A5046397043- Precipitation Measurement and Analysis
- Meteorological Phenomena and Simulations
- Soil Moisture and Remote Sensing
- Atmospheric aerosols and clouds
- Ocean Waves and Remote Sensing
- Planetary Science and Exploration
- Geophysics and Gravity Measurements
- Astro and Planetary Science
- Tropical and Extratropical Cyclones Research
- Structural Analysis and Optimization
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Spacecraft Design and Technology
- Radio Wave Propagation Studies
- Spacecraft and Cryogenic Technologies
- Aerospace Engineering and Energy Systems
- Aeolian processes and effects
- Climate variability and models
- Antenna Design and Analysis
- Satellite Communication Systems
- Cryospheric studies and observations
- Advanced Materials and Mechanics
- Advanced Antenna and Metasurface Technologies
- Geology and Paleoclimatology Research
- Climate change and permafrost
- Dielectric materials and actuators
Asan Medical Center
2007-2025
Severance Hospital
2024
Jet Propulsion Laboratory
2006-2021
California Institute of Technology
1996-2015
Qilu Hospital of Shandong University
2007
Nanjing University
2007
University of Ulsan
2007
CARE Hospitals
2007
Health Sciences Centre
2007
Radar (United States)
2002-2004
The Tropical Rainfall Measuring Mission (TRMM) satellite was launched on 27 November 1997, and data from all the instruments first became available approximately 30 days after launch. Since then, much progress has been made in calibration of sensors, improvement rainfall algorithms, applications these results to areas such as assimilation model initialization. TRMM Microwave Imager (TMI) corrected verified account for a small source radiation leaking into TMI receiver. precipitation radar...
This paper reports on the early mission performance of radar and other major aspects CloudSat mission. The Cloudsat cloud profiling (CPR) has been operating since 2 June 2006 proven to be remarkably stable turn‐on. A number products have developed using these space‐borne data as principal inputs. Combined with A‐Train sensor data, new observations offer unique, global views vertical structure clouds precipitation jointly. Approximately 11% detected over oceans produce that, in all...
The Cloud Profiling Radar, the sole science instrument of CloudSat Mission, is a 94-GHz nadir-looking radar that measures power backscattered by hydrometeors (clouds and precipitation) as function distance from radar. This has been acquiring global time series vertical cloud structures since June 2, 2006. In this paper, an overview performance status, to date, provided together with description basic data products surface clutter rejection algorithm introduced for Release 04 product release.
A spectral difference method is used to quantify the magnitude and extent of radio-frequency interference (RFI) observed over United States in Aqua AMSR-E radiometer channels. survey using data from instrument launched May 2002 shows be widespread C-band (6.9 GHz) The RFI located mostly, but not always, near large highly populated urban areas. locations are persistent time, magnitudes show temporal directional variability. Strong moderate can identified relatively easily an index derived...
Space-based radar observations have transformed our understanding of Earth over the last several decades. Driven by increasingly complex science questions, space missions grown ever more sophisticated with costs rising often to hundreds millions dollars. At other end cost and complexity spectrum, CubeSats emerged in recent years as a disruptive innovation satellite sector are now considered means address targeted questions rapid affordable manner. enable new kinds constellation-based not...
The Soil Moisture Active/Passive (SMAP) mission will deliver global views of soil moisture content and its freeze/thaw state that are critical terrestrial water cycle variables. Polarized measurements obtained with a shared antenna L-band radar radiometer system allow accurate estimation at hydrometeorological scale (10 km) hydroclimatological (40 resolutions. sensors share feed deployable light-weight mesh reflector make conical scans the Earth surface constant look angle. wide-swath (1000...
This paper revisits the problem of finding a parametric form for rain drop size distribution (DSD) which (1) is an appropriate model tropical rainfall, and (2) involves statistically independent parameters. Using TOGA/COARE data, authors derive parametrization meets these criteria. new improvement on one that was derived by Z. S. Haddad et al. (1996) using TRMM ground truth data from Darwin, Australia. The COARE allows to verify spatial variability two "shape" parameters relatively small,...
The Cloud Profiling Radar (CPR) for the upcoming CloudSat Mission is a spaceborne 94-GHz nadir-looking radar that measures power backscattered by clouds as function of distance from radar. This sensor expected to provide cloud measurements at 500-m vertical resolution and 1.5 km horizontal resolution. CPR will operate in short-pulse mode yield minimum detectable sensitivity -28 dBZ.
A new airborne rain-mapping radar (ARMAR) has been developed by NASA and the Jet Propulsion Laboratory for operation on Ames DC-8 aircraft. The operates at 13.8 GHz, frequency to be used Tropical Rainfall Measuring Mission (TRMM). ARMAR simulates TRMM geometry looking downward scanning its antenna in cross-track direction. This basic compatibility between allows provide information useful design, rain retrieval algorithm development, postlaunch calibration. additional capabilities, including...
