design has an added advantage of size reduction up to 77% and 64% for the two resonant frequencies compared to standard rectangular patch. A maximum band width of 2.26% and 2.36% for the two frequencies with an operating frequency ratio varying in the range 1.156 to 1.279 is observed.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130098594","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: 12
A key generation technique using array antenna beam selection 阵列天线波束选择的关键生成技术
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050500
S. Aikawa, Masahiko Maeda, T. Iwai
{"title":"A key generation technique using array antenna beam selection","authors":"S. Aikawa, Masahiko Maeda, T. Iwai","doi":"10.1109/URSIGASS.2011.6050500","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050500","url":null,"abstract":"Recently, secret key generation schemes for wireless communication systems using propagation performance are researched. RSSI, signal strength indications received at AP (Access Point) and UT (User Terminal) are same value in TDD systems because of reciprocity theorem, and are controlled by the array antenna pattern. However, RSSI at TP (Tapping Point) is not same as RSSI at AP or UT that depend on their location. The secret keys are generated from binarized RSSIs. This paper describes a method for improving the probability of key agreement between AT and UT by using array antennas control.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130200899","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
Confining the angular distribution of TGF emission 限制TGF发射的角度分布
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050936
T. Gjesteland, N. Ostgaard, A. Collier, B. Carlson, M. Cohen, N. Lehtinen
{"title":"Confining the angular distribution of TGF emission","authors":"T. Gjesteland, N. Ostgaard, A. Collier, B. Carlson, M. Cohen, N. Lehtinen","doi":"10.1109/URSIGASS.2011.6050936","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050936","url":null,"abstract":"We present the first constraints on the TGF emission cone, based on accurately geolocated TGFs. The distribution of the observation angles for 106 TGFs are compared to Monte Carlo simulations. We find that TGF emissions within an isotropic half angle >30° can generate the observations. In addition, 36 events are used for spectral analysis. The result is a significant softening of the TGF energy spectrum for large observation angles, which is consistent with a TGF emission half angle <40°. The constraints 30° −40° indicates that the electrons which produce TGFs are accelerated in nearly vertical electric fields.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130429418","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
Developments of optical frequency standards at NICT and all-optical comparison against a remote clock in University of Tokyo using 60km fiber link NICT光频率标准的发展以及与东京大学使用60公里光纤链路的远程时钟的全光比较
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050326
Y. Koyama, M. Fujieda, H. Hachisu, T. Ido, R. Kojima, M. Kumagai, Ying Li, K. Matsubara, S. Nagano, N. Shiga, A. Yamaguchi
{"title":"Developments of optical frequency standards at NICT and all-optical comparison against a remote clock in University of Tokyo using 60km fiber link","authors":"Y. Koyama, M. Fujieda, H. Hachisu, T. Ido, R. Kojima, M. Kumagai, Ying Li, K. Matsubara, S. Nagano, N. Shiga, A. Yamaguchi","doi":"10.1109/URSIGASS.2011.6050326","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050326","url":null,"abstract":"At National Institute of Information and Communications Technology (NICT), we have lately developed a lattice clock using 87Sr atoms as well as a single ion clock based on 40Ca+. Besides the comparison of the two atomic standards inside the institute, all-optical fiber-link to transfer frequency standards to the University of Tokyo (UT) has been developed to evaluate the uncertainty and stability of our standards by referring the state-of-the-art lattice clock locating in UT. The initial evaluations have resulted in the relative stability of 10−16 level, clearly showing the differential frequency of 4–5Hz mainly caused by the 45m difference of the elevation.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134146173","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
Modeling and reconstruction in a 3D microwave imaging system 三维微波成像系统的建模与重构
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050448
A. Fhager, J. Koster, Tonny Rubok, M. Persson
{"title":"Modeling and reconstruction in a 3D microwave imaging system","authors":"A. Fhager, J. Koster, Tonny Rubok, M. Persson","doi":"10.1109/URSIGASS.2011.6050448","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050448","url":null,"abstract":"In this paper we discuss the design and modeling of a 3D system for microwave imaging. The antenna system consists of 32 monopoles in a cylindrical configuration. A FDTD model of the system is used in the imaging reconstruction algorithm. Here we show a comparison of the data generated from the numerical FDTD model with measured data, as well as imaging of a simple target using this system. The agreement in the model is good and the imaging of a test object is successful.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133901912","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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