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

{"title":"Streaming Instability Generation in Lunar Plasma Environment","authors":"Mehul Chakraborty, V. Yadav, R. Kumar","doi":"10.23919/URSI-RCRS56822.2022.10118524","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118524","url":null,"abstract":"Plasma instabilities are the non-linear processes occurring in plasmas when excess energy gets accumulated in a plasma system which is unable to hold it. There are almost 60 known plasma instabilities in nature.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"44 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":"129798084","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}

{"title":"A Low Cross Polarized Reflection Wideband Microwave Absorber","authors":"S. Mishra, S. Maity","doi":"10.23919/URSI-RCRS56822.2022.10118561","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118561","url":null,"abstract":"A polarization-insensitive absorber operating in a microwave frequency regime having a large absorption bandwidth is presented in this work. On top of the substrate, a Frequency Selective Surface (FSS) pattern is printed which constitutes two resistive sheet-based resonators that produce ohmic loss, which significantly increases the absorption bandwidth. The absorber is angularly stable up to a maximum of 60 degrees, both for TE and TM polarizations, however, the TM case is more stable. The cross-polarized reflection coefficient level clearly shows that the proposed model functions as an absorber from (9.68 GHz - 20.72 GHz) rather than a polarization converter.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"54 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":"127683560","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}

{"title":"Study of Sporadic E layer effect on the F layer during 23rd June 2015 geomagnetic storm event","authors":"T. V. Rao, M. Sridhar, D. Ratnam, B. S. Kumar","doi":"10.23919/URSI-RCRS56822.2022.10118540","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118540","url":null,"abstract":"Investigating the sporadic E (Es) layer effect on the F layer during a geomagnetic storm event is essential to understanding the impact of ionospheric irregularities on trans-ionospheric radio communication and navigation systems. In equatorial and low latitude regions, the enhancement in the F layer leads to the development of equatorial spread F (ESF), and the F layer suppression leads to the inhibition of ESF. The Es layer and ESF events recorded by the Canadian Advanced Digital Ionosonde (CADI) system located at low latitude Hyderabad, India (Lat: 17.47°N, Long: 78.57°E) region and co-located global positioning system (GPS) amplitude scintillations index (S4) parameters during 23rd June 2015 geomagnetic storm event are considered in the present analysis. The suppression of spread F due to the presence of Es and subsequent inhibition of amplitude scintillations were examined during adverse space weather conditions from 22nd to 24th June 2015. It is observed from the analysis results that the amplitude scintillations at the low latitude region were inhibited due to the suppression of spread F in response to the development of the Es layer during the considered geomagnetic storm event. The Es and ESF parameters are supporting input parameters to ionospheric prediction or forecasting models and can be used to initiate the scintillation alerts in GPS and High Frequency (HF) communication applications.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"16 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":"128624610","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}

{"title":"Ionosphere Modelling using Spherical harmonics with in-equality constraints over IRNSS service area","authors":"Gurpreet Singh, Megha Maheshwari, Nirmala Srini","doi":"10.23919/URSI-RCRS56822.2022.10118536","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118536","url":null,"abstract":"The ionosphere is a part of the atmosphere composed of free electrons and ions. Due to its ionized character, it affects the propagation of the radio signals passing through it. Therefore, for a satellite navigation system, ionosphere error corrections are required to accurately determine the user's position. The Indian Regional Navigation Satellite System (IRNSS) is an independent, regional navigation system meant to provide user position for single frequency as well as dual frequency users. In order to reduce errors in the user position, IRNSS provides two types of ionospheric corrections: Grid based as well as ionosphere coefficient based on L5 frequency. Users are advised to use grid based correction as compared to the coefficient based correction since grid based corrections are more accurate than coefficient based. In IRNSS, kriging method is applied to generate an ionosphere grid at IRNSS service area. However, spherical harmonics based ionosphere grid data is also frequently used by researchers worldwide. These geo-statistical methods (kriging and spherical harmonics) are equally good for the reconstruction of the global ionosphere data. However, the superiority of any of the geo-statistical methods over the other geo-statistical methods for the reconstruction of regional ionosphere data has not been explored enough. Therefore, in this paper, we reconstructed the ionosphere map over the IRNSS service area using a spherical harmonics method. Since the IRNSS service area lies in the ionosphere equatorial anomaly region, we directly implement non-negative physical constraints of the ionosphere in our algorithm. Mathematically, an inequality-constrained least squares method is proposed by imposing non-negative inequality constraints in the areas to avoid negative vertical Total Electron Content (TEC) values. The proposed technique utilizes a priori information from the Global Ionosphere Maps (GIM) of the Center for Orbit Determination in Europe (CODE). The GIM map has been degraded randomly to compare our techniques for reconstruction of TEC maps.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"295 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":"132209721","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}

