AMSU-A antenna pattern corrections

被引:63
作者
Mo, T [1 ]
机构
[1] NOAA, NESDIS, Div Climate Res & Applicat, Off Res & Applicat, Camp Springs, MD 20746 USA
来源
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 1999年 / 37卷 / 01期
关键词
antenna measurements; antenna radiation patterns; microwave antenna; microwave radiometry; remote sensing; satellite applications; temperature sounding;
D O I
10.1109/36.739131
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
A procedure for making antenna pattern corrections to antenna temperatures of the advanced microwave sounding unit-a (AMSU-A) is developed, Antenna efficiencies, fractions of total power over three different solid-angle regions subtended at the satellite by the earth (plus atmosphere below 20 km), cold space, and the satellite platform, were calculated at 30 earth views and four possible cold space calibration positions, These calculated results simplify the process for correcting antenna temperature measurements to retrieve the true brightness temperatures from AMSU-A data. Using the antenna pattern data and a profile of atmospheric brightness temperature, a set of antenna pattern corrections was simulated for each channel at the 30 earth views and four possible cold space calibration positions. The results show that these corrections can add 0.5 to 2.7 K to the antenna temperatures to retrieve the brightness temperatures and that the cold space calibration temperatures may be raised to 2 K above the nominal cold sky temperature of 2.73 K, Antenna pattern 3-dB beamwidths and main-beam efficiencies were also calculated from the antenna pattern data.
引用
收藏
页码:103 / 112
页数:10
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