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URSI Atlantic Radio Science Conference (URSI AT-RASC)
2018 2nd URSI Atlantic Radio Science Meeting (AT-RASC)
Showing 1-25 of 373
Proceedings
The proceedings of this conference will be available for purchase through Curran Associates.
URSI Atlantic Radio Science Meeting (AT-RASC), 2018 2nd
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High-Frame-Rate Spectrum Measurement for Ultrafast Optical Pulses Based on Optical Signal Processing
Publication Year: 2018,Page(s):1 - 4
The pulse-by-pulse single-shot spectrum measurement for high-repetition rate optical pulses with femtosecond or picosecond pulse width is important for capturing non-repetitive and rare phenomena of substances. Conventional optical spectrum analyzers cannot acquire the spectrum for each pulse at high-repetition rate without missing due to the low processing speed. Several highspeed optical signal ...Show More
1.62GHz Circularly Polarized Pin-Fed Notched Circular Patch Antenna
Emmanouil N. Tziris;Pavlos I. Lazaridis;Keyur K. Mistry;Zaharias D. Zaharis;John P. Cosmas;Bo Liu;Ian A. Glover
Publication Year: 2018,Page(s):1 - 3
Cited by: Papers (1)
This paper studies a circular patch antenna which is fed by using a coaxial pin, which is a suitable antenna design for applications where small size is of importance. Such applications are wearable antenna designs. The main purpose of this paper is to design an antenna with wearable capabilities and adequate radiation characteristics for satellite communications and more specifically for the Irid...Show More
Software Instrumentation of an Unmanned Aerial Vehicle for HPEM Effects Detection
Publication Year: 2018,Page(s):1 - 4
Cited by: Papers (3)
Unmanned aerial vehicles are spreading and their malicious use considered as a plausible threat against critical infrastructures. Their neutralization is of high interest for security aware organizations and high power directed energy weapons have been proposed. Therefore, the analysis of the susceptibility of such devices is of fundamental interest for both offensive and defensive purposes. Many ...Show More
Explaining the Apparent Impenetrable Barrier to Ultra-relativistic Electrons in the Outer Van Allen Belt
Publication Year: 2018,Page(s):1 - 1
The physical processes responsible for this apparent impenetrable barrier have not yet been fully identified. However, recent studies have suggested that fast loss, such as that associated with scattering into the atmosphere from man-made very-low frequency (VLF) transmissions, is required to limit the Earthward extent of the belt. Here we present simulation results of the ultra-relativistic elect...Show More
Antenna Calibration with Improved Accuracy in a Semi-Anechoic Chamber
Publication Year: 2018,Page(s):1 - 3
Cited by: Papers (1)
A method to improve the quality of antenna calibration in a semi-anechoic chamber is discussed, which is based on a compensation of unwanted reflections at chamber walls with the help of destructive interference. To this end, several measurements are carried out and averaged in a favorable way. This method significantly increases the accuracy of antenna calibration when employed in connection with...Show More
National Institute of Information and Communications Technology (NICT) has a long history to provide space weather (SWx) information service operationally since 1988 as an original member of ISES (International Space Environment Service). The importance of space weather information increases with development of Information and Communication Technology. The International Civil Aviation Organization...Show More
Observations of Whistler Waves in the Magnetic Reconnection Diffusion Region
S. Y. Huang;Z. G. Yuan;H. S. Fu;A. Vaivads;F. Sahraoui;Y. V. Khotyaintsev;A. Retino;M. Zhou;D. Graham;K. Fujimoto;X. H. Deng;B.B. Ni;Y. Pang;S. Fu;D. D. Wang
Publication Year: 2018,Page(s):1 - 4
Cited by: Papers (1)
Whist/er waves are believed to play an important role during magnetic reconnection. In this paper, we report the simultaneous occurrence of two types of the whistler waves in the magnetotail reconnection diffusion region. The first type is observed in the pileup region of downstream and propagates away along the field lines to downstream, and is possibly generated by the electron temperature aniso...Show More
Measurement of the SAR Value Distribution in an Electromagnetic Reverberation Chamber
Publication Year: 2018,Page(s):1 - 1
Exposing biological tissue to electromagnetic (EM) fields may result in many effects; yet the only reproducible effect known in the RF range is the thermal one related to heating of the tissue [1]. It is quantified by the specific absorption rate (SAR). Differing thermal and non-thermal effects requires suitable tissue samples under well-defined environmental parameters (e.g. temperature and humid...Show More