{"title":"Design and analysis of Resistive Probe for Specific Absorption Rate Evaluation","authors":"Abhishek Jain, A. Mishra, S. Dubey","doi":"10.23919/URSI-RCRS56822.2022.10118573","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118573","url":null,"abstract":"With the advent of artificial intelligence and its association with multiple wireless devices has created a complex radio frequency (RF) environment. Due to this, RF exposure evaluation in the near field domain has become more critical. Specific Absorption Rate (SAR) is the parameter required to be evaluated to measure the near field RF exposure. In the proposed work we have designed an E-field probe for SAR evaluation associated with 5.8 GHz (Wi-Fi for 5G). Scattering parameters for the probe are reported in this work. A detailed description of SAR evaluation system has been given along with different scans setups for SAR evaluation. An automatic routine for SAR evaluation has been under development for enabling autonomous SAR evaluation using the designed probe. Further analysis will be reported in the extended paper.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"4 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":"133592526","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}

{"title":"Biological Liquid Monitoring using Microwave Resonator","authors":"Shalini Patel, Soumyadeep Das, Debasis Mitra, Subhasis Sarkar, C. Koley","doi":"10.23919/URSI-RCRS56822.2022.10118568","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118568","url":null,"abstract":"For dielectric characterisation of liquids, a novel microwave sensor is designed on the concept of metamaterial (MTM) by using complementary split ring resonator (CSRR). This work describes an MTM based high-sensitivity microwave sensor with a PDMS channel that can be used for any kind of liquid detection and in a number of biomedical applications. On the ground plane of a dielectric substrate, three CSRRs with squared shapes are engraved. A planar microstrip-line (MTL) carved on the substrate's bottom side generates a time-varying electric field that is connected to the sensor cells to stimulate them. The sensor has been built on a Rogers RT6002 dielectric substrate. The sensitivity of the proposed sensor is demonstrated in laboratory tests with a variety of liquid samples using a Vector Network Analyzer (VNA) setup, where the frequency is different for different dielectric constants. The designed sensor has a remarkable ability to detect minor dielectric variations, in addition to having other beneficial qualities including compact size, easy manufacture, cheap, nonionizing nature, and no risk to human health. The use of the proposed sensor along with additional microwave components for non-invasive disease diagnosis may be encouraged by such crucial properties.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"32 6 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":"134522712","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}

{"title":"Atmospheric Column Water Vapor Retrieval using Atmospheric Precorrected Differential Absorption Technique from AVIRIS-NG Data","authors":"Jalpesh A. Dave, M. Pandya, Hasmukh K. Varchand, Parthkumar Parmar, H. Trivedi, V. Pathak","doi":"10.23919/URSI-RCRS56822.2022.10118440","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118440","url":null,"abstract":"In this paper, the atmospheric column water vapor (WV) has been retrieved using atmospheric precorrected differential absorption (APDA) technique from the hyperspectral data of Next-Generation Airborne Visible/Infrared Imaging Spectrometer (AVIRIS-NG). The APDA technique is extended method of Continuum interpolation band ratio (CIBR), and it is based on Linear regression ratio (LIRR) method. In APDA the additional atmospheric precorrected term reduces atmospheric path radiance, which provides good accuracy over lower surface albedo. Moreover owing to use of more than three absorption bands, this technique gives better performance over large surface reflectance variation. Optimum absorption bands selection has been performed by derived at-sensor radiance using MODTRAN (MODerate resolution atmospheric TRANsmission) 5.3 radiative transfer model (RTM), and six WV absorption bands are selected between 1120nm to 1150nm. At-sensor radiance simulations have been carried out for varying atmospheric and surface parameters, and then a band ratio RAPDA is derived from absorbing and non-absorbing band, corresponding to different WV concentration. The theoretical validation of the technique has been performed using actual radiosonde WV values, which shows good agreement with a root mean square error (RMSE) of 0.0145 gm/cm2. The technique has been first-time applied to AVIRIS-NG Indian campaign data containing heterogeneous surface of two sites of Ahmedabad and Anand. Validation of retrieved WV was carried out with the NASA's AVIRIS-NG level-2 WV products on pixel-to-pixel basis. The RMSE for Ahmedabad and Anand is 0.164 gm/cm2 and 0.112 gm/cm2, respectively, which demonstrates a good performance of the proposed technique for the WV retrieval.","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":"129692757","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}

