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| Engineering Evaluation of Multi-beam Satellite Antenna Boresight Pointing using Land/Water Crossings | |
| May;Catherine Susan | |
| 出版年 | 2012 |
| 学位授予单位 | University of Central Florida |
| 英文摘要 | The Microwave Radiometer (MWR) on the Aquarius/SAC-D mission measures microwave radiation from earth and intervening atmosphere in terms of brightness temperature (Tb). It takes measurements in a push-broom fashion at K (23.8GHz) and Ka (36.5 GHz) band frequencies using two separate antenna systems, each producing eight antenna beams. Pre-launch knowledge of the alignment of these beams with respect to the space-craft is used to geolocate the antenna footprints on ground. As a part of MWR's on-orbit engineering check-out, the verification of MWR's pointing accuracy is discussed here. The technique used to assess MWR's pointing involved comparing the radiometer image of land with high-resolution maps. When the beam's instantaneous field of view (IFOV) passes over a land water boundary, the brightness temperature changes from a radiometrically hot land scene to a radiometrically cold ocean scene. This “step-function” change in brightness temperature provides a very sensitive way to characterize the mispointing error of the MWR sensor antenna footprints. This thesis describes the algorithm used for the MWR geolocation calibration. MWR sensor observed boundaries are determined by the absolute maximum Tb slope location. A system of linear equations is produced for each sensor observed land/water crossing to determine the true intersection of the MWR track with the coastline. The observed and expected boundary locations are compared by means of an error distance. Results, presented for all eight beams of the three MWR channels, show that the mispointing error (standard deviations) are overall less than 15 km from the true coastline. ID: 031001289; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Adviser: W. Linwood Jones.; Title from PDF title page (viewed February 28, 2013).; Thesis (M.S.E.E.)--University of Central Florida, 2012.; Includes bibliographical references (p. 70). M.S.E.E. Masters Electrical Engineering and Computing Engineering and Computer Science Electrical Engineering |
| 语种 | 英语 |
| URL | http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5428 |
| 来源机构 | University of Central Florida |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/246876 |
| 推荐引用方式 GB/T 7714 | May;Catherine Susan. Engineering Evaluation of Multi-beam Satellite Antenna Boresight Pointing using Land/Water Crossings[D]. University of Central Florida,2012. |
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