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 28 for “"Microwave Radiometer"”.
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Measuring ice accretion with a microwave radiometer.
… before power loss occurs is needed. A passive microwave sensor has been developed to address this problem. The ice accretion sensor has been developed to address this problem. The ice accretion sensor is a microwave radiometer which receives the natural thermal emissions of an environment. Ice …
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A spaceborne microwave radiometer design for ocean wind remote sensing
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Design and development of an airborne microwave radiometer for atmospheric sensing
Satellite-based passive microwave remote sensing is a valuable tool for global weather monitoring and prediction. This thesis presents the design and development of a low-cost airborne weather sensing instrument to independently validate a satellite-based sensor platform. The NPOESS Aircraft …
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Using a co-located GNSS radio occultation payload for microwave radiometer calibration
… of calibrating an orbital cross-track scanning microwave radiometer using a co-located radio occultation (RO) instrument with Global Navigation Satellite Systems (GNSS). The radiometer and RO receiver periodically observe the same volume of atmosphere near the earth's limb, allowing for …
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A Roughness Correction for Aquarius Ocean Brightness Temperature Using the CONAE MicroWave Radiometer
… sea surface salinity (SSS), 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 …
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Hurricane Wind Speed And Rain Rate Retrieval Algorithm For The Stepped Frequency Microwave Radiometer
… The 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 …
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Hydrologic data assimilation of multi-resolution microwave radiometer and radar measurements using ensemble smoothing
… related fluxes by merging noisy low frequency microwave observations with forecasts from a conventional though uncertain land surface model (LSM). Here it is argued that soil moisture estimation is a reanalysis-type problem and thus smoothingis more appropriate than filtering. An ensemble …
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An Ocean Surface Wind Vector Model Function For A Spaceborne Microwave Radiometer And Its Application
… wind speeds have been obtained from passive microwave radiometers. Also, vector ocean surface wind data were primarily obtained from several scatterometry missions that have flown since the early 1990's. However, other than SeaSat-A in 1978, there has not been combined active and passive wind …
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Developing mission operations tools and procedures for the Microwave Radiometer Technology Acceleration (MiRaTA) CubeSat Mission
… observing CubeSat mission, the Micro-sized Microwave Atmospheric Satellite-1 (MicroMAS-1), used a manual approach to both testing and commanding. This approach did not work well when it came to mission operations, as it was error-prone, stressful, and non-repeatable. In this thesis work, we …
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Development and use of an antanna gain pattern test-system for the NAST-M microwave radiometer at [about] 54Ghz
Thesis (M.Eng. and S.B.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Microwave Radiometer (MWR) Evaluation of Multi-Beam Satellite Antenna Boresight Pointing Using Land-Water Crossings, for the Aquarius/SAC-D Mission
This research concerns the CONAE Microwave Radiometer (MWR), on board the Aquarius/SAC-D platform. MWR's main purpose is to provide measurements that are simultaneous and spatially collocated with those of NASA's Aquarius radiometer/scatterometer. For this reason, knowledge of the MWR antenna beam …
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Evaluating approaches to detecting ice accretion in and around turbofan jet engines.
… hence the need for a new sensing technique. A microwave radiometer and two different types of interferometer sensors are being developed to address this issue. A microwave radiometer measures power that can be expressed as brightness temperature. Due to material properties, ice emits a …
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Factors Governing Cloud Growth and Entrainment Rates in Shallow Cumulus and Cumulus Congestus During GoAmazon 2014/2015
… (RWP) observations. A combination of radiosonde, microwave radiometer profiler (MWRP) and microwave radiometer (MWR) observations provide a new and improved best-estimate of the environmental thermodynamic state. We quantify uncertainty in entrainment rates considering uncertainties in estimated …
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Resource-constrained avionics design for CubeSats
… We present the avionics hardware design for the Microwave Radiometer Technology Acceleration (MiRaTA) 3U CubeSat, funded by the NASA Earth Science Technology Office (ESTO), as a case study for our optimization analysis. MiRaTA will demonstrate a three-band microwave radiometer and GPS radio …
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Microwave Transmission Measurements Using a Radiometer System
… and characterization of a Total Power Radiometer, operating at Ka-Band. The design of the Total Power Radiometer relies upon several factors including, accuracy, stability, and sensitivity. Weighing these factors leads to the design and simulation of a Total Power Radiometer with 0.1 K …
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Calibration and validation for CubeSat Microwave Radiometers
Miniaturized microwave radiometers deployed on nanosatellites in Low Earth Orbit (LEO) are now demonstrating the ability to provide science-quality weather measurements. For instance, the Micro-sized Microwave Atmospheric Satellite-2A (MicroMAS-2A) is a 3U CubeSat launched in January 2018 that …
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Seawinds Radiometer Brightness Temperature Calibration And Validation
… allowed the instrument to function as a QuikSCAT Radiometer (QRad) 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 …
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An Improved Microwave Radiative Transfer Model For Ocean Emissivity At Hurricane Force Surface Wind Speed
An electromagnetic model for predicting the microwave blackbody emission from the ocean surface under the forcing of strong surface winds in hurricanes is being developed. This ocean emissivity model will be incorporated into a larger radiative transfer model used to infer ocean surface wind speed …
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Analyis Of Airborne Microwave Polarimetric Radiometer Measurements In The Presence Of Dynamic Platform Attitude Errors
… remote sensing, and this thesis deals with a new microwave polarimetric radiometer technique for inferring ocean surface wind direction [3, 5, 7]. This technique is based upon the anisotropy of the polarized ocean blackbody emissions at microwave frequencies relative to the azimuth angle between …
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Potential for tsunami detection and early-warning using space-based passive microwave radiometry
… is proposed using a new space-based passive microwave radiometer system. Passive microwave radiometry can 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 …
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