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2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)最新文献

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Primary-beam shape parameters of the upgraded GMRT 升级后的GMRT主波束形状参数
2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738257
S. Katore, Dhram V Lal
{"title":"Primary-beam shape parameters of the upgraded GMRT","authors":"S. Katore, Dhram V Lal","doi":"10.23919/URSIAP-RASC.2019.8738257","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738257","url":null,"abstract":"Giant Metrewave Radio Telescope is the world's most sensitive low-frequency radio interferometer and it is in the final stage of the upgrade. One of the key objectives of this upgrade is to improve sensitivity along with obtaining near seamless frequency coverage from 100 to 1500 MHz. As a part of this upgrade, new wideband feeds and digital backend with 400 MHz bandwidth capability have been put in place.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132807281","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
Using meteorological data for clear sky and cloud attenuation in Belgium and India 利用气象资料计算比利时及印度的晴空及云层衰减情况
2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738397
G. Rakshit, L. Quibus, D. Vanhoenacker-Janvier, A. Maitra
{"title":"Using meteorological data for clear sky and cloud attenuation in Belgium and India","authors":"G. Rakshit, L. Quibus, D. Vanhoenacker-Janvier, A. Maitra","doi":"10.23919/URSIAP-RASC.2019.8738397","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738397","url":null,"abstract":"Future High Throughput Satellite Communication Systems and Earth Observation Satellite Data Download foresee the use of frequencies in Ka band and above because those frequency bands offer advantages in terms of bandwidth and capacity. In that frequency range, the degradation due to the troposphere becomes important and the designers need a better estimate of the degradations and more specifically the attenuation due to gases and clouds. Even if the specific attenuation is small, except in the frequency band where resonance is present (such as 60 GHz for oxygen), it is always present. The meteorological data available worldwide are now currently used for the estimation of the attenuation due to oxygen, water vapour and clouds [1] [2]. Satellite propagation campaigns are ongoing for the accurate determination of attenuation models in Ka and Q band, using for example the Alphasat satellite from the European Space Agency [3], at 19.7 GHz and 39.4 GHz. The beacon receivers measure directly the power of the beacon received from the satellite but they suffer from various types of instabilities due to tracking inaccuracies, temperature effects, etc and cannot measure the total attenuation of the beacon, in the absence of an external reference (excess attenuation measurement). A concurrent radiometer measures the brightness temperature, enables the accurate estimation of the total attenuation along the path in the absence of scattering, and produce the Integrated Liquid Water (ILW) and Integrated Water Vapour (IWV) content. The cost of the equipment is however high and only a few experimenters use a radiometer [4].","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130716769","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: 3
Tumour Electrotherapy Modelling Using Algebraic Topological Method 基于代数拓扑方法的肿瘤电疗建模
2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738735
Aditi Bhatt, Aakash, K. Sankaran
{"title":"Tumour Electrotherapy Modelling Using Algebraic Topological Method","authors":"Aditi Bhatt, Aakash, K. Sankaran","doi":"10.23919/URSIAP-RASC.2019.8738735","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738735","url":null,"abstract":"Electromagnetic therapy is extensively used in various medical treatments of tumour cells. Different studies reveal that electrotherapy can effectively destroy or shrink tumour cells. Accurate modelling of the electromagnetic interactions with the tumour cells will enable biomedical engineers to develop effective treatment techniques. In this paper, we present a radically different non-mainstream approach based on algebraic topology to model this type of problems. We discuss the basic modelling framework for simulating electric field interactions with tumour cells and suggest a test problem to study such interactions at different skin-depths.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130752582","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
Application of Classification Techniques for Identification of Water Region in Multiple Sources using Landsat-8 OLI Imagery 分类技术在Landsat-8 OLI多源水体区域识别中的应用
2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738343
V. Mishra, T. Pant