{"title":"Terahertz Electromagnetic (EM) Wave Absorber Based Biological Sensor for Cancer Detection Application","authors":"Awanish Kumar, J. Padhi, R. Jawale, G. Reddy","doi":"10.23919/URSI-RCRS56822.2022.10118560","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118560","url":null,"abstract":"This work presents a terahertz metasurface absorber-based biomedical sensor for cancer cell detection applications. The proposed metasurface structure is designed using the metallic split annular ring on GaAs substrate, which offers more than 97% absorption at 3.77 THz with the FWHM absorption bandwidth and Q factor of 110 GHz and 34.27, respectively. The absorption mechanism inside the THEMWA is exploited with the help of a normalized input impedance $(mathrm{Z}_{text{eff}})$ plot and electric and magnetic coupling. Four-fold symmetry inside the resonator makes this structure's polarization insensitive. This study further uses this proposed structure as a sensor where cancer cells are detected by the shift of resonance frequency caused by variations (changes) in the refractive index of biological samples placed on top of the absorbers. The simulation's output demonstrates that the proposed structure's resonance frequency shifts from 3.608 THz to 3.59 THz with a change in refractive index from 1.35 to 1.40. This TEMWA-based sensor offered high sensitivity and FOM of 360 GHz/RIU and 3.273, respectively, which make this proposed structure a good candidate for refractive index-based biomedical sensors for cancer detection applications.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"68 6 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":"130959941","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}

{"title":"Design and Implementation of 100W GaN HEMT Power Amplifier in UHF band","authors":"Parul Gupta, M. Mishra, Sudhir Kumar","doi":"10.23919/URSI-RCRS56822.2022.10118553","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118553","url":null,"abstract":"This paper presents design and implementation of a power amplifier using packaged GaN HEMT (High electron mobility transistor) device and delivering an output power of 100W at 1-dB compression in UHF (400–450 MHz) band. To drive this 100W power amplifier, a driver amplifier delivering 10 W linear output power has also been designed. Both the amplifiers have been designed and integrated in the total chain delivering an output power of 1KW.","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":"130410062","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}

{"title":"Progress Towards the Development of a Portable All-optical Atomic Clock Based on a Two-photon Transition in Warm Atomic Vapor","authors":"S. Jana, B. Sahoo, Aayushman Sharma","doi":"10.23919/URSI-RCRS56822.2022.10118451","DOIUrl":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118451","url":null,"abstract":"Optical clocks represent the hallmark of precise timekeeping. The most precise atomic clocks are laboratory-based ones that utilize transitions in the microwave/optical domain of neutral atoms or trapped ions. These clocks define an international time scales, confirm the consistency of physical constants and stimulate the search for new physics outside the Standard Model. The other area is the regime of portable atomic clocks based on warm atomic vapor, which is small, power-efficient and deployable in the field with a variety of civilian applications, including sensing, communication and navigation. Two-photon resonance and optical transition based field deployable clocks present a viable alternative that may outperform current commercial chip scale clocks by at least a factor of 10 in terms of both long-term and short-term stability. For portable clocks, two-photon transitions in alkaline earth metals are of special interest. One of the systematic inaccuracies in the optical reference is eliminated by using counter-propagating laser beams to create Doppler-free spectroscopy. At IIT Tirupati, we are engaged in developing the next generation of atomic vapor based portable frequency standard using two-photon transition in Rubidium (Rb) for atomic sensing and quantum positioning applications. This article discusses the physics behind the two-photon transition in Rubidium atoms suitable for a clock reference. Briefly, it discusses the experimental methodology for realizing an optical clock using warm rubidium vapor.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"53 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":"115168257","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}