期刊
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
卷 53, 期 1, 页码 207-218出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TGRS.2014.2320983
关键词
Circular array; geostationary earth orbit (GEO); millimeter-wave sounder; rotating scan; synthetic aperture
类别
资金
- National High-Tech Program of China (863 Program) [2006AA12Z141, 2007AA120701]
- Natural Science Foundation of China [40701100, 40801136]
- Strategic Priority Program on Space Science of the Chinese Academy of Sciences [XDA04060803]
The Geostationary Interferometric Microwave Sounder (GIMS) is a new concept of atmospheric microwave sounder for China's future geostationary Earth orbit meteorological satellite (FY-4). It is a microwave interferometric radiometer (MIR) using aperture synthesis and working in rotating time-sharing mode with a circular antenna array. A GIMS proof-of-concept demonstrator operating in the temperature sounding bands of 50-56 GHz has been successfully developed. The instrument uses a circular array with 28 elements (including one in the center of the array). It is capable of imaging a scene with an angular resolution of about 0.08. and a radiometric resolution of less than 1 K with 5-m integration time within a 5. field of view (FOV). Some theoretical aspects of the imaging characteristics of GIMS are discussed, such as the alias-free FOV, angular resolution, radiometric resolution, and imaging algorithm. Some early tests and preliminary imaging experiments of the GIMS demonstrator are also presented.
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