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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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Wide-Band Linear Polarizer Based on a Frequency Selective Surface 基于频率选择表面的宽带线性偏振器
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560451
A. De Sabata, L. Matekovits, A. Silaghi, A. Buta
{"title":"Wide-Band Linear Polarizer Based on a Frequency Selective Surface","authors":"A. De Sabata, L. Matekovits, A. Silaghi, A. Buta","doi":"10.23919/URSIGASS51995.2021.9560451","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560451","url":null,"abstract":"A Frequency Selective Surface built on an FR4 substrate, that exhibits linear polarized transmission field for a generally polarized incident electromagnetic waves in the frequency range below 10 GHz is introduced. Outgoing waves are linearly polarized on two orthogonal directions, in two different frequency bands. The operation of the proposed structure is wide-band, the two bands intersecting at −10 dB. A parametric study demonstrates flexibility in design, also the structure being tested for oblique incidence","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"12 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":"125216653","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
A Fully Coherent Array for Evaporation Duct Height Estimation at Coastal Boundaries 沿海边界蒸发管道高度估计的全相干阵列
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560320
Joe Vinci, C. Yardim, J. Johnson, M. Andrews
{"title":"A Fully Coherent Array for Evaporation Duct Height Estimation at Coastal Boundaries","authors":"Joe Vinci, C. Yardim, J. Johnson, M. Andrews","doi":"10.23919/URSIGASS51995.2021.9560320","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560320","url":null,"abstract":"The Coherent Vertical Array (CoVA) system has been designed to be used during the Coastal Land-Air-Sea Interactions (CLASI) mission for evaporation duct height (EDH) estimation by measuring the grazing angle of the incident, ducted signal. High angular resolution and phase coherence is needed in the CoVA system due to the ducted signal having a narrow grazing angle with small variations translating to large variations in EDH estimation. This paper discusses the design of the CoVA system and the methodology used to achieve high phase coherence. The results obtained by CoVA during CLASI will be presented in future work.","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":"117112254","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
Radio Waveforms Classification via Deep Q Learning Network 基于深度Q学习网络的无线电波分类
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560242
Siqi Lai, Mingliang Tao, Xiang Zhang, Ling Wang
{"title":"Radio Waveforms Classification via Deep Q Learning Network","authors":"Siqi Lai, Mingliang Tao, Xiang Zhang, Ling Wang","doi":"10.23919/URSIGASS51995.2021.9560242","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560242","url":null,"abstract":"Radio waveforms classification plays a foundation role in cognitive radio, which promises a broad prospect in spectrum monitoring and management. In this paper, a radio waveforms classification via deep Q learning is proposed, in which a deep reinforcement learning agent is trained to classify signal modulation type. Differ from the widely applied deep learning strategy, the proposed method has strong self-learning decision-making ability, which can find the optimal strategy by trial and error. The simulation results show that it can realize classification of radio signal modulation type with high accuracy.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"16 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":"117146586","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
An Overview On the Optimization of Beam-Steering Metasurfaces 波束导向元表面优化研究综述
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560584
Khushboo Singh, M. Afzal, K. Esselle
{"title":"An Overview On the Optimization of Beam-Steering Metasurfaces","authors":"Khushboo Singh, M. Afzal, K. Esselle","doi":"10.23919/URSIGASS51995.2021.9560584","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560584","url":null,"abstract":"This paper presents an evaluative summary of the optimization algorithms based methods reported to improve the efficiency of Near-Field Meta-Steering (NFMS) systems. These methods are classified into two categories based on their objective functions. The first category includes methods, which defined their objective function in terms of directivity pattern and desired radiation pattern mask, to either optimize long 1D arrays of phase-shifting cells in the metasurfaces or optimize the amplitude distribution of the feeding base antenna. The second category includes those methods, which used Floquet modes to only optimize the periodically repeating group of cells in the metasurfaces. Each of these is discussed briefly, followed by a detailed discussion on their advantage and relevance. The periodic nature of PGMs is used to create a computationally inexpensive equivalent model, which is then used for optimization purposes. Both methods substantially improve the performance of PGM-based beam-steering systems.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"55 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":"121099664","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
Software Defined Radio Based Drone Receiver Payload 基于软件定义无线电的无人机接收机有效载荷
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560630
Elizabeth A. Shi, M. Andrews, C. Yardim, J. Johnson, Joe Vinci
{"title":"Software Defined Radio Based Drone Receiver Payload","authors":"Elizabeth A. Shi, M. Andrews, C. Yardim, J. Johnson, Joe Vinci","doi":"10.23919/URSIGASS51995.2021.9560630","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560630","url":null,"abstract":"A drone receiver (RX) payload is built as a combination of an embedded software defined radio (SDR) and a low noise amplifier (LNA) and limiter circuit to sample radio frequencies (RF) that are transmitted from long distances. The system will be deployed during Costal Land-Air-Sea Interactions (CLASI) experiment in June in Monterey CA to measure EM propagation under ducting conditions [2]. This compact and lightweight system can be attached to a drone for collecting and recording data at high altitudes while maintaining the drone's mobility. This system is cost-effective and simple to operate. Since the SDR is embedded, the software can be uploaded into the SDR after which it can operate independently with no computer control. Limiter LNA both improves the overall noise figure of the receiver payload to ~ 3–4 dB while also acting as a limiter to protect the SDR.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"18 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":"127075860","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
Geomagnetic Activity and Lower Atmosphere Processes 地磁活动与低层大气过程
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560260
P. Sedykh
