Pub Date : 2019-07-01DOI: 10.1109/USNC-URSI.2019.8861755
Francesco Filice, N. Nachabe, C. Luxey, F. Gianesello
On-going research about Low Earth Orbit (LEO) mobile satellite communications (Sat-Com-on-The-Move) push towards the designs of low-cost and low-profile user terminals. This paper proposes initial results about a wideband double-ridged waveguide antenna to be further integrated in a mobile-user terminal array-antenna, operating in Ku-Band (10.75 – 14.5 GHz). The design of a 2×2 sub-array covering the Ku-band with an efficiency above 70% is proposed to be later used as a unit cell in a larger array. Fabrication with 3D-printing technology is envisaged in order to assess the performance of this design.
近地轨道(LEO)移动卫星通信(sat - com -on- move)技术的不断发展推动了低成本、低姿态用户终端的设计。本文提出了一种宽带双脊波导天线的初步结果，该天线将进一步集成到移动用户终端阵列天线中，工作在ku波段(10.75 - 14.5 GHz)。提出了一种覆盖ku波段的2×2子阵列的设计，其效率在70%以上，以后可以用作更大阵列中的单元电池。设想用3d打印技术制造，以评估该设计的性能。
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Pub Date : 2019-07-01DOI: 10.1109/USNC-URSI.2019.8861696
K. Sharma, R. Mittra
This work presents a novel approach, based on the dipole moment (DM) method, for analyzing electromagnetic scattering from quasi-periodic structures. The main advantage of using the DM method is that it provides convenient closed-form expressions for the scattered fields, facilitating the matrix computation much more efficiently than when the conventional MoM RWGs are used for this computation. Numerical results obtained by using the approach are compared to those derived from a commercial MoM software package, and good agreement is found.
{"title":"A Novel Dipole-Moment-Based Approach for Analyzing Scattering from Quasi-Periodic Structures","authors":"K. Sharma, R. Mittra","doi":"10.1109/USNC-URSI.2019.8861696","DOIUrl":"https://doi.org/10.1109/USNC-URSI.2019.8861696","url":null,"abstract":"This work presents a novel approach, based on the dipole moment (DM) method, for analyzing electromagnetic scattering from quasi-periodic structures. The main advantage of using the DM method is that it provides convenient closed-form expressions for the scattered fields, facilitating the matrix computation much more efficiently than when the conventional MoM RWGs are used for this computation. Numerical results obtained by using the approach are compared to those derived from a commercial MoM software package, and good agreement is found.","PeriodicalId":383603,"journal":{"name":"2019 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124752240","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}
Pub Date : 2019-07-01DOI: 10.1109/USNC-URSI.2019.8861917
Li Xu, Xing Li, Hao Wang, Bingqi Liu, Zhonghai Yang, Bin Li
Recent developments to the discontinuous Galerkin time-domain (DGTD) method for 3-D multiscale problems are reported in this paper. Although the DGTD method is very popular to electromagnetic problems at present, realistic electromagnetic wave propagation problems are often multiscale due to complex geometries or heterogeneous media, which leads to many restrictions of the traditional DGTD methods. Therefore, this paper reports on some significant advances about the DGTD method. First of all, in order to overcome the severe stability restrictions caused by the locally refined meshes, we propose a time integration strategy by combining excellent stability properties with a new explicit time scheme. Second, we apply this strategy into the inhomogeneous media to solve the multiscale dispersive problems. Considering some multiscale meshes with very small size, an unconditional stable hybridizable discontinuous Galerkin time method is proposed to increase time step so that greatly reducing computational time. Particularly, from meshes point of view, a new strategy is proposed by combining the DGTD with Multiscale Hybrid Method (MHM), and the parallel technologies can be greatly performed. By using the above methods, accurate numerical results can be obtained as well as a higher computational performance in the time-domain multiscale problems.