{"title":"Application of Classification Techniques for Identification of Water Region in Multiple Sources using Landsat-8 OLI Imagery","authors":"V. Mishra, T. Pant","doi":"10.23919/URSIAP-RASC.2019.8738343","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738343","url":null,"abstract":"Landsat-8 OLI (Operational Land Imagery) data is used to identify the water of the Ganges and the Yamuna in the Sangam region of Allahabad of Uttar Pradesh, India. Landsat-8 has eleven different bands and each band has its own significance in terms of remotely sensed information. The study exhibits the suitable band from these available eleven bands to classify the water of two rivers in the same class more accurately, either we use supervised or unsupervised classification schemes. The study will help to choose that band which will identify the water in such regions where different sources of water used to meet.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132872720","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
Incorporation Algorithm with RPM and DBIM in Bayesian Framework for Microwave Non-destructive Testing 贝叶斯框架下微波无损检测的RPM和DBIM结合算法
2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738236
Shuto Takahashi, S. Kidera
{"title":"Incorporation Algorithm with RPM and DBIM in Bayesian Framework for Microwave Non-destructive Testing","authors":"Shuto Takahashi, S. Kidera","doi":"10.23919/URSIAP-RASC.2019.8738236","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738236","url":null,"abstract":"Microwave non-destructive testing (NDT) is promising for non-contact and speedy survey for air cavity or metallic rust buried into concrete media in tunnel or highway. As an imaging algorithm for the above application, the distorted born iterative method (DBIM) is one of the promising options to retrieve not only target’s location but its dielectric property, which is useful for material characterization. However, in an actual NDT scenario, scattered data from limited direction are available, which makes the problem more ill-posed. In this paper, the incorporation algorithm with radar approach as the range points migration (RPM) method, which offers a prior estimate of the region of interest (ROI), substantially reduces the number of unknowns in the DBIM. Furthermore, the variational Bayesian expectation maximization (VBEM) algorithm is introduced in the above incorporation. The finite-difference time-domain (FDTD) based numerical simulations demonstrate that the proposed method achieves faster convergence and more accurate results compared with that without the prior ROI estimation.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133529029","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: 3
Low frequency radio observations of the ‘background’ corona during the declining phase of solar cycle 24 在第24太阳活动周期衰退期对“背景”日冕的低频无线电观测
2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738381
M. Vrunda, R. Ramesh, Chinnadurai Kathiravan, M. Rajesh
{"title":"Low frequency radio observations of the ‘background’ corona during the declining phase of solar cycle 24","authors":"M. Vrunda, R. Ramesh, Chinnadurai Kathiravan, M. Rajesh","doi":"10.23919/URSIAP-RASC.2019.8738381","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738381","url":null,"abstract":"We studied the characteristics of the solar corona during the declining phase of solar cycle 24 using data obtained with the Gauribidanur RAdioheliograPH (GRAPH) near Bangalore in India. The observing frequencies were 80 MHz and 53 MHz. Radio emission corresponding to the above frequencies originate typically at heliocentric distances $sim 1.5 mathrm {R}_{bigodot }$and $sim 1.7 mathrm {R}_{bigodot }($where $mathrm {R}_{bigodot }$is the radius of the solar photosphere), respectively. Observations of only the ‘undisturbed’ corona, i.e. when there were no transient radio emissions and X-ray$/ mathrm {H}alpha $flares, were used for the present study. The period of observations was January 2015 to August 2018. The results obtained will be reported.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133551940","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
Estimation of EMF for base stations using signal decoding technique 基于信号解码技术的基站电磁场估计
2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738326
Sangbong Jeon, A. Lee, Jungsun Um, Hyung-Do Choi
