Radiometer Calibration Using Colocated GPS Radio Occultation Measurements
We present a new high-fidelity method of calibrating a cross-track scanning microwave radiometer using Global Positioning System (GPS) radio occultation (GPSRO) measurements. The radiometer and GPSRO receiver periodically observe the same volume of atmosphere near the Earth's limb, and these ov...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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2015
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| Online Access: | http://hdl.handle.net/1721.1/97547 https://orcid.org/0000-0002-7791-5124 https://orcid.org/0000-0001-5630-6840 |
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| author | Blackwell, William J. Bishop, Rebecca Cahoy, Kerri Crail, Clayton Cucurull, Lidia DiLiberto, Michael Erickson, Neal Fish, Chad Shu-peng Ho, Chad Leslie, R. Vincent Milstein, Adam B. Osaretin, Idahosa A. Cohen, Brian S. Dave, Pratik K. |
| author2 | Lincoln Laboratory |
| author_facet | Lincoln Laboratory Blackwell, William J. Bishop, Rebecca Cahoy, Kerri Crail, Clayton Cucurull, Lidia DiLiberto, Michael Erickson, Neal Fish, Chad Shu-peng Ho, Chad Leslie, R. Vincent Milstein, Adam B. Osaretin, Idahosa A. Cohen, Brian S. Dave, Pratik K. |
| author_sort | Blackwell, William J. |
| collection | MIT |
| description | We present a new high-fidelity method of calibrating a cross-track scanning microwave radiometer using Global Positioning System (GPS) radio occultation (GPSRO) measurements. The radiometer and GPSRO receiver periodically observe the same volume of atmosphere near the Earth's limb, and these overlapping measurements are used to calibrate the radiometer. Performance analyses show that absolute calibration accuracy better than 0.25 K is achievable for temperature sounding channels in the 50-60-GHz band for a total-power radiometer using a weakly coupled noise diode for frequent calibration and proximal GPSRO measurements for infrequent (approximately daily) calibration. The method requires GPSRO penetration depth only down to the stratosphere, thus permitting the use of a relatively small GPS antenna. Furthermore, only coarse spacecraft angular knowledge (approximately one degree rms) is required for the technique, as more precise angular knowledge can be retrieved directly from the combined radiometer and GPSRO data, assuming that the radiometer angular sampling is uniform. These features make the technique particularly well suited for implementation on a low-cost CubeSat hosting both radiometer and GPSRO receiver systems on the same spacecraft. We describe a validation platform for this calibration method, the Microwave Radiometer Technology Acceleration (MiRaTA) CubeSat, currently in development for the National Aeronautics and Space Administration (NASA) Earth Science Technology Office. MiRaTA will fly a multiband radiometer and the Compact TEC/Atmosphere GPS Sensor in 2015. |
| first_indexed | 2024-09-23T11:26:25Z |
| format | Article |
| id | mit-1721.1/97547 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:26:25Z |
| publishDate | 2015 |
| record_format | dspace |
| spelling | mit-1721.1/975472022-09-27T19:30:56Z Radiometer Calibration Using Colocated GPS Radio Occultation Measurements Blackwell, William J. Bishop, Rebecca Cahoy, Kerri Crail, Clayton Cucurull, Lidia DiLiberto, Michael Erickson, Neal Fish, Chad Shu-peng Ho, Chad Leslie, R. Vincent Milstein, Adam B. Osaretin, Idahosa A. Cohen, Brian S. Dave, Pratik K. Lincoln Laboratory Massachusetts Institute of Technology. Department of Aeronautics and Astronautics Blackwell, William J. Cahoy, Kerri Cohen, Brian S. Crail, Clayton Dave, Pratik K. DiLiberto, Michael Leslie, R. Vincent Milstein, Adam B. Osaretin, Idahosa A. We present a new high-fidelity method of calibrating a cross-track scanning microwave radiometer using Global Positioning System (GPS) radio occultation (GPSRO) measurements. The radiometer and GPSRO receiver periodically observe the same volume of atmosphere near the Earth's limb, and these overlapping measurements are used to calibrate the radiometer. Performance analyses show that absolute calibration accuracy better than 0.25 K is achievable for temperature sounding channels in the 50-60-GHz band for a total-power radiometer using a weakly coupled noise diode for frequent calibration and proximal GPSRO measurements for infrequent (approximately daily) calibration. The method requires GPSRO penetration depth only down to the stratosphere, thus permitting the use of a relatively small GPS antenna. Furthermore, only coarse spacecraft angular knowledge (approximately one degree rms) is required for the technique, as more precise angular knowledge can be retrieved directly from the combined radiometer and GPSRO data, assuming that the radiometer angular sampling is uniform. These features make the technique particularly well suited for implementation on a low-cost CubeSat hosting both radiometer and GPSRO receiver systems on the same spacecraft. We describe a validation platform for this calibration method, the Microwave Radiometer Technology Acceleration (MiRaTA) CubeSat, currently in development for the National Aeronautics and Space Administration (NASA) Earth Science Technology Office. MiRaTA will fly a multiband radiometer and the Compact TEC/Atmosphere GPS Sensor in 2015. United States. Dept. of Defense. Assistant Secretary of Defense for Research & Engineering (United States. Air Force Contract FA8721-05-C-0002) 2015-06-29T15:06:13Z 2015-06-29T15:06:13Z 2014-05 2013-11 Article http://purl.org/eprint/type/JournalArticle 0196-2892 1558-0644 http://hdl.handle.net/1721.1/97547 Blackwell, William J., Rebecca Bishop, Kerri Cahoy, Brian Cohen, Clayton Crail, Lidia Cucurull, Pratik Dave, et al. “Radiometer Calibration Using Colocated GPS Radio Occultation Measurements.” IEEE Transactions on Geoscience and Remote Sensing 52, no. 10 (October 2014): 6423–6433. https://orcid.org/0000-0002-7791-5124 https://orcid.org/0000-0001-5630-6840 en_US http://dx.doi.org/10.1109/tgrs.2013.2296558 IEEE Transactions on Geoscience and Remote Sensing Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Prof. Cahoy via Barbara Williams |
| spellingShingle | Blackwell, William J. Bishop, Rebecca Cahoy, Kerri Crail, Clayton Cucurull, Lidia DiLiberto, Michael Erickson, Neal Fish, Chad Shu-peng Ho, Chad Leslie, R. Vincent Milstein, Adam B. Osaretin, Idahosa A. Cohen, Brian S. Dave, Pratik K. Radiometer Calibration Using Colocated GPS Radio Occultation Measurements |
| title | Radiometer Calibration Using Colocated GPS Radio Occultation Measurements |
| title_full | Radiometer Calibration Using Colocated GPS Radio Occultation Measurements |
| title_fullStr | Radiometer Calibration Using Colocated GPS Radio Occultation Measurements |
| title_full_unstemmed | Radiometer Calibration Using Colocated GPS Radio Occultation Measurements |
| title_short | Radiometer Calibration Using Colocated GPS Radio Occultation Measurements |
| title_sort | radiometer calibration using colocated gps radio occultation measurements |
| url | http://hdl.handle.net/1721.1/97547 https://orcid.org/0000-0002-7791-5124 https://orcid.org/0000-0001-5630-6840 |
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