2022 URSI Regional Conference on Radio Science (USRI-RCRS)最新文献_第5页

Frequency Reconfigurable Printed Monopole Antenna using a Quarter Wave Stub Resonator 使用四分之一波短根谐振器的频率可重构印刷单极天线

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118435

R. Jawale, J. Padhi, Awanish Kumar

引用次数: 0

A Two Step Stair Shaped Dielectric Resonator Antenna with AMC for UWB Applications 一种用于超宽带应用的两阶阶梯形介质谐振器天线

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118471

P. Kumari, R. Gangwar, R. Chaudhary

引用次数: 0

An Efficient Search for the Faint Population of Long Period Pulsars 对长周期脉冲星微弱群的有效搜索

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118534

Shubham Singh, J. Roy, Ujjwal Panda, B. Bhattacharyya

{"title":"An Efficient Search for the Faint Population of Long Period Pulsars","authors":"Shubham Singh, J. Roy, Ujjwal Panda, B. Bhattacharyya","doi":"10.23919/URSI-RCRS56822.2022.10118534","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118534","url":null,"abstract":"The conventional periodicity search, based on the fast Fourier transform (FFT) of the time series, has two major drawbacks while searching for long period pulsars. Long period pulsars often have short duty cycles and the FFT based search with harmonic summing over a limited harmonic space is less sensitive for short duty cycles. The FFT search is also highly vulnerable to rednoise in the radio telescope data, reducing its sensitivity for longer periods. Since the current population of radio pulsars is mostly discovered by the FFT based search, there is a strong possibility of a missing population of long period and short duty cycle pulsars. An alternative search method for non-accelerated periodic signals is the fast folding algorithm (FFA), which has a uniform response for all periods and duty cycles. The FFA search provides an unbiased way to search for periodic signals with superior sensitivity. Though sufficiently bright population of long period pulsars can be discovered in single pulse searches, a suitable periodicity search along with an increase in integration time per pointing is required in major pulsar surveys to discover the fainter population of long period pulsars.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"23 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":"128982215","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

Variation of Aerosol Optical Depth and Radiative Forcing Over Indo-Gangetic Plain using AERONET 基于AERONET的印度恒河平原气溶胶光学深度和辐射强迫变化

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118473

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

{"title":"Variation of Aerosol Optical Depth and Radiative Forcing Over Indo-Gangetic Plain using AERONET","authors":"S. Prajapati, Akhilesh Kumar, P. K. Chauhan, Ashutosh Kumar Singh","doi":"10.23919/URSI-RCRS56822.2022.10118473","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118473","url":null,"abstract":"Aerosols play a crucial role in the atmosphere and significantly modify the earth's radiation budget. Due to their scattering and absorbing nature, aerosols have a significant impact on the global climate. In the present work, the monthly variation of aerosol properties has been studied over three different sites of Indo-Gangetic Plain (IGP): Kanpur, Jaipur, and Gandhi College respectively using ground-based Aerosol Robotic Network (AERONET) data. The spectral variations of Aerosol Optical Depth (AOD) with different seasons have been analyzed from June 2020 to May 2021. The high value of AOD at shorter wavelength and low value of AOD at longer wavelength was found which suggest dominancy of fine particles in the winter season and dominancy of coarse particles in the summer season. The monthly variation of Aerosol Radiative Forcing (ARF) along with trends over Kanpur, Jaipur, and Gandhi College has been analyzed. Total atmospheric radiative forcing $(text{ARF}_{text{ATM}})$ over all the locations was found to be positive suggesting warming in the atmosphere. The trend of ARF over Jaipur was found to be significantly decreasing while the trend of ARF over Kanpur and Gandhi College is insignificant. The correlation between AOD and $text{ARF}_{text{ATM}}$ was calculated. It is found that Aerosol Radiative Forcing is directly proportion to the Aerosol Optical Depth having a correlation coefficient of $mathrm{R}^{2} > 60$ % which suggests that aerosols can modify the Earth's radiation budget significantly.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"446 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":"116330083","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

