2022 URSI Regional Conference on Radio Science (USRI-RCRS)最新文献_第9页

Design and Analysis of FSS based Quad-band Absorber using Multi-frequency Resonators 基于FSS的多频谐振器四波段吸收器的设计与分析

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118545

Archana Kumari, R. Chaudhary

引用次数: 0

Human Activity Recognition using Deep Learning 使用深度学习的人类活动识别

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118525

Ramu Moola, Ashraf Hossain

{"title":"Human Activity Recognition using Deep Learning","authors":"Ramu Moola, Ashraf Hossain","doi":"10.23919/URSI-RCRS56822.2022.10118525","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118525","url":null,"abstract":"Machine learning research is heavily focused on human activity detection since it has various applications in a variety of fields, including security, entertainment, ambient supported living, and health management and monitoring. Researchers' interest in human daily activities is seen from studies on human activity recognition (HAR). As a result, the general architecture of the HAR system and a description of its key elements are described in this work. Review of the state-of-the-art in accelerometer-based human activity recognition According to this survey, the majority of recent research that employed CNN for HAR identification relied on it even though other deep learning models also showed acceptable accuracy. The paper suggests a 2 different classification depending on the kind of machine learning (conventional or deep learning) and the manner of execution (online or offline). Comparing 48 studies prediction performance, algorithms, activity categories, and used equipment. The study concludes by contrasting the difficulties and problems associated with identifying human movement based on accelerometer sensors utilizing deep learning versus conventional machine learning, as well as online versus offline.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123528495","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

Remote Sensing of Vertical Wind for the characterization of Atmospheric Convection 大气对流特征的垂直风遥感研究

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118514

Meenu R. Nair, M. Kalapureddy, Sukhanya Patra

{"title":"Remote Sensing of Vertical Wind for the characterization of Atmospheric Convection","authors":"Meenu R. Nair, M. Kalapureddy, Sukhanya Patra","doi":"10.23919/URSI-RCRS56822.2022.10118514","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118514","url":null,"abstract":"Vertical wind $(w)$ profile is an important parameter that affects various meteorological processes throughout all scales, ranging from micro to synoptic and planetary scales. Vertical wind affects the growth and development of most of the weather event viz., cyclone, mesoscale convective systems, thunderstorms, deep convective clouds, and cloud electrification. Advanced clear-air Wind profiler technology is the only tool that enables the direct w measurement in all weather conditions at high time-height resolution throughout the troposphere and lower stratosphere. Due to dynamic and thermodynamic factors, the turbulent eddies create refractive index variations which is the primary source of scattering for these clear-air radars. The wind profiler is an efficient means to study convection whose intensity can be determined by vertical wind measurements. The convective activity over India changes according to local and large scale features, showing a clear annual cycle. The Indian Summer Monsoon (ISM) is a large scale phenomenon bringing forth significant convection and cloud across the Indian latitudes. The annual cycle of vertical structure of basic atmospheric conditions created for versatile convective regimes provides the evolution of atmosphere features. This study analyzes and builds a hypothesis of the existing vertical velocity field and its variability from the available wind profiler observations over different convective regimes in the Indian region. An attempt will be made to understand the factors determining the vertical wind characteristics during different convective scenarios like shallow, moderate and deep convection.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128316000","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

Electron Acoustic Cnoidal Waves in an Electron Beam Plasma 电子束等离子体中的电子声余弦波

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118479

R. Kaur, G. Slathia, S. Singla, M. Kaur, N. S. Saini

引用次数: 0

Investigation of Circular Dichroism in Asymmetric Metamaterial 非对称超材料的圆二色性研究

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118544

Priyanka Das, G. Varshney

引用次数: 0

Direction Finding by Time Modulated Circular Array using MUSIC Algorithm 基于MUSIC算法的时调制圆阵测向

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118579

Magnel Rose Mathew, A. P, D. D. Krishna, P. M. Krishna

引用次数: 0

Comparative Analysis of FPGA based Systems and Indigenously developed Analog System for Frequency Stabilization of Lasers in NPLI-CsF1 NPLI-CsF1中基于FPGA的激光器稳频系统与自主开发的模拟系统的比较分析

