Search Results - "Frasier, Stephen J."

Weather Observation by an Electronically Scanned Dual-Polarization Phase-Tilt Radar by Orzel, Krzysztof A., Frasier, Stephen J.

“…A dual-polarized X-band solid-state 1-D electronic scanning "phase-tilt" weather radar (PTWR) and its scanning geometry are presented. In this architecture,…”
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On the Projection of Polarimetric Variables Observed by a Planar Phased-Array Radar at X-Band by Heberling, William, Frasier, Stephen J.

“…We present the characteristics of dual-polarized weather radar variables as observed by a planar phased-array radar (PPAR) operating at X-band. The…”
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Predistortion for Very Low Pulse-Compression Sidelobes in Solid-State Meteorological Radar by Frasier, Stephen J., Argenti, Fabrizio, Facheris, Luca

“…In this paper, we address the problem of combating the effect of the nonlinearities of the transmit-receive chain in solid-state radars, which are typically…”
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Evolution of ocean slicks under a rising wind by Marmorino, George O., Smith, Geoffrey B., Toporkov, Jakov V., Sletten, Mark A., Perkovic, Dragana, Frasier, Stephen J.

“…Airborne synthetic aperture radar and high‐resolution infrared imagery are used to examine the evolution of natural ocean slicks during a period of freshening…”
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Airborne Co-polarization and Cross-Polarization Observations of the Ocean-Surface NRCS at C-Band by Sapp, Joseph W., Alsweiss, Suleiman O., Jelenak, Zorana, Chang, Paul S., Frasier, Stephen J., Carswell, James

“…Airborne co-polarization and cross-polarization observations of ocean surface normalized radar cross section (NRCS) were conducted over the North Atlantic…”
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Comparison of the Sentinel-1B Synthetic Aperture Radar With Airborne Microwave Sensors in an Extra-Tropical Cyclone by Sapp, Joseph W., Mouche, Alexis A., Jelenak, Zorana, Chang, Paul S., Frasier, Stephen J.

“…In Winter 2017, the University of Massachusetts Amherst's Imaging Wind and Rain Airborne Profiler (IWRAP) was flown on a National Oceanic and Atmospheric…”
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Microwave radar cross sections and Doppler velocities measured in the surf zone by Farquharson, Gordon, Frasier, Stephen J., Raubenheimer, Britt, Elgar, Steve

“…The relationship between microwave imaging radar measurements of fluid velocities in the surf zone and shoaling, breaking, and broken waves is studied with…”
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A New Fuzzy Logic Hydrometeor Classification Scheme Applied to the French X-, C-, and S-Band Polarimetric Radars by Al-Sakka, Hassan, Boumahmoud, Abdel-Amin, Fradon, Béatrice, Frasier, Stephen J., Tabary, Pierre

“…A new fuzzy logic hydrometeor classification algorithm is proposed that takes into account data-based membership functions, measurement conditions, and…”
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Ceilometer-Based Rain-Rate Estimation: A Case-Study Comparison With S-Band Radar and Disdrometer Retrievals in the Context of VORTEX-SE by Rocadenbosch, Francesc, Barragan, Ruben, Frasier, Stephen J., Waldinger, Joseph, Turner, David D., Tanamachi, Robin L., Dawson, Daniel T.

“…Attenuated backscatter measurements from a Vaisala CL31 ceilometer and a modified form of the well-known slope method are used to derive the ceilometer…”
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Comparison of optical and radar measurements of surf and swash zone velocity fields by Puleo, Jack A., Farquharson, Gordon, Frasier, Stephen J., Holland, K. Todd

“…Surf zone bore celerities and swash zone surface currents were measured on a shallow sloping, low‐energy beach using two remote sensing methods that differ…”
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Contrast-Based Phase Calibration for Remote Sensing Systems With Digital Beamforming Antennas by Farquharson, G., Lopez-Dekker, P., Frasier, S. J.

“…A contrast-based phase calibration algorithm for digital beamforming remote sensing radars using three contrast metrics is presented. The algorithm corrects…”
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Pulse pair beamforming and the effects of reflectivity field variations on imaging radars by Cheong, Boon Leng, Hoffman, Michael W., Palmer, Robert D., Frasier, Stephen J., López-Dekker, F. J.

“…Coherent radar imaging (CRI), which is fundamentally a beamforming process, has been used to create images of microscale, reflectivity structures within the…”
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Dual-beam interferometry for ocean surface current vector mapping by Frasier, S.J., Camps, A.J.

“…The recent use of along-track interferometry (ATI) in synthetic aperture radar (SAR) has shown promise for synoptic measurement of ocean surface currents…”
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Airborne Dual-Polarization Observations of the Sea Surface NRCS at C-Band in High Winds by Sapp, J. W., Frasier, S. J., Dvorsky, J., Chang, P. S., Jelenak, Z.

“…Airborne dual-polarization observations of sea surface normalized radar cross section (NRCS) were conducted over the North Atlantic during January-February…”
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Sea surface velocity vector retrieval using dual-beam interferometry: first demonstration by Toporkov, J.V., Perkovic, D., Farquharson, G., Sletten, M.A., Frasier, S.J.

“…The dual-beam interferometer consists of two interferometric synthetic aperture radars (InSARs), one squinted at 20/spl deg/ forward of broadside, and the…”
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RADAR IN ATMOSPHERIC SCIENCES AND RELATED RESEARCH: Current Systems, Emerging Technology, and Future Needs by Bluestein, Howard B., Rauber, Robert M., Burgess, Donald W., Albrecht, Bruce, Ellis, Scott M., Richardson, Yvette P., Jorgensen, David P., Frasier, Stephen J., Chilson, Phillip, Palmer, Robert D., Yuter, Sandra E., Lee, Wen-Chau, Dowell, David C., Smith, Paul L., Markowski, Paul M., Friedrich, Katja, Weckwerth, Tammy M.

“…To assist the National Science Foundation in meeting the needs of the community of scientists by providing them with the instrumentation and platforms…”
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Longshore Surface Currents Measured by Doppler Radar and Video PIV Techniques by Perkovic, D., Lippmann, T.C., Frasier, S.J.

“…Mean longshore surface currents within the surf zone were measured using two remote sensing techniques: microwave Doppler radar and optical video. Doppler…”
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Surface Velocity Profiles in a Vessel's Turbulent Wake Observed by a Dual-Beam Along-Track Interferometric SAR by Toporkov, J. V., Hwang, P. A., Sletten, M. A., Farquharson, G., Perkovic, D., Frasier, S. J.

“…The dual-beam interferometer is an airborne instrument that combines two vertically polarized C-band along-track interferometric synthetic aperture radars…”
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IWRAP: the Imaging Wind and Rain Airborne Profiler for remote sensing of the ocean and the atmospheric boundary layer within tropical cyclones by Fernandez, D.E., Kerr, E.M., Castells, A., Carswell, J.R., Frasier, S.J., Chang, P.S., Black, P.G., Marks, F.D.

“…The Imaging Wind and Rain Airborne Profiler (IWRAP) is the first high-resolution dual-band airborne Doppler radar designed to study the inner core of tropical…”
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Evaluation of phased-array weather-radar polarimetry at X-band by Heberling, William, Frasier, Stephen J.

“…The University of Massachusetts is implementing a testbed to evaluate phased-array weather radar polarimetry at X-band. The project seeks to determine the…”
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