2022 URSI Regional Conference on Radio Science (USRI-RCRS)最新文献_第4页

Wintertime variation of $mathbf{PM}_{mathbf{10}}, mathbf{PM}_{mathbf{2}.mathbf{5}}$, Black Carbon, and Aerosol Optical Depth over Varanasi $mathbf{PM}_{mathbf{10}}， mathbf{PM}_{mathbf{2}的冬季变化。[j]，瓦拉纳西上空的黑碳和气溶胶光学深度

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118511

P. K. Chauhan, Akhilesh Kumar, V. Pratap, S. Prajapati, Ashutosh Kumar Singh

{"title":"Wintertime variation of $mathbf{PM}_{mathbf{10}}, mathbf{PM}_{mathbf{2}.mathbf{5}}$, Black Carbon, and Aerosol Optical Depth over Varanasi","authors":"P. K. Chauhan, Akhilesh Kumar, V. Pratap, S. Prajapati, Ashutosh Kumar Singh","doi":"10.23919/URSI-RCRS56822.2022.10118511","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118511","url":null,"abstract":"Black Carbon (BC) and Particulate Matter $(text{PM}_{10}$ and $text{PM}_{2.5})$ are measured over Varanasi during the winter season. They are the most crucial atmospheric aerosols that play an important role in Earth's radiation budget by absorbing solar and terrestrial radiation. Aerosol Optical Depth (AOD) is the measure of extinction of incoming solar radiation by air particles distributed in a vertical column of the atmosphere. The influence of the atmospheric boundary layer (ABL) is observed on the diurnal variation of BC, PM10, and $text{PM}_{2.5}$. The concentration of these parameters was high during morning and evening hours when ABL is lying near the ground. Maximum and minimum concentrations of PM10 and $text{PM}_{2.5}$ are found to be in November and February. Burning firecrackers during Diwali in November could be the reason for high aerosol loading. Higher BC concentration is measured in January due to increased anthropogenic activities and biomass burning. AOD at 500 nm is found to be higher in December and lower in February. The higher value of AOD at a shorter wavelength suggests the dominance of fine mode particles.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"140 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":"123370942","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

Assessment of Surface Energy Fluxes variation with Land Cover Parameters using LandSat Satellite data 利用LandSat卫星数据评估地表能量通量随土地覆盖参数的变化

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118439

Ruchi Bala, V. Yadav, D. Kumar, R. Prasad

{"title":"Assessment of Surface Energy Fluxes variation with Land Cover Parameters using LandSat Satellite data","authors":"Ruchi Bala, V. Yadav, D. Kumar, R. Prasad","doi":"10.23919/URSI-RCRS56822.2022.10118439","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118439","url":null,"abstract":"The urban heat island (UHI) is formed due to higher local temperatures in urban areas than surrounding rural areas. Impervious surfaces and vegetation are the two major land covers that have the capability to modify energy fluxes. The Latent Heat flux, Sensible Heat Flux and the Ground Heat flux was obtained for Bangalore city and ratio of fluxes to net radiation was calculated. The mean of ratio of each flux to net radiation was calculated for each land cover and found that the urban and bare soil region shows higher values of $mathrm{G}/mathrm{R}_{mathrm{n}}$ as compared to the vegetated land covers. The urban land cover showed higher values of $mathrm{H}/mathrm{R}_{mathrm{n}}$ as compared to the natural land covers and the vegetation and waterbody showed higher values of $text{LE}/mathrm{R}_{mathrm{n}}$ than other land covers. The relation of sensible heat flux with imperviousness and latent heat flux with vegetation was determined. The plot of $mathrm{H}/mathrm{R}_{mathrm{n}}$ with ISF and $text{LE}/mathrm{R}_{mathrm{n}}$ with NDVI, both showed good positive relation.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"39 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":"121713933","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

Drastic Change in the Eclipse Cutoff Frequency for PSR J1544+4937 Observed with the GMRT GMRT观测到的PSR J1544+4937日食截止频率的剧烈变化

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118502

Sangita Kumari, B. Bhattacharyya

引用次数: 0

Analysis of Sectorization Technique in Conventional Dielectric Resonators for Circular Polarization 传统介质谐振器圆极化的扇形技术分析

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118556

R. Chowdhury, R. Chaudhary

引用次数: 0

Seasonal day-night variation of ozone $(mathbf{O}_{mathbf{3}})$ in an eastern urban site, Bhubaneswar and its association with precursors ($mathbf{NO}_{mathbf{x}}$ and NMHC): More sensitivity of $mathbf{O}_{mathbf{3}}$ to NMHC than $mathbf{NO}_{mathbf{x}}$ 布巴内斯瓦尔东部城区臭氧$(mathbf{O}_{mathbf{3}})$的季节变化及其与前体($mathbf{NO}_{mathbf{x}}$和NMHC)的关联:$mathbf{O}_{mathbf{3}}$对NMHC的敏感性高于$mathbf{NO}_{mathbf{x}}$

