2022 URSI Regional Conference on Radio Science (USRI-RCRS)最新文献_第3页

An Improved NRW procedure for Dielectric Characterization for solids and Uncertainty Estimation 固体介质表征的改进NRW方法及不确定度估算

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118494

A. Sharma, S. Dubey

{"title":"An Improved NRW procedure for Dielectric Characterization for solids and Uncertainty Estimation","authors":"A. Sharma, S. Dubey","doi":"10.23919/URSI-RCRS56822.2022.10118494","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118494","url":null,"abstract":"We present a modified approach for extraction of dielectric properties of low-loss dielectric materials using two port T/R measurement. The procedure utilizes NRW method, but without the need for shifting the reference planes. This is done by employing full two-port (TOSM) calibration at the waveguide ports and specially designed sample holders along with precisely machined MUT samples. This approach enables repeatable and precise placement of MUTs in sample holder, during repetitive measurements and reduces the errors due to improper placing of MUT in the sample holder/guide. This also makes the uncertainty evaluation less complex compared to the traditional NRW approach. Sample holders of different lengths have been fabricated for WR90 waveguide (X-band; 8.2 GHz to 12.4 GHz). Experimental measurements are carried out for multiple samples of two of most commonly used low-loss dielectric materials in RF & microwave domain i.e. Poly-Tetra-Fluro-Ethylene (PTFE or Teflon) and Poly-Propylene (PP). Different lengths of same materials are used and the results are compared with traditional NRW method as well. Combined uncertainty budgets for the proposed procedure have been presented, using the experimentally obtained sensitivity coefficients for the modified dielectric property extraction procedure along with other system uncertainty contributors.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"39 S180","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113954193","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

A Study on Passive and Active Detection of Missiles 导弹被动与主动探测技术研究

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118548

Vangipurapu Lakshmi Harshitha, K. Narayan, J. Baskaradas

引用次数: 0

Analysis of realistic HI 21-cm maps from Epoch of Reionization using Largest Cluster Statistics (LCS) 利用最大聚类统计(LCS)分析再电离时代真实HI 21厘米地图

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118469

S. Dasgupta, S. Bag, S. Majumdar, S. Dutta

{"title":"Analysis of realistic HI 21-cm maps from Epoch of Reionization using Largest Cluster Statistics (LCS)","authors":"S. Dasgupta, S. Bag, S. Majumdar, S. Dutta","doi":"10.23919/URSI-RCRS56822.2022.10118469","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118469","url":null,"abstract":"Using the topological and morphological evolution of neutral hydrogen distribution during the different stages of the Epoch of Reionization (EoR), we try to reveal the nature of the ionizing sources and the astrophysical processes in the Intergalactic Medium (IGM) during this period by studying the evolution of the largest ionized region (via the Largest Cluster Statistics - LCS). We show that It can identify the difference between two distinct reionization scenarios - inside-out and outside-in, even when realistic observational conditions are taken into account i.e. the simulated HI 21cm maps are initially translated to a lower resolution, then corrupted with a simulated Gaussian noise having an RMS value of $sim 3mK$ in line with the future SKA1-low observations. Afterwards, the effect of the beam was simulated and incorporated into the maps, and then the images are analyzed via LCS. Additionally, we use Shapefinders (SFs) to investigate the morphology of ionized volumes as they change in different reionization models. We observed that the greatest ionized volume abruptly expands solely in terms of its third SF after percolation while the first two SFs stay almost constant. Ergo, when approaching percolation, the ionized hydrogen in these circumstances becomes very filamentary, with a characteristic cross-section’ that differs between source models.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"53 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113978579","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

Pulsed Interference Mitigation for a NavIC Reference Receiver 导航参考接收机的脉冲干扰抑制

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118478

Aakanksha Avnish Bhardwajan, Prem Ranian Dubey, Sharda Vashisth, T. Ganesh, A. Gupta, M. R. Raghavendra