Detection of UHF RFID Tags in Metallic Guided Structures
Publication Year: 2018,Page(s):1 - 3
Cited by: Papers (4)
Since at least one decade GB-SAR (Ground Based Synthetic Aperture Radar) has been used for monitoring slopes and large structures. ArcSAR is a particular implementation of GBSAR, which has been receiving increasing interest in the last years. The great advantage of ArcSAR is its capability to synthesize images at 360° with constant resolution in azimuth. Nevertheless ArcSAR has a critical limitati...Show More
High-Latitude Ionospheric Scintillations During Geomagnetic Disturbances
Publication Year: 2018,Page(s):1 - 1
The Earth's plasmasphere is the vast `doughnut' shaped dense plasma region of the magnetosphere that is filled with cold ions and electrons of ionospheric origin. The plasmaspheric plasma density shows an abrupt drop by a factor of 5 or more around 4 - 6 Re (Re: Earth's radius). The boundary has been called `plasmapause'. Since the plasmaspheric cold plasma controls generation of plasma waves, the...Show More
Integrated Simulation Environments for Vehicular Communications in Cooperative Road Transportation Systems
Sandro Chiocchio;Arianna Persia;Francesco Valentini;Elena Cinque;Marco Pratesi;Fortunato Santucci
Publication Year: 2018,Page(s):1 - 4
Cited by: Papers (4)
Pervasive digital technologies and wireless communications are the key enablers for the “smart” evolution of transportation systems, where the current development trend is oriented to increase the level of safety and comfort in driving and traveling, to reduce CO2 emissions and to finally support assisted and autonomous driving. With particular reference to vehicular traffic, the accurate localiza...Show More
Near-Field MIMO System Assessment
Michael Haider;Pablo Corrales;Damienne Bajon;Sidina Wane;Johannes A. Russer
Publication Year: 2018,Page(s):1 - 3
E2018URSIRomero. In particular, periodic signals such as trains of optical pulses and their spectral counterpart, optical frequency combs, are extremely relevant examples of waveforms with deep implications in a myriad of areas of science and technology, where the period of repetition plays a fundamental role in their areas of application. Here, we present a set of lossless linear techniques based...Show More
UAPO Solution for the Plane Wave Diffraction by a 90° Coated Wedge
Publication Year: 2018,Page(s):1 - 4
Cited by: Papers (2)
This paper provides an alternative solution to the diffraction problem associated to a plane wave incident on a perfectly conducting wedge coated by dielectric layers. The skew incidence with respect to the edge of a right-angled structure is considered. The proposed analytical approach starts by considering the scattering integral and using a physical optics approximation of the electric and magn...Show More
Diffusion Modeling of Electrons in the Inner Zone and Slot Region
Publication Year: 2018,Page(s):1 - 1
Wave-particle interactions have long been considered central to the behaviour of energetic electrons in the inner radiation belt and slot region. Plasmaspheric hiss constitutes one of the main components of the waves, but lightning and VLF ground transmitters also make important contributions to the wave population. Benchmark models for each of these types of waves, pre-VAP but post-CRRES, were gi...Show More
OIASA Oblique Ionograms Automatic Scaling Algorithm Application to the Ionograms Recorded by EBRO Observatory Ionosonde
Publication Year: 2018,Page(s):1 - 1
The INGV oblique ionograms automatic scaling algorithm (OIASA), for the identification of trace of oblique ionograms, has been applied to ionograms from a campaign of oblique soundings between Dourbes (50.1°N, 4.6°E) and Roquetes (40.8°N, 0.5°E), in order to determine the maximum usable frequency (MUF) for the considered radio link, automatically rejecting poor quality ionograms. Oblique soundings...Show More
A New Method to Retrieve Thermospheric Parameters from Daytime Ne(h) Observations in the F1-Region
Publication Year: 2018,Page(s):1 - 1
A new method to retrieve Tex, [O],[O2 as well as the total solar EUV flux with λ>1050A from daytime Ne(h) profiles at F1-region heights (160-190) km has been proposed. Unlike the previous version of the method based on foF1 observations and confined by summer months the new one can be used for all seasons of the year. The method was tested with winter CHAMP/STAR neutral gas density observations an...Show More
Ionosonde Data Analysis in Relation with the Occurrence of the 24 August 2016 M6 Amatrice Earthquake
Publication Year: 2018,Page(s):1 - 1