Potential of GNSS Post Processing Kinematic (PPK) Technique for Test Range Surveying Applications using Compact, Low Cost GNSS Modules 使用紧凑、低成本GNSS模块的GNSS后处理运动学(PPK)技术在测试测距应用中的潜力

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118459

Aiswarya S Pillai, Somnath Mahato, Mrinal Goswami, Prabal Banerjee, A. Bose

{"title":"Potential of GNSS Post Processing Kinematic (PPK) Technique for Test Range Surveying Applications using Compact, Low Cost GNSS Modules","authors":"Aiswarya S Pillai, Somnath Mahato, Mrinal Goswami, Prabal Banerjee, A. Bose","doi":"10.23919/URSI-RCRS56822.2022.10118459","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118459","url":null,"abstract":"The evolution of multiple global and regional GNSS constellations over the last two decades has transformed the positioning, navigation, and timing (PNT) technology unprecedently by introducing an unmatched combination of precision, accuracy, convenience, and confidence. Various methods and techniques like use of dual frequency, ionospheric error-free standard positioning service (SPP/SPS), real time kinematic (RTK), and precise point positioning (PPP) have increased the level of accuracies and precision in both static and dynamic operations. This study explores the potential of dual frequency Post Processing Kinematic (PPK) RTK positioning for test range applications using compact, low cost, dual frequency (CLD), multi-constellation GNSS modules. The results show centimeter-level solution accuracy; the results would be useful in enhancing the confidence of using such systems for various applications where real time wireless connectivity between the Base and Rover is not available, or in cases where the real time connectivity between the RTK Base and Rover poses cyber security threats.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"11 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":"117125697","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 Autoregressive Integrated Moving Average (ARIMA) Based Forecasting of Ionospheric Total Electron Content at a low latitude Indian Location 基于自回归综合移动平均(ARIMA)的印度低纬度电离层总电子含量预报

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118532

R. Vankadara, S. Sasmal, A. Maurya, S. Panda

{"title":"An Autoregressive Integrated Moving Average (ARIMA) Based Forecasting of Ionospheric Total Electron Content at a low latitude Indian Location","authors":"R. Vankadara, S. Sasmal, A. Maurya, S. Panda","doi":"10.23919/URSI-RCRS56822.2022.10118532","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118532","url":null,"abstract":"Ionospheric total electron content (TEC) plays an important role in introducing delay errors in space-based navigation and communication signals and requires early forecasting of the plausible impacts on the relying systems. In the present work, an autoregressive integrated moving average (ARIMA) is implemented in the time series analysis to forecast the TEC at an Indian low latitude location (KL University, Guntur; Geographic 16.37°N, 80.37°E) during the quiet (5–9 January 2021) and disturbed (3–7 March 2022) geomagnetic conditions. The performance of the model is evaluated from the biases, root mean square error (RMSE), and correlation coefficients between model forecast and observed TEC. The results show that bias remains between -3 to +3 TECU and +2 to-4 during quiet and disturbed days, respectively. The corresponding RMSE values are within a limit of 5 TECU and 6 TECU. The occurrence of plasma irregularities is also verified by analyzing the scintillation indices during the period. A further analysis refinement of the model is aimed to improve the forecasting accuracy over the region.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"63 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":"114822851","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

Broadband Wide angle Polarization insensitive Metamaterial Absorber for K band application 用于K波段的宽带广角偏振不敏感超材料吸收器

