Aquarius L-Band Microwave Radiometer: 3 Years of Radiometric Performance and Systematic Effects

被引：11

作者：

Piepmeier, Jeffrey R. ^{[1
]}

Hong, Liang ^{[2
]}

Pellerano, Fernando A. ^{[3
]}

机构：

[1] NASA, Goddard Space Flight Ctr, Microwave Instrument Technol Branch, Greenbelt, MD 20771 USA

[2] NASA, Goddard Space Flight Ctr, Sci Applicat Int Corp, Laurel, MD 20723 USA

[3] NASA, Goddard Space Flight Ctr, Instrument Syst & Technol Div, Greenbelt, MD 20771 USA

来源：

IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING | 2015年 / 8卷 / 12期

关键词：

Calibration; microwave radiometer; CALIBRATION; SALINITY; INSTRUMENT; STABILITY; ORBIT;

D O I：

10.1109/JSTARS.2015.2435493

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The Aquarius L-band microwave radiometer is a three-beam pushbroom instrument designed to measure sea-surface salinity. Results are analyzed for performance and systematic effects over three years of operation. The thermal control system maintains tight temperature stability promoting good gain stability. The gain spectrum exhibits expected orbital variations with 1/f noise appearing at longer time periods. The on-board detection and integration scheme coupled with the calibration algorithm produce antenna temperatures with NEDT <0.16 K for 1.44-s samples. Nonlinearity is characterized before launch and the derived correction is verified with cold-sky calibration (CSC) data. Finally, long-term drift is discovered in all channels with 1-K amplitude and 100-day time constant. Nonetheless, it is adeptly corrected using an exponential model.

引用

页码：5416 / 5423

页数：8

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