Numerical climate and weather models depend on measurements from space-borne satellites to complete model validation improvements. Precipitation profiling capabilities are currently limited a few instruments deployed in Low Earth Orbit (LEO), which cannot provide the temporal resolution necessary observe evolution of short time-scale phenomena improve numerical prediction models. A constellation precipitation LEO would this essential capability, but cost timeframe typical satellite platforms...
Information on the global distribution of vertical velocity precipitating particles is needed in estimating latent heat fluxes, and therefore general study energy transportation phenomena atmosphere. Such information not currently available, but it can potentially be obtained by a spaceborne Doppler precipitation radar. In this paper, expected performance for type radar measuring rainfall investigated. Although high relative speed instrument with respect to droplets contributes significantly...
This paper addresses the problem of finding a parametric form for raindrop size distribution (DSD) that 1) is an appropriate model tropical rainfall, and 2) involves statistically independent parameters. Such parameterization derived in this paper. One resulting three "canonical" parameters turns out to vary relatively little, thus making particularly useful remote sensing applications. In fact, new set Γ drop-size-distribution-based Z-R k-R relations obtained. Only slightly more complex...
The dual-frequency Airborne Precipitation Radar-2 (APR-2) was deployed during the Wakasa Bay Experiment in 2003, for validation of Advanced Microwave Scanning Radiometer-EOS. Besides providing extensive observations diverse precipitating systems, this Ku-(13.4 GHz) and Ka-band (35.6 cross-track scanning radar measured sea surface backscatter simultaneously. While characteristics normalized cross section sigma <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
As part of the overall NASA earth science technology research effort, a half-size prototype model light-weight, dual-frequency and wide-swath scanning antenna for next generation spaceborne precipitation radar has recently been developed. It operates channels at both 13.6 35 GHz improved rainfall retrieval accuracy. The proposed is an offset parabolic cylindrical reflector fed by two linear arrays. This design adopted, instead double-curved reflector, because it provides required wide scan...
A novel mission concept, namely NEXRAD in Space, has been developed for detailed monitoring of hurricanes, cyclones, and severe storms from a geostationary orbit. This concept requires space deployable 35-m diameter reflector that operates at 35GHz with surface figure accuracy requirement 0.21 mm RMS. is well beyond the current state-of-the-art. To implement this several potential technologies associated large, lightweight, spaceborne reflectors have investigated by study. These include mesh...
Spaceborne scatterometery has been used for many years now to retrieve the ocean surface wind field from normalized radar cross-section measurements of surface. Though designed specifically measurement precipitation profiles in atmosphere, Precipitation Radar (PR) Tropical Rainfall Measuring Mission (TRMM) also acquires backscattering global oceans. As such, this instrument provides an interesting opportunity explore benefits and pitfalls alternative configurations satellite remote sensing...
The Cassini Titan Radar Mapper is a multimode radar instrument designed to probe the optically inaccessible surface of Titan, Saturn's largest moon. be included in payload Saturn Mission, scheduled for launch 1995. individual modes will allow topographic mapping and imaging at few hundred meters resolution. requirements that lay behind design are briefly discussed, configuration capability described. present limited knowledge Titan's measurement imposed on addressed. Also discussed mission...
Extremely large, lightweight, in-space deployable active and passive microwave antennas are demanded by future space missions. This paper investigates the development of PVDF based piezopolymer actuators for controlling surface accuracy a membrane reflector. Uniaxially stretched films were poled using an electrodeless method which yielded high quality piezofilms required this applications. To further improve piezoperformance piezopolymers, several copolymers examined. It was found that one...
Two decades of spaceborne cloud and precipitation radar data provided by the TRMM's Precipitation Radar (PR) [1], CloudSat's Cloud Profiling (CPR) [2,3] GPM's Dual-frequency (DPR) [4] have enabled unprecedented advancements in global mapping occurrence vertical structure most types meteorological events. After immense success these radars, two new atmospheric EarthCARE [5], a CubeSat (RainCube) [6] been developed will be launched upcoming years, several concepts are being considered for...
The cloud profiling radar (CPR) for the upcoming CloudSat mission is a spaceborne 94-GHz nadir-looking that measures power backscattered by clouds as function of distance from radar. This sensor expected to provide measurements at 500-m vertical resolution and 1.5-km horizontal resolution. CPR operates in short-pulse mode yields minimum detectable sensitivity of-28 dBZ.
RainCube (Radar in a CubeSat) is technology demonstration mission to enable Ka-band precipitation radar technologies on low-cost, quick-turnaround platform. The manifested for an ISS deployment with the ELaNa-23 launch, currently scheduled May, 2018. Radar instruments have often been regarded as unsuitable small satellite platforms due their traditionally large size, weight, and power. Jet Propulsion Laboratory (JPL) has developed novel architecture compatible 6U class. will validate two key...
Pulse compression allows a substantial reduction in the peak transmitted power of radar and is attractive for spaceborne remote sensing applications. In case downward looking rain measuring radar, however, range sidelobes associated with surface return can mask from must be kept to minimum. The authors describe pulse system NASA/JPL Airborne Rain Mapping Radar. This uses time-domain weighting able achieve sidelobe level -55 dB or better flight tests. significantly lower than other values...