{"title":"Estimation of EMF for base stations using signal decoding technique","authors":"Sangbong Jeon, A. Lee, Jungsun Um, Hyung-Do Choi","doi":"10.23919/URSIAP-RASC.2019.8738326","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738326","url":null,"abstract":"In this paper, EMF radiated from base stations was evaluated using signal decoding technique for LTE FDD communication system. We also applied the decoding technique to the fifth generation (5 G) new radio (NR) structure to estimate EMF radiation. The signal decoding technique is a logical method, which the radiated field is estimated based on constant signals transmitted by a base station such as reference signal (4G) and synchronization signal block burst (5G). However, the measured results showed that the received field strength is significantly influenced by fading in the real environment.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133579584","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 of Wideband Wearable Antenna using Characteristic Mode Analysis 基于特征模态分析的宽带可穿戴天线设计
2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738617
S. Yan, G. Vandenbosch
{"title":"Design of Wideband Wearable Antenna using Characteristic Mode Analysis","authors":"S. Yan, G. Vandenbosch","doi":"10.23919/URSIAP-RASC.2019.8738617","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738617","url":null,"abstract":"A wideband wearable antenna for Wireless Body Area Network (WBAN) applications is designed based on characteristic mode analysis (CMA). By using the ground as a part of the radiator, the impedance bandwidth of the antenna is greatly increased. The other performances of the antenna, e.g., the realized gain, radiation efficiency, radiation pattern, and the specific absorption rate (SAR) are analyzed both in free space and on the human body. This wide band behavior provides robustness across different environments and to relatively large fabrication tolerances.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133412919","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: 3
S11 Calibration Method for a Coaxial Line with Three Reference Materials and no Short Termination Condition for Dielectric Measurement in Liquids S11液体介质测量中三种参考物质无短端接条件同轴线的校准方法
2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738728
K. Shibata
{"title":"S11 Calibration Method for a Coaxial Line with Three Reference Materials and no Short Termination Condition for Dielectric Measurement in Liquids","authors":"K. Shibata","doi":"10.23919/URSIAP-RASC.2019.8738728","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738728","url":null,"abstract":"This paper proposes an S11 calibration method for a coaxial-feed-type open-ended cut-off waveguide with a vector network analyzer (VNA) from three reference materials with no short termination condition. The equation for S11 calibration from three arbitrary impedance standards was first derived, and the electrostatic capacitance unique to the jig was then quantified. The theoretical values for input impedance at the front surface of the sample material were then determined by substituting the capacitance value into the equivalent circuit at frequencies of 0.50, 0.75 and 1.0 GHz. The calibrated S11 value for the front surface of the sample material was then determined. The validity and measurement accuracy of the proposed method were verified via comparison of this S11 calibration value with that calculated using EM analysis. The results numerically indicated the validity of S11 calibration for the coaxial-feed type open-ended cut-off waveguide using VNA from the three reference materials with no short termination condition based on the proposed procedure. The effectiveness of the method was also verified from actual measurement of S11 in the frequency range from 0.5 to 3.0 GHz, thereby confirming its effectiveness.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133183817","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: 3
Fusing Measured and Simulated Data for Radio Map Construction in Localization Applications 融合测量数据和模拟数据用于定位应用中的无线电地图构建
2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738198
Azril Haniz, G. Tran, K. Sakaguchi, J. Takada, Toshihiro Yamaguchi, T. Mitsui, S. Arata
{"title":"Fusing Measured and Simulated Data for Radio Map Construction in Localization Applications","authors":"Azril Haniz, G. Tran, K. Sakaguchi, J. Takada, Toshihiro Yamaguchi, T. Mitsui, S. Arata","doi":"10.23919/URSIAP-RASC.2019.8738198","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738198","url":null,"abstract":"Most localization algorithms can be classified into the geometrical approach, where the location of the target is determined geometrically using the estimated range of the target or the angle of arrival (AOA) of the target’s signal at receiver sensors. Range and AOA estimation require the line-of-sight (LOS) between the target and sensors, which is unlikely in a dense urban scenario where the antenna heights are much lower than the building heights. It is expected that fingerprinting approaches, which do not require LOS, achieve higher localization accuracy than geometrical ones.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133227096","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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