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118480

Laxmikant Dewangan, N. Mishra

{"title":"Broadband Wide angle Polarization insensitive Metamaterial Absorber for K band application","authors":"Laxmikant Dewangan, N. Mishra","doi":"10.23919/URSI-RCRS56822.2022.10118480","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118480","url":null,"abstract":"This paper focuses on the design and analysis of a strictly polarization-insensitive with broad angular stability broadband metamaterial absorber for the application of the K band. The unit cell of the metamaterial-absorber consisting of a symmetrically arranged ladder shape structure of copper is imprinted on a metal-backed FR-4 substrate. Wide absorption bandwidth of 7 GHz ranging from 21.20 GHz to 28.20 GHz, covering the K-band, is observed under normal incidence. The absorption capability of the proposed structure is more than 91% for TE and TM polarized waves under normal incidence. Electromagnetic field and surface current distribution (Top and Bottom) are exhibited to understand the absorption mechanism of the proposed structure. The proposed design is four-fold symmetric and shows polarization insensitivity for different angles of $Phi$ from 0° to 90° for TE and TM polarized waves. Moreover, the structure illustrates more than 60% absorption under oblique incidence angles from $theta=0^{circ}$ to 90° for both TE and TM polarized waves. The thickness of the proposed absorber is $lambda 0/8$, corresponding to the center frequency, making it compact and suitable for commercial applications like Radar Cross Section reduction and energy harvesting applications in the K band.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"19 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":"128062173","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

Orbit Propagator Coefficients for Earth Orbiting Satellites 地球轨道卫星的轨道传播系数

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118509

P. Mishra, B. N. Ramakrishna, N. Harinath, Sharda Vashisth, A. Gupta

{"title":"Orbit Propagator Coefficients for Earth Orbiting Satellites","authors":"P. Mishra, B. N. Ramakrishna, N. Harinath, Sharda Vashisth, A. Gupta","doi":"10.23919/URSI-RCRS56822.2022.10118509","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118509","url":null,"abstract":"The orbit of GNSS ephemerides are provided in RINEX format at every 15min interval for next two days at IGU website on daily basis for public use. The extraction of position and velocity information of GNSS satellites at given time require separate algorithms which depend on precision of several universal constant parameters and many coordinate transformation. In this paper we have developed an algorithm to estimate finite number of satellite Orbit Propagator Coefficients (OPC) accounting full force perturbative forces. Based on these coefficients user can derive satellite position for the required time within given period time with good accuracy. In this paper firstly we have propagated the orbit of earth orbiting satellites using in-house developed full force model, subsequently estimated 23 numbers of OPC within propagation period. Finally we have compared the position derived from OPC with high-precise RINEX files of GNSS satellites and also with operational ephemerides for LEO satellites with very close match. The estimated OPC requires very less run-time for satellite position time unlike any high precise numerical propagator and therefore it can be utilised for satellite on-board navigation for micro/nano satellites.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"103 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":"123621891","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

In-Band Full-Duplex Antenna Using Orthogonal U-shaped Slot Antenna 采用正交u型槽天线的带内全双工天线

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118493

D. Prasad, H. V. Singh, S. Tripathi, P. Paltani

{"title":"In-Band Full-Duplex Antenna Using Orthogonal U-shaped Slot Antenna","authors":"D. Prasad, H. V. Singh, S. Tripathi, P. Paltani","doi":"10.23919/URSI-RCRS56822.2022.10118493","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118493","url":null,"abstract":"In this paper, a new design is proposed for the in-band full-duplex antenna for 5G communication systems. The proposed two-port in-band full-duplex antenna consists of orthogonally arranged two U-shaped slot sections which are fed by coupled microstrip lines. The microstrip-coupled coplanar waveguide (CPW) is used at both ports to excite the U-shaped stepped-slot sections in the CPW odd mode. The surface currents from the active port interact with the other port in CPW even mode and result in neutral electromagnetic coupling from the stepped slot to the microstrip line. The interport isolation is achieved by CPW odd mode excitation of the individual stepped slot and it is further improved by the orthogonal arrangement of stepped slots. The proposed antenna has a minimum of 39 dB of interport isolation over the entire operational band and a maximum of 47 dB at 3.52 GHz. The -10 dB impedance bandwidth of both ports is 370 MHz and resonates in the 5G band of (3.32-3.69) GHz. The design provides the broadside radiation pattern with cross-polar content of less than -20 dB. The gain of the antenna for port1 and port2 is 3.8 dBi and 4.5 dBi, respectively at 3.52 GHz.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"96 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":"123765981","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

Ionospheric Disturbances during X1.5 Class Solar Flare of 3 July 2021 2021年7月3日X1.5级太阳耀斑期间的电离层扰动

2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118497

S. S. Rao, Monti Chakraborty

引用次数: 0