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2022 URSI Regional Conference on Radio Science (USRI-RCRS)最新文献

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Gauribidanur Pulsar System 高里比都努尔脉冲星系统
2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118458
Kshitij S. Bane, I. V. Barve, G. Gireesh, Chinnadurai Kathiravan, R. Ramesh
{"title":"Gauribidanur Pulsar System","authors":"Kshitij S. Bane, I. V. Barve, G. Gireesh, Chinnadurai Kathiravan, R. Ramesh","doi":"10.23919/URSI-RCRS56822.2022.10118458","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118458","url":null,"abstract":"A dedicated system for observations of Pulsars and other astrophysical transients in the frequency range of 50–80 MHz has been recently commissioned at the Gauribidanur Radio Observatory near Bangalore, India. One of the salient features of the system is digital delay beamforming to simultaneously phase the antenna response pattern (“beam”) to different directions in the sky as compared to the generic cable phase/delay shifters which help to observe only a particular direction of the sky at a given epoch. Mechanical steering is difficult for the large antenna arrays used at low frequencies. The work reported is expected to provide useful inputs for similar work with SKA-Low.","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":"124118101","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
Compressive Sensing Based 2-D DOA Estimation by a Sparse L-Shaped Co-prime Array 基于压缩感知的稀疏l形共素阵列二维DOA估计
2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118452
S. Ganguly, I. Sarkar, P. Kumar, J. Ghosh, Mainak Mukhopadhyay
{"title":"Compressive Sensing Based 2-D DOA Estimation by a Sparse L-Shaped Co-prime Array","authors":"S. Ganguly, I. Sarkar, P. Kumar, J. Ghosh, Mainak Mukhopadhyay","doi":"10.23919/URSI-RCRS56822.2022.10118452","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118452","url":null,"abstract":"Herein, two-dimensional direction-of-arrival (DOA) estimation of impinging signals on a L-shaped coprime array structure, in compressive sensing paradigm is explored. The received signals are compressed generating appropriate kernel in the L-shaped coprime array model. Suitable reconstruction algorithms based on single snapshot are then employed on the compressed signals to develop high resolution DOA estimation in two dimensions. Simulation results in terms of probability of resolution exhibits much better performance as compared with the standard two-dimensional compressive sensing model of DOA estimation using an L-shaped array antenna.","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":"130729025","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
Application of the neural network on the GNSS-Reflectometry data for the estimation of the significant wave height 神经网络在gnss反射数据中有效波高估计中的应用
2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118466
Megha Maheshwari, Akhil Kumar, A. Chakraborty, Nirmala Srini
{"title":"Application of the neural network on the GNSS-Reflectometry data for the estimation of the significant wave height","authors":"Megha Maheshwari, Akhil Kumar, A. Chakraborty, Nirmala Srini","doi":"10.23919/URSI-RCRS56822.2022.10118466","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118466","url":null,"abstract":"Globally, remote sensing is the best way to estimate Significant Wave Height (SWH). Traditional sensors such as satellite altimeters are generally used to provide SWH. However, due to poor temporal resolution and poor signal quality during heavy rain, altimeters signals are not suitable during heavy rain condition. To overcome above limitations, Global Navigation Satellite System-Reflectometry (GNSS-R) is widely used to generate the ocean parameters. However, due to the poor range resolution of GNSS-R signals, GNSS-R requires complex algorithm to generate SWH. In this paper, a Neural Network (NN) based machine learning technique is proposed to estimate the SWH using Cyclone GNSS (CYGNSS) observables. Levenberg-Marquardt algorithm is applied to train and update the weight function and bias of the network. Optimum number of layers and nodes in each layer are selected by the criteria which minimize the error of the output of the NN. Once the network is formed, the estimated SWH is validated using SWH of WW-3 model. The training data gives the Correlation Coefficients (CC) equals to 0.91 and Root Mean Square Difference (RMSD) equals to 0.35 m. The validation data gives the RMSD and the Mean Error (ME) equals to 0.36 m and -0.002 m respectively. NN output is also compared with Jason-3 altimeter SWH data. The analysis shows that similar to altimeter, GNSS-R signals can also be used to generate SWH.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"57 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":"131379994","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
Timing performance and stability characterization of an In house realized NavIC Timing Receiver 国产导航定时接收机的定时性能与稳定性
2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118446
Suresh Dakkumalla, Aakanksha Avnish Bhardwajan, Prem Ranjan Dubey, Rajath Sadasivan, T. Ganesh, M. R. Raghavendra