{"title":"Recent Developments to the Discontinuous Galerkin Time-Domain Method for 3-D Multiscale Problems","authors":"Li Xu, Xing Li, Hao Wang, Bingqi Liu, Zhonghai Yang, Bin Li","doi":"10.1109/USNC-URSI.2019.8861917","DOIUrl":"https://doi.org/10.1109/USNC-URSI.2019.8861917","url":null,"abstract":"Recent developments to the discontinuous Galerkin time-domain (DGTD) method for 3-D multiscale problems are reported in this paper. Although the DGTD method is very popular to electromagnetic problems at present, realistic electromagnetic wave propagation problems are often multiscale due to complex geometries or heterogeneous media, which leads to many restrictions of the traditional DGTD methods. Therefore, this paper reports on some significant advances about the DGTD method. First of all, in order to overcome the severe stability restrictions caused by the locally refined meshes, we propose a time integration strategy by combining excellent stability properties with a new explicit time scheme. Second, we apply this strategy into the inhomogeneous media to solve the multiscale dispersive problems. Considering some multiscale meshes with very small size, an unconditional stable hybridizable discontinuous Galerkin time method is proposed to increase time step so that greatly reducing computational time. Particularly, from meshes point of view, a new strategy is proposed by combining the DGTD with Multiscale Hybrid Method (MHM), and the parallel technologies can be greatly performed. By using the above methods, accurate numerical results can be obtained as well as a higher computational performance in the time-domain multiscale problems.","PeriodicalId":383603,"journal":{"name":"2019 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121964669","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}
Pub Date : 2019-07-01DOI: 10.1109/usnc-ursi.2019.8861694
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Pub Date : 2019-03-15DOI: 10.1109/USNC-URSI.2019.8861850
Soumyabrata Dev, Shilpa Manandhar, Y. Lee, Stefan Winkler
Different empirical models have been developed for cloud detection. There is a growing interest in using the ground-based sky/cloud images for this purpose. Several methods exist that perform binary segmentation of clouds. In this paper, we propose to use a deep learning architecture (U-Net) to perform multi-label sky/cloud image segmentation. The proposed approach outperforms recent literature by a large margin.
{"title":"Multi-label Cloud Segmentation Using a Deep Network","authors":"Soumyabrata Dev, Shilpa Manandhar, Y. Lee, Stefan Winkler","doi":"10.1109/USNC-URSI.2019.8861850","DOIUrl":"https://doi.org/10.1109/USNC-URSI.2019.8861850","url":null,"abstract":"Different empirical models have been developed for cloud detection. There is a growing interest in using the ground-based sky/cloud images for this purpose. Several methods exist that perform binary segmentation of clouds. In this paper, we propose to use a deep learning architecture (U-Net) to perform multi-label sky/cloud image segmentation. The proposed approach outperforms recent literature by a large margin.","PeriodicalId":383603,"journal":{"name":"2019 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125399356","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}
Pub Date : 2019-03-15DOI: 10.1109/USNC-URSI.2019.8861808
Shilpa Manandhar, Soumyabrata Dev, Y. Lee, Stefan Winkler
Global Positioning System (GPS) derived precipitable water vapor (PWV) is extensively being used in atmospheric remote sensing for applications like rainfall prediction. Many applications require PWV values with good resolution and without any missing values. In this paper, we implement an exponential smoothing method to accurately predict the missing PWV values. The method shows good performance in terms of capturing the seasonal variability of PWV values. We report a root mean square error of 0.1 mm for a lead time of 15 minutes, using past data of 30 hours measured at 5-minute intervals.
{"title":"Predicting GPS-based PWV Measurements Using Exponential Smoothing","authors":"Shilpa Manandhar, Soumyabrata Dev, Y. Lee, Stefan Winkler","doi":"10.1109/USNC-URSI.2019.8861808","DOIUrl":"https://doi.org/10.1109/USNC-URSI.2019.8861808","url":null,"abstract":"Global Positioning System (GPS) derived precipitable water vapor (PWV) is extensively being used in atmospheric remote sensing for applications like rainfall prediction. Many applications require PWV values with good resolution and without any missing values. In this paper, we implement an exponential smoothing method to accurately predict the missing PWV values. The method shows good performance in terms of capturing the seasonal variability of PWV values. We report a root mean square error of 0.1 mm for a lead time of 15 minutes, using past data of 30 hours measured at 5-minute intervals.","PeriodicalId":383603,"journal":{"name":"2019 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133916009","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}
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