{"title":"Geomagnetic Activity and Lower Atmosphere Processes","authors":"P. Sedykh","doi":"10.23919/URSIGASS51995.2021.9560260","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560260","url":null,"abstract":"During substorms and storms, the ionosphere was subjected to rather a significant Joule heating, and the power of precipitating energetic particles was also great. If there is a mechanism for the magnetospheric disturbance effect on meteorological processes in the atmosphere, it supposes a more complicated series of many intermediates, and is not associated directly with the energy flux that arrives into the ionosphere during storms. In this study, I have briefly reviewed our present understanding of how these events play a key role in energy transfer from the solar wind into the magnetosphere and ionosphere, which ultimately results in the Earth's ionosphere-atmosphere coupling.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"16 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":"127195843","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
Generalised Self-Holography 普遍Self-Holography
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560415
S. Wijnholds
{"title":"Generalised Self-Holography","authors":"S. Wijnholds","doi":"10.23919/URSIGASS51995.2021.9560415","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560415","url":null,"abstract":"The recently proposed self-holography method has the potential to reduce the computational resources needed for calibration of individual receive paths in large arrays like LOFAR and SKA significantly. The method relies on forming different beams from which the receive path gains can be reconstructed. Self-holography has been applied successfully with different beamforming schemes. In this contribution, I present a generalised formulation of self-holography capturing any beamforming scheme and use that to assess its robustness to interfering sources. This analysis indicates that the relative gain bias is inversely proportional to the signal-to-interference ratio (SIR) regardless of the beamforming scheme used. This result is corroborated in simulations. However, the chosen beamforming scheme has significant impact on the condition number of the measurement matrix and, hence, on the susceptibility to measurement noise. A beamforming scheme with (nearly) orthogonal beamformer weight vectors is thus to be preferred.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"97 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":"124730187","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
Lessons Learnt from HY-2B RFI Activities and Preliminary Studies on RFI Detection and Localization for the Chinese Ocean Salinity Satellite HY-2B RFI活动的经验教训及中国海洋盐度卫星RFI探测与定位的初步研究
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560357
Yinan Li, H. Ren, Congcong Wang, Wu Zhou, W. Gao
{"title":"Lessons Learnt from HY-2B RFI Activities and Preliminary Studies on RFI Detection and Localization for the Chinese Ocean Salinity Satellite","authors":"Yinan Li, H. Ren, Congcong Wang, Wu Zhou, W. Gao","doi":"10.23919/URSIGASS51995.2021.9560357","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560357","url":null,"abstract":"Distributed from L to high frequency band, Radio frequency interferences (RFIs) are contaminating the geophysical parameters estimated from the measurements of microwave radiometers. Chinese researchers are developing series of Earth observation satellites focusing on the marine dynamic environment for numerical weather prediction and climate monitoring. The scanning microwave radiometer onboard HY-2B (Haiyang-2B) has been monitoring sea surface temperature observations since 2018. After more than 2 years in orbit, an overview of RFI scenario worldwide has been provided and lessons have been learnt from HY-2B RFI activities. The Interferometric Microwave Radiometer (IMR) will be a main payload onboard the Chinese Ocean Salinity Satellite. Preliminary studies have been carried out on RFI detection and localization to improve the performance of this mission.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"25 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":"125834209","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
Active/Passive Remote Sensing of a Mature Soybean Canopy at L-band 成熟大豆冠层l波段主/被动遥感研究
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560299
Yiwen Zhou, R. Lang, Avinash Sharma, P. O’neill
{"title":"Active/Passive Remote Sensing of a Mature Soybean Canopy at L-band","authors":"Yiwen Zhou, R. Lang, Avinash Sharma, P. O’neill","doi":"10.23919/URSIGASS51995.2021.9560299","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560299","url":null,"abstract":"This paper reports on development of a scattering model of a soybean canopies at L-band. The scattering model will be used for active and passive remote sensing of soybean plants with an emphasis on mature soybeans where the presence of pods is important to the observed microwave signal. The active problem is treated using the Distorted Born Approximation (DBA) and the passive problem is analyzed using Peake's method. These results are compared with field measurements made in 2012 by the truck-mounted ComRAD system, which is a combined radar and radiometer instrument operating at L-band. Investigation of backscatter from the soybean canopy shows good agreement between the radar measurement data and modeling results. The results also indicate that the L-band radar backscatter can be used to monitor both the soil moisture and the growth of the soybean pods. Past passive modeling efforts have not considered soybeans late in the growing season when pods are important. A new passive radiation model of soybean canopy will be developed based on the backscatter model.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"154 4 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":"126127329","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
Open-Source Software-Defined Radio Receiver Platform for Harmonic Radar Applications to Track Airborne Insects 用于谐波雷达跟踪机载昆虫的开源软件定义无线电接收机平台
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Pub Date : 2021-08-28 DOI: 10.23919/URSIGASS51995.2021.9560407
Diego Peñaloza-Aponte, J. Urbina, J. Fuentes
{"title":"Open-Source Software-Defined Radio Receiver Platform for Harmonic Radar Applications to Track Airborne Insects","authors":"Diego Peñaloza-Aponte, J. Urbina, J. Fuentes","doi":"10.23919/URSIGASS51995.2021.9560407","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560407","url":null,"abstract":"We report on the development and integration of a cost-effective, open-source software-defined radio (SDR) receiver into a harmonic radar system to study the movement patterns of insect pollinators. A Raspberry Pi along with the SDR collects data to process it and subsequently transfers it wirelessly via an ad-hoc WiFi network to a host computer. This remote access receiver was programmed fully using Python. We describe the SDR system along with preliminary testing of the radar receiver in a laboratory setting.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"36 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":"126613120","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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