{"title":"Timing performance and stability characterization of an In house realized NavIC Timing Receiver","authors":"Suresh Dakkumalla, Aakanksha Avnish Bhardwajan, Prem Ranjan Dubey, Rajath Sadasivan, T. Ganesh, M. R. Raghavendra","doi":"10.23919/URSI-RCRS56822.2022.10118446","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118446","url":null,"abstract":"Navigation with Indian Constellation (NavIC), also known as Indian Regional Navigation Satellite System (IRNSS), is the Indian regional satellite navigation system. A NavIC Timing receiver is a type of user receiver which realizes NavIC system time on ground by steering its internal oscillator to the NavIC system time. These receivers act as NavIC based time reference. In order to reduce the dependency on other GNSS based timing references, a NavIC Timing receiver has been developed in-house at ISTRAC for use at all ground facilities. This paper provides an assessment of the timing performance and stability characterization of this NavIC Timing receiver.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"1075 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":"122890066","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
Characterization of Mango Orchard Biophysical Parameters using NovaSAR-1 S-Band data 利用NovaSAR-1 s波段数据表征芒果园生物物理参数
2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118537
Steena Stephen, D. Haldar
{"title":"Characterization of Mango Orchard Biophysical Parameters using NovaSAR-1 S-Band data","authors":"Steena Stephen, D. Haldar","doi":"10.23919/URSI-RCRS56822.2022.10118537","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118537","url":null,"abstract":"This study evaluates the ability of S-band SAR data to characterize the biophysical parameters of Mango orchards. The observations from the correlation matrix of NovaSAR-1 parameters and the biophysical parameters indicate that height had the strongest correlation with VV (-0.40) in comparison to the other biophysical parameters. Based on the testing of models, MLR (Multiple Linear Regression) yielded the best RMSE (0.47m) and MAE (0.68m) in the estimation of height with the parameter's Co-pol index and HH backscatter. In the case of DBH, RFR (Random Forest Regression) gave the highest RMSE (0.23m) and MAE (0.05m) with HH and co-pol index. A comparison between the VV backscatter using S-band and C-band data (obtained from Sentinel-1) was also carried out for the mango orchard with S-band data having a higher dynamic range than C-band data.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"55 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":"126232608","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 variations during geomagnetic storms of 7–8 September, 2017 2017年9月7-8日地磁暴期间电离层变化
2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/ursi-rcrs56822.2022.10118457
Barsha Dutta, Rumajyoti Hazarika, B. R. Kalita, K. Bhuyan, P. Bhuyan, Aditi Pandey, Adrika Kakoty
{"title":"Ionospheric variations during geomagnetic storms of 7–8 September, 2017","authors":"Barsha Dutta, Rumajyoti Hazarika, B. R. Kalita, K. Bhuyan, P. Bhuyan, Aditi Pandey, Adrika Kakoty","doi":"10.23919/ursi-rcrs56822.2022.10118457","DOIUrl":"https://doi.org/10.23919/ursi-rcrs56822.2022.10118457","url":null,"abstract":"Two very intense solar flares of magnitudes X2.2 and X9.3 erupted on September 6, 2017 at 09:10 UT and 12:02 UT triggering large space weather modulations on earth. We analyze the ionospheric response to the geomagnetic storm event that occurred post the flares on 7–8 September 2017 on five selected stations in the northern (Lhasa, Lucknow, Dibrugarh, Quezon City) and southern hemisphere (Cocos). This storm occurred just after the X9.3 solar flare on 6th September. The following figure represents the effect of the storm on Vertical Total Electron Content. It is seen that the VTEC increased significantly on 6-7 September in the northern hemisphere while TEC remained nearly uniform in the southern hemisphere. The TEC decreased on 8–10 September in the NH while in the SH, TEC decreased on 9th and then increased on 10th onwards. There is a sudden risein the average VTEC on 11th September more than pre flare levels in all stations. Ionograms obtained over Cocos showed that for the solar flare day E layer disappears whereas, for geomagnetic storm days sporadic E is observed. The inter hemispheric asymmetric variation in TEC and E layer activities over Cocos are further examined using electron density profiles, maximum electron concentration (NmF2) and data from COSMIC, GRACE and SWARM satellites. The results from this comprehensive analysis will be presented.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"34 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":"114557836","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
Microwave Food Processing and Effect of Pathogens in Dielectric Properties 微波食品加工及病原菌对介电特性的影响
2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118436
Ranjani Hilda Mary, K. Raghava, G. Babu, D. Kumar
{"title":"Microwave Food Processing and Effect of Pathogens in Dielectric Properties","authors":"Ranjani Hilda Mary, K. Raghava, G. Babu, D. Kumar","doi":"10.23919/URSI-RCRS56822.2022.10118436","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118436","url":null,"abstract":"The Objective of this study was to investigate the effect of food's dielectric characteristics on the effectiveness of inactivation of foodborne pathogens in white bread when subjected to microwave energy and measuring the variation in the reflection coefficient to determine the absorption impact of fresh and pathogenic bread to extending the bread shelf-life. At Microwave frequencies and temperatures between 25 and 85 degrees Celsius, while having a variety of dielectric properties, moisture content, the conventional and metamaterial antennas are designed using the Computer Simulation Technology (CST) microwave studio. The results show the comparison of traditional and metamaterial infused antennas in terms of gain, reflection coefficient, radiation efficiency, antenna size, and absorption efficiency. These study shows how microwave heating and the Split Ring Resonator (SRR) metamaterial effect on inactivate pathogens without affecting the food's nutrient benefit and how heating can affect dielectric properties.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"14 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":"114411970","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
