Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 44 for “"Dual polarization"”.
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Dual-polarization meteorological radar: theory and design
… to systems using linear, circular, or elliptical polarization. The general formulation reduces to results previously published in the literature for linear polarization differential reflectivity (Z<sub>DR</sub>) and for circular polarization depolarization ratio ( CDR). Analysis of the linear …
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Dual-Polarization Radar Characteristics of Convection in Hawaii during HERO
… (HERO). The project was one of the first dual-Polarization field experiments to date performed in Hawai`i. Dual-polarization radars send and receive pulses with both horizontal and vertical polarization, allowing them to retrieve hydrometeor Characteristics in two dimensions. With this …
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Compact integrated designs of microwave filters and antennas with dual-polarization
… 3.5 – 3.7 GHz frequency range are presented. A dual-mode waveguide filter is used in both designs, while a microstrip antenna is used for one design and a dielectric resonator antenna (DRA) is used for the other. Microstrip antenna and DRA are used due to their low-profile, ease of fabrication …
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Operational Use of Specific Differential Phase Shift in Dual Polarization Radars
Specific differential phase shift is one of three new base products that have become available to operational weather forecasters since the WSR-88D upgrades were completed in May 2013. Though most often used as a component in quantitative precipitation estimates, this research focused on …
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The dual-polarization radar signature of a wind turbine: characterization and suppression
… clutter, and wind turbines are presented using dual-polarization weather radar observations. Without direct knowledge of a wind turbine's operating state, the physical characteristics of the turbine---specifically, its cyclostationarity---are exploited to implement a temporal suppression method …
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Tests of quantitative precipitation estimates using national weather service dual-polarization radar in Missouri
… of Missouri in 2014. The data from twelve individual rain gauge sites, which are considered to provide the "ground truth" rainfall quantities (Kitchen and Blackall, 1992), are measured against the estimated rainfall calculated by the three National Weather Service radars. Also included is an …
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The study and real-time implementation of attenuation correction for X-band dual-polarization weather radars
… community. Recently, use of short range dual-polarization X-band radar systems has gained momentum due to lower system cost compared with the much more expensive S-band systems. Advances in dual-polarization radar research have shown that the specific attenuation and differential …
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Cross validation of observations from the GPM dual-frequency precipitation radar and dual-polarization S-band ground radars
… Measurement (GPM) Mission Satellite with dual polarization S-Band Ground Radars. The GPM mission is a joint venture by the NASA and the JAXA. The radar on board the core observatory is a dual-frequency precipitation radar (DPR) capable of simultaneously operating at 13.6 GHz (Ku band) and …
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The development and validation of an X-band dual polarization Doppler weather radar test node for a tropical network
An automated network of three X-band dual polarization Doppler weather radars is in process of being deployed and operational on the western coast of Puerto Rico. Colorado State University and the University of Puerto Rico at Mayaguez have collaborated to install the first polarimetric weather …
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Radar multi-sensor (RAMS) quantitative precipitation estimation (QPE)
… is to present the development of a regional dual polarization QPE process known as the RAdar Multi-Sensor QPE (RAMS QPE). This scheme applies the dual polarization radar rain rate estimation algorithms developed at Colorado State University into an adaptable QPE system. The methodologies used …
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Role of multiscale atmospheric conditions in the evolution of convective organization during MJO-1 of DYNAMO/CINDY/AMIE
Analysis of S-PolKa dual-polarization radar and 6-hourly ERA-interim reanalysis data shows the multiscale atmospheric conditions and changes in convective organization during a central Indian Ocean Madden-Julian Oscillation (MJO) event observed by the DYNAMO/CINDY/AMIE field campaigns in October …
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Optical Studies of Ordered Monomolecular Layers: Ab Initio Simulation and Experiment
… molecules adsorbed on a solid substrate, using dual polarization interferometry (DPI). A new theoretical framework is designed based on the dual polarization interferometer for the detection of anisotropic information and the average anchoring angle of the adsorbed molecules, provided the liquid …
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Forecasting The Onset Of Cloud-ground Lightning Using S-pol And Nldn Data
… 1st August and 30th September, 1998. The S-band dual-polarization radar (S-Pol) belonging to the National Center for Atmospheric Research (NCAR) was part of the surface based facilities during this project, and was located at Melbourne, Florida. This provided an excellent opportunity to observe …
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Microphysical Mechanisms in Stratiform Precipitation as Observed in OLYMPEX
… aircraft microphysical sampling and ground-based dual-polarization radar measurements. On 12 November, the University of North Dakota Citation research aircraft flew through a widespread region of stratiform precipitation in the pre-warm frontal sector of the storm. In general, the precipitating …
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A comparison of X-band polarization parameters with in-situ microphysical measurements in the comma head of two winter cyclones
Since the advent of dual-polarization radar, methods of classifying hydrometeors by type from measured polarization variables have been developed. However, the deterministic approach of existing hydrometeor classification algorithms of assigning only one dominant habit to each volume does not …
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Rain attenuation and depolarization along 10 to 30 GHz earth space links predicted from s-band dual-polarized radar measurements
… is capable of predicting attenuation and cross polarization at 10-30 GHz from dual-polarization radar data with a high degree of accuracy. FORWP uses a rigorous backscattering computer model BSCAT to infer rain drop size distribution along the slant path from radar measured reflectivity and …
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Filtering antennas based on rectangular dielectric resonators
… responses, have been achieved for both linear polarization and dual polarization. All designs have been simulated and optimized using a full wave electromagnetic (EM) simulator, and results are compared and discussed.
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Modal and radiation characteristics of the crossed-septum dielectric loaded waveguide for wideband applications
Broadband, high power, dual polarized phased arrays constructed from waveguide type elements generally require a 90 degree rotationally symmetric waveguide cross sectional geometry that can support single-mode propagation over the desired bandwidth. This dissertation presents a novel method of …
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Performance of dual polarized site diversity satellite communications systems
Dual polarization allows a communication system to transfer twice as much information as a single polarized communication system, with no increase in the required bandwidth. Site diversity may be used in high frequency satellite communication systems to reduce the effects of attenuation and …
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Melt Detection and Estimation in Greenland Using Tandem QuikSCAT and SeaWinds Scatterometers
Ku-band dual-polarization radar backscatter measurements from the SeaWinds on QuikScat (QuikScat) and SeaWinds on ADEOS-2 (SeaWinds) scatterometers are used to classify the melt state and estimate melt severity in Greenland. Backscatter measurements are organized into high temporal and high spatial …
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