{"title":"Pulsed Interference Mitigation for a NavIC Reference Receiver","authors":"Aakanksha Avnish Bhardwajan, Prem Ranian Dubey, Sharda Vashisth, T. Ganesh, A. Gupta, M. R. Raghavendra","doi":"10.23919/URSI-RCRS56822.2022.10118478","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118478","url":null,"abstract":"Navigation with Indian Constellation (NavIC), also known as Indian Regional Navigation Satellite System (IRNSS), is the Indian regional satellite navigation system. NavIC relies on a vast network of one-way ranging reference stations for its precise orbit determination and time synchronisation (OD&TS) functions. These reference stations are equipped with reference receivers which act as measurement engines and provide the raw code and carrier phase measurements to the OD&TS process. NavIC provides navigation services in two Radio Frequency (RF) bands, namely L5 and S. L5 band, centred at 1176.45 MHz is susceptible to pulsed interference from Distance Measuring Equipment used for civil aviation. ISTRAC is currently undertaking the development of an indigenous tri band reference receiver for the one way ranging stations of the NavIC ground segment. An asynchronous Pulse Blanker has been implemented for the in-house NavIC Tri-band Reference receiver for the detection and mitigation of the pulsed interference in L5. Furthermore, implementation of digital pulse blanking has been designed to be independent of the RF band and thus can provide benefits to NavIC receivers operating at frequencies other than L5, i.e. S with its known dense interference environment.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"41 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":"122689458","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

Detection of Hypersonic Missiles in presence of Plasma Stealth 等离子体隐身条件下高超音速导弹的探测

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118527

Vangipurapu Lakshmi Harshitha, J. Baskaradas

引用次数: 0

Design of an Efficient GeSn Based Grating Coupler to excite Plasmon Waves in $mathbf{3}-mathbf{20} boldsymbol{mu}mathbf{m}$ MIR Range in GeSn/SiGeSn Structure on Si Platform Si平台上GeSn/SiGeSn结构$mathbf{3}-mathbf{20} boldsymbol{mu}mathbf{m}$ MIR范围内激发等离子体波的高效GeSn光栅耦合器设计

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118442

Bratati Mukhopadhya, P. K. Basu

引用次数: 0

Investigation of LTCC-based patch antenna for Wireless Applications 无线应用中基于ltcc的贴片天线研究

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118495

Aditi, N. Suri, Omprakash Ranjan, D. Kharbanda, S. Das, Ayan Bandopadhyay, P. K. Khanna

引用次数: 0

Martian Upper Tropospheric Twilight Clouds: First-time observation from India's First Mars Orbiter Mission (MOM) 火星对流层上层的暮光云:印度首次火星轨道飞行器(MOM)的首次观测

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118504

J. Kalita, A. Guha, M. Mishra

{"title":"Martian Upper Tropospheric Twilight Clouds: First-time observation from India's First Mars Orbiter Mission (MOM)","authors":"J. Kalita, A. Guha, M. Mishra","doi":"10.23919/URSI-RCRS56822.2022.10118504","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118504","url":null,"abstract":"MOM completed nearly 8 years in the Mars Orbit (2014–2022). During this period Mars Colour Camera (MCC) captured images of different types of clouds formed in the Martian Atmosphere. In present work, we mainly concentrate on the clouds appearing in the morning and evening terminator or in short seen at twilight. We considered 15 cases of clouds observed at twilight, in which the geometry of the observations allows us to derive the minimum altitude of the clouds, revealing that many of these clouds are in the upper troposphere (above 25 km and up to 45 km). The majority of these upper tropospheric clouds were detected in mid-latitudes (30N - 60N) during the Martian autumn and early winter season (Ls 20 to 90 deg). In this mid-latitude region, we also reported a detached layer of dust and water ice cloud in our previous work (Kalita et al., 2021a; 2021b). We propose a plausible mechanism that enhances the probability of the formation of a high-altitude cloud through temperature variation. Our selection process is manual and based on the contrast enhancement through GIMP. Image geometry confirms the incidence angle in the range of 95 to 105 degrees for evening clouds and 75 to 85 degrees during morning and further, using the angle values we estimated the height of the twilight clouds. Further verification with MCS data concretizes our finding regarding upper tropospheric cloud formation.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"1 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":"133049849","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

Antenna Array Ambiguity Function Based Study of Integration Effect on a 2D Automotive MIMO RADAR Antenna Placed Behind a Painted Bumper 基于天线阵列模糊函数的涂漆保险杠后二维汽车MIMO雷达天线集成效果研究

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118565

J. C. Dash, D. Sarkar

引用次数: 2

Triggering of convective precipitation observed with 206.5 MHz VHF radar over the central Himalayas 206.5 MHz甚高频雷达对喜马拉雅山中部对流降水触发的观测

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/ursi-rcrs56822.2022.10118441

S. Bhattacharjee, M. Naja, A. Jaiswal, K. Rawat, S. Ananthakrishnan

引用次数: 0