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.
Results
Showing 1 to 20 of 44 for “"brightness temperature"”.
-
Seawinds Radiometer Brightness Temperature Calibration And Validation
… and measure the ocean microwave emissions (brightness temperature, Tb) simultaneously with the backscattered power. When SeaWinds on ADEOS was launched, this same algorithm was applied, but the results were anomalous. The initial SRad brightness temperatures exhibited significant, …
-
A Roughness Correction for Aquarius Ocean Brightness Temperature Using the CONAE MicroWave Radiometer
… using an L-band radiometer that measures ocean brightness temperature (Tb). The application of L-band radiometry to retrieve SSS is a difficult task, and therefore, precise Tb corrections are necessary to obtain accurate measurements. One of the major error sources is the effect of ocean …
-
Study on the Intensity and Track Prediction of Typhoon Yagi (2024) Based on Ensemble Kalman Filter Assimilation of Satellite and Radar Data
… TCVitals data, Himawari-9 satellite radiance and brightness temperature data, and radar data. The study shows that, in the analysis fields, satellite brightness temperature assimilation can significantly improve the model representation of typhoon clouds and convective structures. Compared with …
-
Evaluation Of A Microwave Radiative Transfer Model For Calculating Sat
… developed to calculate the observed radiance (brightness temperature) seen by the remote sensor. The RTM calculated brightness temperature is a function of fourteen environmental parameters, including atmospheric profiles of temperature, pressure and moisture, sea surface temperature, and cloud …
-
An Improved Microwave Radiative Transfer Model For Ocean Emissivity At Hurricane Force Surface Wind Speed
… in hurricanes from remotely sensed radiometric brightness temperature. The model development is based on measurements obtained with the Stepped Frequency Microwave Radiometer (SFMR), which routinely flys on the National Oceanic and Atmospheric Administration's hurricane hunter aircraft. This …
-
Developing A Global, Multi-decadal (1983-2017) Convection Tracking Database Utilizing ISCCP HXG Data
… segmentation, and linking algorithms to infrared brightness temperature fields, convective systems are systematically identified and tracked through their life cycles. The resulting database provides a rich set of structural, dynamical, and radiative properties for over 67 million convective …
-
Analyis Of Airborne Microwave Polarimetric Radiometer Measurements In The Presence Of Dynamic Platform Attitude Errors
… signature, it is important that all systematic brightness temperature (Tb) errors be eliminated, especially those that vary with the radiometer antenna scan position (look direction). This can be accomplished either in hardware implementation or through data processing corrections. …
-
Probabilistic methods for radio interferometry data analysis
… estimates of this model, we also derive the brightness temperature of the blazar (10¹¹-10¹² K), which confirms the presence of a relativistically boosted jet with an intrinsic brightness temperature lower than the apparent brightness temperature, consistent with the literature. We also …
-
An Ocean Surface Wind Vector Model Function For A Spaceborne Microwave Radiometer And Its Application
… AMSR observes the vertical and horizontal brightness temperature (TB) at six frequency bands between 6.9 GHz and 89.0 GHz. Although these measurements contain some wind direction information, the overlying atmospheric influence can easily obscure this signal and make wind direction …
-
Evaluating approaches to detecting ice accretion in and around turbofan jet engines.
… measures power that can be expressed as brightness temperature. Due to material properties, ice emits a significantly higher amount of energy and appears "brighter" to a microwave radiometer compared to liquid water. Interferometers, on the other hand, make highly sensitive measurements …
-
Hurricane Wind Speed And Rain Rate Retrieval Algorithm For The Stepped Frequency Microwave Radiometer
… HIRA is designed to process airborne microwave brightness temperatures from the NOAA, Stepped Frequency Microwave Radiometer (SFMR), which routinely collects data during NOAA hurricane hunter aircraft flights. SFMR measures wind speeds and rain rates at nadir only, but HIRA will soon be …
-
Convective structure and its evolution in tropical cyclones as observed by passive microwave sensors in relation to intensity change
… using 85 GHz and 37 GHz polarization corrected temperatures as well as microwave rain rate estimates. These products are examined as a function of azimuth and annuli in true-north, storm-relative motion, and shear-relative coordinates and evaluated in terms of intensity (wind speed) and …
-
An On-orbit Calibration Procedure for Spaceborne Microwave Radiometers Using Special Spacecraft Attitude Maneuvers
… processing (Archive/Legacy of the NASA TMI 1B11 brightness temperature data product). This is of importance since TMI's 17-year sensor data record must be vetted of all known calibration errors so to provide the final stable data for science users, specifically, climatological data records.
-
Microwave Remote Sensing of the Greenland Ice Sheet: Models and Applications
… in the diurnal variation of the different brightness temperature channel ratios. The polarization ratio increases during periods of surface melt while the frequency ratio remains relatively constant. The frequency ratio increases during periods of expected subsurface melt. Similar trends …
-
It's always darkest before the cosmic dawn : early results from novel tools and telescopes for 21 cm cosmology
… scale and use it to understand the density, temperature, and ionization evolution of the intergalactic medium over this dramatic period in the history of the universe. For my Ph.D. thesis, I explore a number of advancements toward detecting and characterizing the 21 cm signal from the Cosmic …
-
Potential for tsunami detection and early-warning using space-based passive microwave radiometry
… detect oceanic parameters such as sea-surface temperature and sea surface roughness to contribute to earlier tsunami detection, when the tsunami is farther from shore, which will increase the reaction time for at-risk coastal communities. This thesis will outline a physics based approach to …
-
Retrieval of cloud-cleared atmospheric temperature profiles from hyperspectral infrared and microwave observations
… thesis addresses the problem of retrieving the temperature profile of the Earth's atmosphere from overhead infrared and microwave observations of spectral radiance in cloudy conditions. The contributions of the thesis are twofold: improvements in 1) microwave instrumentation and 2) hyperspectral …
-
Global estimation of precipitation using opaque microwave bands
… channels, spatial filtering for cloud-clearing brightness temperature images, and data fusion for sharpening images in order to optimize sensing of small precipitation cells. An effort has been made to make the algorithm as blind to surface variations as possible. The algorithm was trained using …
-
Solar eclipse observation on may 21, 2012 from JVLA
… At the selected frequency of 2.56 GHz, the peak brightness temperature corresponding to both the active regions observed show 90% increase over the quiet Sun region value. Even though the bright source like feature in the synthesis map does not show much variations in its size, it shows intensity …
-
Evaluating the Use of TROPICS Pathfinder Observations for Lunar Calibration
… lunar observations, estimates lunar intrusion temperature and scan geometry, and accounts for pointing error. We compare the lunar brightness temperature estimates and measured antenna temperatures to the lunar radiative transfer model developed by Yang and Burgdorf [21]. We test our lunar …
Page 1 of 3