SI second: from microwave towards optical realization SI秒:从微波到光学实现
2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118582
P. Arora, S. Yadav, Navraj Poudel, Aniket Gupta, M. Das, V. Bharath, A. Agarwal, Amitava Sen Gupta
{"title":"SI second: from microwave towards optical realization","authors":"P. Arora, S. Yadav, Navraj Poudel, Aniket Gupta, M. Das, V. Bharath, A. Agarwal, Amitava Sen Gupta","doi":"10.23919/URSI-RCRS56822.2022.10118582","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118582","url":null,"abstract":"Present definition of SI second is based on the hyperfine transition frequency (in the microwave region) in Cesium atoms since 1967. In the last two decades, frequency standards based on optical transition have shown remarkable progress by outperforming the best microwave frequency standard by at least an order of magnitude in terms of relative frequency uncertainty. This paper presents an insight on the present realization of a microwave SI second and the roadmap towards future realization based on optical transition frequencies.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"22 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":"123941514","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
2-D blue Phosphorene/Molybdenum Disulfide (BlueP/MoS2) Hybrid Structure with Enhanced Sensitivity based on SPR for Chemical Sensing 基于SPR的二维蓝色磷二烯/二硫化钼(BlueP/MoS2)杂化结构的化学传感
2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118549
Mohan Kumar Paswan, R. Basu
{"title":"2-D blue Phosphorene/Molybdenum Disulfide (BlueP/MoS2) Hybrid Structure with Enhanced Sensitivity based on SPR for Chemical Sensing","authors":"Mohan Kumar Paswan, R. Basu","doi":"10.23919/URSI-RCRS56822.2022.10118549","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118549","url":null,"abstract":"SPR (surface Plasmon resonance) based sensors have a significant role in sensing applications in real-time monitoring. Label-free detection and repeatable measurements. Chemical produced in fruits during food adulteration is detrimental to the health; hence, SPR sensors play a vital role in detecting these chemicals. In the present study, two-dimensional (2D) materials-based, such as black phosphorus (B.P.), the optimized structure of the SPR-based chemical sensor with the increased sensitivity and better figure of merit (FOM), have been proposed. The Heterostructure of the Blue P and 2D materials has enhanced the sensitivity. The excellent performances can be achieved by accurate the silver film thickness and the number of interlayers. In this configuration, the Blue Phosphorene/MoS2 Heterostructure with a silver metal layer and the B.P. layer. Simulation of the adapted structure's sensitivity properties using angular interrogation reveals that the sensitivity can be improved highly with the new design. Moreover, the number of Blue Phosphorene/MoS2 layers for best simulation results is also clarified. The maximum sensitivity of the proposed optimized structure has been found at 458 Degree/RIU for the $5 times 10^{-3}$ index variation at the wavelength of $662nm$. The results from the proposed structure show that the Sensor can enhance the sensitivity of the aqueous solution of the chemicals having the refractive index from $1.33 RIU$ to $1.36 RIU$.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"2 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":"115066612","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
Time-Efficient Comnutation of EOS-04 Cross-Polarization Imbalance EOS-04交叉极化不平衡的时间效率计算
2022 URSI Regional Conference on Radio Science (USRI-RCRS) Pub Date : 2022-12-01 DOI: 10.23919/URSI-RCRS56822.2022.10118513
Himanshu Sharma, Yogendra Sahu, Vetal Akshay Pandit, Ashok Rohada, A. Kesarkar, P. Nandy, S. Shukla, J. Rao, P. Nath, R. Bhan, C. V. Rao
{"title":"Time-Efficient Comnutation of EOS-04 Cross-Polarization Imbalance","authors":"Himanshu Sharma, Yogendra Sahu, Vetal Akshay Pandit, Ashok Rohada, A. Kesarkar, P. Nandy, S. Shukla, J. Rao, P. Nath, R. Bhan, C. V. Rao","doi":"10.23919/URSI-RCRS56822.2022.10118513","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118513","url":null,"abstract":"Measurement of Cross-Polarization Imbalance (CPI) of the phased array antenna is a critical step during SAR payload characterization. In this paper, we demonstrate a time-efficient measurement scheme of H-V CPI for EOS-04 antenna via single 2-D raster-scan near-field measurements. The set-up utilizes full-polarization mode of EOS-04 payload and a dual polarized probe for this purpose.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"14 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":"115106458","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
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