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118489

Navraj Poudel, S. Yadav, M. Das, Aniket Gupta, Amitava Sen Gupta, P. Arora

{"title":"Comparative Analysis of FPGA based Systems and Indigenously developed Analog System for Frequency Stabilization of Lasers in NPLI-CsF1","authors":"Navraj Poudel, S. Yadav, M. Das, Aniket Gupta, Amitava Sen Gupta, P. Arora","doi":"10.23919/URSI-RCRS56822.2022.10118489","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118489","url":null,"abstract":"Lasers and their stabilization to a particular hyper-fine transition of Cs-133 atoms is the back bone of the primary frequency standard (Cs fountain clocks). In CSIR-NPL we have indigenously developed primary frequency standard known as NPLI-CsF1 [1]. For the laser cooling of Cs atoms, ultra-stable laser frequency is required. A compact all-in-one laser frequency stabilization system has been designed which serves multiple objectives as it generates a square wave for modulating the laser current, provides lock-in amplification, enables us to monitor the derivative curve, to control the gain of system, and to produce and monitor the servo-control signal for providing feedback. This cost-effective and customizable analog locking system provide top-of-fringe locking with a phase-sensitive error signal corresponding to the Saturation Absorption Spectroscopy peaks of Cesium (Cs)-133 D2 line, which is fed back to the piezo of the laser for its frequency stabilization. The system provides stable frequency locking of laser for days at a stretch. Characterization and comparison of the circuit with FPGA based lock-in device has also been performed.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126376129","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

Microstrip-based Patch Array with rectenna architecture for radio frequency energy harvesting at 2.45 GHz ISM band 基于微带贴片阵列的整流天线结构，用于2.45 GHz ISM频段的射频能量采集

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118487

Harsh Anand Singh, Manas Aggarwal, A. Karmakar, Keka Biswas, Bobby, B. Biswas

引用次数: 0

Investigation of a Broadband Circularly Polarized Printed Monopole Antenna for RF Energy Harvesting Application 用于射频能量采集的宽带圆极化印刷单极天线研究

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118522

B. R. Behera, S. Mishra

引用次数: 0

Experimental Studies on the Impact of Chassis Voltage on a GNSS Receiver Embedded Navigation Computer, Results and Design Improvements 底盘电压对GNSS接收机嵌入式导航计算机影响的实验研究、结果与设计改进

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118444

Biju Vs, Vinoj Vs, Anand Shankar O T, Mohammed Basim A, Radhakrishna Pillai C, S. S

{"title":"Experimental Studies on the Impact of Chassis Voltage on a GNSS Receiver Embedded Navigation Computer, Results and Design Improvements","authors":"Biju Vs, Vinoj Vs, Anand Shankar O T, Mohammed Basim A, Radhakrishna Pillai C, S. S","doi":"10.23919/URSI-RCRS56822.2022.10118444","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118444","url":null,"abstract":"Global Navigation Satellite System (GNSS) receivers are a suitable candidate for aiding the performance of a low cost IMU for launch vehicle which injects satellites to Low Earth Orbit (LEO). The GNSS receiver can be embedded into the navigation processor itself for reducing size, weight and cost. The navigation computer in a launch vehicle, being a mission critical element is generally designed with special care w.r.t its grounding scheme, isolation techniques and quality standards. The incorporation of a GNSS receiver into the navigation computer calls for major design changes. Being an RF circuit, the signal ground of a GNSS receiver should be connected to chassis of the launch vehicle. This contradicts the normal notion of ground isolation with chassis followed in navigation computers. A GNSS embed Navigation Processor (GNP) board which houses a Navigation processor and a NavIC/GPS receiver is developed for launch vehicle applications. In view of the change in grounding philosophy, the GNP board is subjected different tests to simulate the chassis potential rise scenarios commonly seen in a launch vehicle. Different conditions like inadvertent chassis voltage during stage separation, instruments converter shorting to chassis, pyro or valve battery live shorting to chassis and pyro or valve battery live shorting to return are simulated. The tests results are critically analyzed and some design improvements are implemented to make GNP more robust to chassis voltages.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131143253","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