One-Point Calibration for Soil Moisture Active/Passive (SMAP) L-Band Microwave Radiometer
The SMAP microwave radiometer's antenna temperature (TA) is computed from the radiometer outputs using a conventional two-point calibration method. The receiver's gain and noise temperature are calibrated using the internal reference load and internal noise diode. Then, the TA...
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| Format: | Article |
| Language: | English |
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IEEE
2025-01-01
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| Series: | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
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| Online Access: | https://ieeexplore.ieee.org/document/10759799/ |
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| author | Jinzheng Peng Jeffrey R. Piepmeier Sidharth Misra Priscilla Mohammed Alexandra Bringer |
| author_facet | Jinzheng Peng Jeffrey R. Piepmeier Sidharth Misra Priscilla Mohammed Alexandra Bringer |
| author_sort | Jinzheng Peng |
| collection | DOAJ |
| description | The SMAP microwave radiometer's antenna temperature (TA) is computed from the radiometer outputs using a conventional two-point calibration method. The receiver's gain and noise temperature are calibrated using the internal reference load and internal noise diode. Then, the TA is derived. To provide an alternative to the current internal calibration approach for the SMAP L-band microwave radiometer and to determine the potential for reducing hardware for and cost of future projects, one-point calibration is studied. In this work, the internal reference load is used as the single source for one-point calibration, and the receiver noise temperature is modeled. The performance of the one-point calibration is validated by comparing the calibrated TAs, their uncertainties, and long-term calibration drifts to those of the conventional two-point calibration. Comparison results show that one-point calibration can achieve comparable performance, i.e., no larger than 0.07 K rms difference in calibrated TA, to the conventional two-point calibration. In addition, the long-term stability of the internal noise source is also included in the analysis. |
| format | Article |
| id | doaj-art-13e9b58470ca48eba53376e8691a267c |
| institution | OA Journals |
| issn | 1939-1404 2151-1535 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| spelling | doaj-art-13e9b58470ca48eba53376e8691a267c2025-08-20T02:30:50ZengIEEEIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing1939-14042151-15352025-01-011865566210.1109/JSTARS.2024.349973510759799One-Point Calibration for Soil Moisture Active/Passive (SMAP) L-Band Microwave RadiometerJinzheng Peng0https://orcid.org/0000-0003-2213-7182Jeffrey R. Piepmeier1https://orcid.org/0000-0003-1207-9281Sidharth Misra2https://orcid.org/0000-0003-1738-6635Priscilla Mohammed3https://orcid.org/0000-0003-1649-1548Alexandra Bringer4NASA Goddard Space Flight Center, Greenbelt, MD, USANASA Goddard Space Flight Center, Greenbelt, MD, USAJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USANASA Goddard Space Flight Center, Greenbelt, MD, USANASA Goddard Space Flight Center, Greenbelt, MD, USAThe SMAP microwave radiometer's antenna temperature (TA) is computed from the radiometer outputs using a conventional two-point calibration method. The receiver's gain and noise temperature are calibrated using the internal reference load and internal noise diode. Then, the TA is derived. To provide an alternative to the current internal calibration approach for the SMAP L-band microwave radiometer and to determine the potential for reducing hardware for and cost of future projects, one-point calibration is studied. In this work, the internal reference load is used as the single source for one-point calibration, and the receiver noise temperature is modeled. The performance of the one-point calibration is validated by comparing the calibrated TAs, their uncertainties, and long-term calibration drifts to those of the conventional two-point calibration. Comparison results show that one-point calibration can achieve comparable performance, i.e., no larger than 0.07 K rms difference in calibrated TA, to the conventional two-point calibration. In addition, the long-term stability of the internal noise source is also included in the analysis.https://ieeexplore.ieee.org/document/10759799/Calibrationmicrowave radiometrynoise source |
| spellingShingle | Jinzheng Peng Jeffrey R. Piepmeier Sidharth Misra Priscilla Mohammed Alexandra Bringer One-Point Calibration for Soil Moisture Active/Passive (SMAP) L-Band Microwave Radiometer IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing Calibration microwave radiometry noise source |
| title | One-Point Calibration for Soil Moisture Active/Passive (SMAP) L-Band Microwave Radiometer |
| title_full | One-Point Calibration for Soil Moisture Active/Passive (SMAP) L-Band Microwave Radiometer |
| title_fullStr | One-Point Calibration for Soil Moisture Active/Passive (SMAP) L-Band Microwave Radiometer |
| title_full_unstemmed | One-Point Calibration for Soil Moisture Active/Passive (SMAP) L-Band Microwave Radiometer |
| title_short | One-Point Calibration for Soil Moisture Active/Passive (SMAP) L-Band Microwave Radiometer |
| title_sort | one point calibration for soil moisture active x002f passive smap l band microwave radiometer |
| topic | Calibration microwave radiometry noise source |
| url | https://ieeexplore.ieee.org/document/10759799/ |
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