A study on the ionosonde data in the period of few months preceding the crustal M6 earthquake occurred on 24 August 2016, in central Italy, near Amtrice village is here presented. The earlier obtained relationships for ionospheric anomalies related to strong Japanese earthquakes are considered in this work, to check their validation for the Italian moderate earthquakes. The considered ionospheric ...Show More
Extracting the Global Cosmological 21-cm Signal From EDGES Data Using MCMC
Raul A. Monsalve;Judd D. Bowman;Alan E.E. Rogers;Thomas J. Mozdzen;Nivedita Mahesh
Publication Year: 2018,Page(s):1 - 1
The 21-cm spectral line emitted by neutral hydrogen in the intergalactic medium (IGM) at redshifts > 6, can be used to characterize the first generations of stars, galaxies, and black holes in the Universe. Due to redshift, the 21-cm signal is expected at frequencies 6. The Experiment to Detect the Global EoR Signature (EDGES) measures the sky-average, or global, brightness tempe...Show More
Summer Noontime hmF2 Long-Term Trends Inferred from foF1 and foF2 Ionosonde Observations in Europe
Publication Year: 2018,Page(s):1 - 1
Long-term hmF2 trends may serve as an indicator of the thermosphere cooling due to the CO2 concentration increase in the Earth's atmosphere. Unfortunately required long-term reliable hmF2 observations are absent. A new method has been proposed to solve this problem using available monthly median foF1 and foF2 ground-based ionosonde observations. Such manually scaled observations are available on E...Show More
Long-term Trends in Thermospheric and Ionospheric Parameters as the Reflection of Solar Activity Long-Term Variations
Publication Year: 2018,Page(s):1 - 1
The Earth's upper atmosphere is under the total control of solar activity as the Earth is in the atmosphere of the Sun. Using retrieved thermospheric parameters from observed foF1 long-term variations in Tex and neutral composition have been revealed for the period of 5 solar cycles. The residual trends in Tex and $\rho$ are small (<1% per decade) and statistically insignificant. Large and physica...Show More
Architecture of Highly Integrated Cryogenic Active Planar OrthoMode Transducer for the 3-mm Band
Publication Year: 2018,Page(s):1 - 4
Cited by: Papers (6)
We describe the design concepts of two highly integrated cryogenic receiver modules based on “active” planar Ortomode Transducers (OMTs) for dual-polarization radio astronomy of observation across 75-116 GHz (3-mm band). Both OMTs share common features and comprise active parts with MMIC (Monolithic Microwave Integrated Circuit) Low Noise Amplifier (LNA) chips, each with ≈20 dB gain, and DC power ...Show More
NEFOCAST Project for Real-Time Precipitation Estimation from Ku Satellite Links: Preliminary Results of the Validation Field Campaign
E. Adirosi;A. Antonini;G. Bacci;F. Caparrini;L. Facheris;F. Giannetti;A. Mazza;M. Moretti;A. Petrolino;R. Reggiannini;A. Vaccaro;L. Baldini
Publication Year: 2018,Page(s):1 - 4
Cited by: Papers (2)
NEFOCAST is a project funded by the Tuscany Region Goverment (Italy) that aims at setting up, and demonstrating through field experiments, the concept of a system able to provide precipitation maps in real-time based on the attenuation measurements collected by a dense population of interactive satellite terminals (called SmartLNB, smart Low-Noise Block converter) commercially used as bidirectiona...Show More
Comaparison of Disdrometer Performance During GPM-GV IFloodS Field Campaign
Publication Year: 2018,Page(s):1 - 1
Nowadays, disdrometers of different type (i.e. optical, impact, video, laser and Doppler) are widely used worldwide to estimate rain drop size distribution (DSD) and rainfall rate. In the last few years they become more reliable, easy to operate with regular maintenance, and economically affordable, however disdrometers are still considered as a research tool and national weather services around t...Show More
Use of a Statistical Measurement Based Propagation Model for Small Cells to Evaluate Global Exposure
Amirreza Chobineh;Yuanyuan Huang;Taghrid Mazloum;Emmanuelle Conil;Joe Wiart
Publication Year: 2018,Page(s):1 - 3
Nowadays wireless technologis play an important role in people's everyday life. As data traffic grows significantly, operators aim to improve the performance of their network in order to respond to the growing demand. Small cells seem to be a promising technique to achieve this goal. Meanwhile, along with the expansion in terms of mobile technologies, public concerns about exposure induced by radi...Show More
Proceedings
The proceedings of this conference will be available for purchase through Curran Associates.
URSI Atlantic Radio Science Meeting (AT-RASC), 2018 2nd
- Print on DemandPurchase at Partner
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