Soil Moisture Active/Passive (SMAP) L-Band Microwave Radiometer Post-Launch Calibration Revisit: Approach and Performance
The soil moisture active passive (SMAP) microwave radiometer is a fully-polarimetric <italic>L</italic>-band radiometer flown on the SMAP satellite in a 6 AM /6 PM sun-synchronous orbit at 685-km altitude. After the SMAP L1B_TB data product version 4 was released in 2018, the...
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oai:doaj.org-article:c29c5cee85fe4abba8a690110eab26e12021-11-19T00:00:14ZSoil Moisture Active/Passive (SMAP) L-Band Microwave Radiometer Post-Launch Calibration Revisit: Approach and Performance2151-153510.1109/JSTARS.2021.3121176https://doaj.org/article/c29c5cee85fe4abba8a690110eab26e12021-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/9580700/https://doaj.org/toc/2151-1535The soil moisture active passive (SMAP) microwave radiometer is a fully-polarimetric <italic>L</italic>-band radiometer flown on the SMAP satellite in a 6 AM /6 PM sun-synchronous orbit at 685-km altitude. After the SMAP L1B_TB data product version 4 was released in 2018, the radiometer has undergone further calibration and validation. The goal is to reduce the difference between antenna temperature of ascending and descending orbits during the eclipse, and to reduce the dips in the calibration drift over the cold sky (CS) during the eclipse seasons in 2017 and 2018. The postlaunch calibration algorithm has been revisited by retrieving all of the calibration parameters simultaneously with two different options for the hot calibration source (the global ocean, or the radiometer internal reference load). The performance of the two options are compared here. The option with the radiometer internal reference load has been chosen by the SMAP science team for data release version 5. In addition, a correction offset is applied to the input signal to account for offsets during the early-mission stages with the SMAP synthetic aperture radar transmitter operating alongside the radiometer.Jinzheng PengSidharth MisraJeffrey R. PiepmeierSimon H. YuehDavid M. Le VineEmmanuel P. DinnatRoy Scott DunbarPriscilla N. MohammedSteven K. ChanThomas MeissnerIEEEarticleCalibrationmicrowave radiometerradiometryvalidationOcean engineeringTC1501-1800Geophysics. Cosmic physicsQC801-809ENIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 14, Pp 11406-11416 (2021) |
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DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
Calibration microwave radiometer radiometry validation Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 |
| spellingShingle |
Calibration microwave radiometer radiometry validation Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 Jinzheng Peng Sidharth Misra Jeffrey R. Piepmeier Simon H. Yueh David M. Le Vine Emmanuel P. Dinnat Roy Scott Dunbar Priscilla N. Mohammed Steven K. Chan Thomas Meissner Soil Moisture Active/Passive (SMAP) L-Band Microwave Radiometer Post-Launch Calibration Revisit: Approach and Performance |
| description |
The soil moisture active passive (SMAP) microwave radiometer is a fully-polarimetric <italic>L</italic>-band radiometer flown on the SMAP satellite in a 6 AM /6 PM sun-synchronous orbit at 685-km altitude. After the SMAP L1B_TB data product version 4 was released in 2018, the radiometer has undergone further calibration and validation. The goal is to reduce the difference between antenna temperature of ascending and descending orbits during the eclipse, and to reduce the dips in the calibration drift over the cold sky (CS) during the eclipse seasons in 2017 and 2018. The postlaunch calibration algorithm has been revisited by retrieving all of the calibration parameters simultaneously with two different options for the hot calibration source (the global ocean, or the radiometer internal reference load). The performance of the two options are compared here. The option with the radiometer internal reference load has been chosen by the SMAP science team for data release version 5. In addition, a correction offset is applied to the input signal to account for offsets during the early-mission stages with the SMAP synthetic aperture radar transmitter operating alongside the radiometer. |
| format |
article |
| author |
Jinzheng Peng Sidharth Misra Jeffrey R. Piepmeier Simon H. Yueh David M. Le Vine Emmanuel P. Dinnat Roy Scott Dunbar Priscilla N. Mohammed Steven K. Chan Thomas Meissner |
| author_facet |
Jinzheng Peng Sidharth Misra Jeffrey R. Piepmeier Simon H. Yueh David M. Le Vine Emmanuel P. Dinnat Roy Scott Dunbar Priscilla N. Mohammed Steven K. Chan Thomas Meissner |
| author_sort |
Jinzheng Peng |
| title |
Soil Moisture Active/Passive (SMAP) L-Band Microwave Radiometer Post-Launch Calibration Revisit: Approach and Performance |
| title_short |
Soil Moisture Active/Passive (SMAP) L-Band Microwave Radiometer Post-Launch Calibration Revisit: Approach and Performance |
| title_full |
Soil Moisture Active/Passive (SMAP) L-Band Microwave Radiometer Post-Launch Calibration Revisit: Approach and Performance |
| title_fullStr |
Soil Moisture Active/Passive (SMAP) L-Band Microwave Radiometer Post-Launch Calibration Revisit: Approach and Performance |
| title_full_unstemmed |
Soil Moisture Active/Passive (SMAP) L-Band Microwave Radiometer Post-Launch Calibration Revisit: Approach and Performance |
| title_sort |
soil moisture active/passive (smap) l-band microwave radiometer post-launch calibration revisit: approach and performance |
| publisher |
IEEE |
| publishDate |
2021 |
| url |
https://doaj.org/article/c29c5cee85fe4abba8a690110eab26e1 |
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