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118538

M. Mishra, T. Das, R. Boopathy

{"title":"Seasonal day-night variation of ozone $(mathbf{O}_{mathbf{3}})$ in an eastern urban site, Bhubaneswar and its association with precursors ($mathbf{NO}_{mathbf{x}}$ and NMHC): More sensitivity of $mathbf{O}_{mathbf{3}}$ to NMHC than $mathbf{NO}_{mathbf{x}}$","authors":"M. Mishra, T. Das, R. Boopathy","doi":"10.23919/URSI-RCRS56822.2022.10118538","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118538","url":null,"abstract":"The study reports on the relationships between surface ozone $(mathrm{O}_{3})$ and its principal precursors, nitrogen oxides $(text{NO}_{mathrm{x}})$ and non-methane hydrocarbons (NMHCs), due to their scientific importance, in addition to the implementation of policies aimed at reducing $mathrm{O}_{3}$ pollution. Measurements and analyses of the mentioned trace gases revealed correlations between them in a city in Eastern India, Bhubaneswar, from October 2021 to May 2022. It demonstrates sensitivity to NMHCs when compared to $text{NO}_{mathrm{x}}$ as a whole. The $text{NMHC} /text{NO}_{mathrm{x}}$ ratios confirm NMHC dominance in pre-winter and winter, while $text{NO}_{mathrm{x}}$ dominance is confirmed in summer (post-winter). A multivariate regression approach was also utilised to develop a model to predict $mathrm{O}_{3}$ concentrations based on precursor concentrations, which offers significant information on the precursors ($text{NO}_{mathrm{x}}$ and NMHCs) that contribute to $mathrm{O}_{3}$ synthesis. The slope and intercept derived from the prediction model indicatethat, while these precursors can explain a significant portion of the concentration, there are other unidentified contributions from other precursors and some mysterious chemical activities going on (especially at night) that has remained unrevealed. Thus, the study emphasizes the necessity of identifying additional precursors via other methodologies such as remote sensing and limiting NMHC emissions, which could play a crucial role in both understanding and lowering ground-level ozone in the current scenario.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"112 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":"128697047","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

Signal Strength Variations and Data Bit Synchronization Issues of High Dynamic NavIC/GPS Receiver During Ascent Phase of a Launch Vehicle Trajectory 高动态NavIC/GPS接收机在运载火箭轨道上升阶段信号强度变化和数据位同步问题

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118481

Vinoj V S, Biju V S, M. Basim, A. Ot, C. R. Pillai, S. Sasikumar

{"title":"Signal Strength Variations and Data Bit Synchronization Issues of High Dynamic NavIC/GPS Receiver During Ascent Phase of a Launch Vehicle Trajectory","authors":"Vinoj V S, Biju V S, M. Basim, A. Ot, C. R. Pillai, S. Sasikumar","doi":"10.23919/URSI-RCRS56822.2022.10118481","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118481","url":null,"abstract":"One of the most important and challenging part of NavIC/GPS receiver design is the tracking loop realization. NavIC/GPS data bit identification is the terminal phase of tracking loop algorithm. Basic time synchronization between the particular satellite time which is tracked by a channel and receiver local time is achieved using the data bit boundary identification. The probability of inducing error in navigation solution is more if low elevation/low CNDR satellites signal is used for navigation computation. Normally high dynamic GNSS receivers use elevation limit to avoid low elevation satellites, but this may not be always applicable when the receiver is employed in launch vehicles which is having different maneuvers during the trajectory. In such cases when the receiver tracks low elevation satellites, there can be noise induced errors, which lead to misinterpretation of data bits leading to incorrect time synchronization for that particular channel. This leads to error in transmit time computation and further it will affect the position solution as well. The signal strength analysis of a typical NavIC/GPS receiver during the ascent phase of launch vehicle is studied and the possibility of bit synchronization issues during the flight/during ground testing is brought out and mitigation techniques are presented in this paper.","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":"125109752","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

Effect of Doppler Collision in Satellite navigation systems 卫星导航系统中多普勒碰撞的影响

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118492

N. Kasat, Aakanksha Avnish Bhardwajan, Suresh Dakkumalla, T. Ganesh, F. B. Singh, M. R. Raghavendra

引用次数: 0

New Insights on the Precursors to the Onset of Equatorial Plasma Irregularity Generation 关于赤道等离子体不规则产生的前兆的新见解

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118477

D. Pallamraju, S. Mandal, S. Saha, S. Kumar, T. Pant

引用次数: 0

Surface Crack Characterization of Aluminium Specimen using Passive Wireless RFID based Tag Antenna Sensor 基于无源无线射频识别标签天线传感器的铝试样表面裂纹表征

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118559

Setti Suresh, G. Chakaravarthi

引用次数: 0

Forced KdV equation in magnetorotating electron-positron-ion plasmas 磁旋电子-正电子-离子等离子体中的强迫KdV方程

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118445

G. Slathia, Second Rajneet Kaur, Third Sunidhi Singla, Fourth Manveet Kaur, fifth N. S. Saini

引用次数: 0