Geophysical parameter estimation with a passive microwave spectrometer at 54 / 118 / 183 / 425 GHz
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.
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| Формат: | Дисертація |
| Мова: | en_US |
| Опубліковано: |
Massachusetts Institute of Technology
2005
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| Онлайн доступ: | http://hdl.handle.net/1721.1/28692 |
| _version_ | 1826212051565936640 |
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| author | Leslie, Robert Vincent, 1972- |
| author2 | David H. Staelin. |
| author_facet | David H. Staelin. Leslie, Robert Vincent, 1972- |
| author_sort | Leslie, Robert Vincent, 1972- |
| collection | MIT |
| description | Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004. |
| first_indexed | 2024-09-23T15:15:41Z |
| format | Thesis |
| id | mit-1721.1/28692 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:15:41Z |
| publishDate | 2005 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/286922019-04-12T09:11:01Z Geophysical parameter estimation with a passive microwave spectrometer at 54 / 118 / 183 / 425 GHz Leslie, Robert Vincent, 1972- David H. Staelin. Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. Electrical Engineering and Computer Science. Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004. Includes bibliographical references (p. 263-271). (cont.) model of a convective cell is presented that provides a physical basis for this relationship. The National Polar-orbiting Operational Environmental Satellite System (NPOESS) Aircraft Sounder Testbed-Microwave, or NAST-M, includes passive microwave spectrometers operating near the oxygen lines at 50-57 GHz, 118.75 GHz, and 424.76 GHz, and a spectrometer centered on the water vapor absorption line at 183.31 GHz. All four of the spectrometers' antenna horns are colocated, have 3-dB (full-width at half-max) beamwidths of 7.5⁰, and are directed at a single mirror that scans cross-track beneath the aircraft with a swath up to 100-km wide. The 183.31- and 424.76-GHz systems were developed as part of this thesis. The calibration techniques for two high-altitude airborne platforms are described and validated for two recent deployments. During these two deployments, various precipitation phenomena were imaged by NAST-M's radiometric and video instruments. Retrieval methods were developed and tested for single-pixel rain rate, precipitation cell-top altitude, and cloud-top altitude retrievals of convective cells. The basis of the single-pixel retrievals is a simplified convective-cell hydrometeor-profile model used with a radiative transfer solution that included absorption by atmospheric gases and by hydrometeor absorption and scattering. Two retrieval techniques were used to relate the simulated brightness temperatures to the actual brightness temperatures from the deployments. Case studies are presented from each deployment. In addition, a technique for estimating the cell-wide aggregate rain rate (km² · mm/hr) is presented based on the microwave radiometric signature. The cumulative 3-decibel perturbation areas of convective cells in the four frequency bands are shown to be related to their aggregate rain rates. A simple three-dimensional by R. Vincent Leslie. Sc.D. 2005-09-27T17:47:59Z 2005-09-27T17:47:59Z 2004 2004 Thesis http://hdl.handle.net/1721.1/28692 59007884 en_US M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 271 p. 13073198 bytes 13109168 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Electrical Engineering and Computer Science. Leslie, Robert Vincent, 1972- Geophysical parameter estimation with a passive microwave spectrometer at 54 / 118 / 183 / 425 GHz |
| title | Geophysical parameter estimation with a passive microwave spectrometer at 54 / 118 / 183 / 425 GHz |
| title_full | Geophysical parameter estimation with a passive microwave spectrometer at 54 / 118 / 183 / 425 GHz |
| title_fullStr | Geophysical parameter estimation with a passive microwave spectrometer at 54 / 118 / 183 / 425 GHz |
| title_full_unstemmed | Geophysical parameter estimation with a passive microwave spectrometer at 54 / 118 / 183 / 425 GHz |
| title_short | Geophysical parameter estimation with a passive microwave spectrometer at 54 / 118 / 183 / 425 GHz |
| title_sort | geophysical parameter estimation with a passive microwave spectrometer at 54 118 183 425 ghz |
| topic | Electrical Engineering and Computer Science. |
| url | http://hdl.handle.net/1721.1/28692 |
| work_keys_str_mv | AT leslierobertvincent1972 geophysicalparameterestimationwithapassivemicrowavespectrometerat54118183425ghz |