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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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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Institute of Electrical and Electronics Engineers
2017
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| Online Access: | http://hdl.handle.net/1721.1/110814 |
| _version_ | 1826198065975918592 |
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| author | Cahoy, K. L. Blackwell, W. J. Bishop, R. Cohen, B. Crail, C. Cucurull, L. Dave, P. DiLiberto, M. Erickson, N. Fish, C. Ho, S. P. Leslie, R. V. Milstein, A. B. Osaretin, I. A. |
| author2 | Space Telecommunications Astronomy and Radiation (STAR) Lab |
| author_facet | Space Telecommunications Astronomy and Radiation (STAR) Lab Cahoy, K. L. Blackwell, W. J. Bishop, R. Cohen, B. Crail, C. Cucurull, L. Dave, P. DiLiberto, M. Erickson, N. Fish, C. Ho, S. P. Leslie, R. V. Milstein, A. B. Osaretin, I. A. |
| author_sort | Cahoy, K. L. |
| 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 | 2024-09-23T10:58:19Z |
| format | Article |
| id | mit-1721.1/110814 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2025-02-19T04:19:28Z |
| publishDate | 2017 |
| publisher | Institute of Electrical and Electronics Engineers |
| record_format | dspace |
| spelling | mit-1721.1/1108142025-02-11T19:58:16Z Radiometer Calibration Using Colocated GPS Radio Occultation Measurements Cahoy, K. L. Blackwell, W. J. Bishop, R. Cohen, B. Crail, C. Cucurull, L. Dave, P. DiLiberto, M. Erickson, N. Fish, C. Ho, S. P. Leslie, R. V. Milstein, A. B. Osaretin, I. A. Space Telecommunications Astronomy and Radiation (STAR) Lab Massachusetts Institute of Technology. Department of Aeronautics and Astronautics Advanced Microwave Sounding Unit (AMSU) calibration Compact Total Electron Count (TEC)/Atmosphere Global Positioning System (GPS) Sensor (CTAGS) CubeSat Global Navigation Satellite System (GNSS) GPS GPS radio occultation (RO) (GPSRO) humidity Micro-sized Microwave Atmospheric Satellite (MicroMAS) microwave Microwave Radiometer Technology Acceleration (MiRaTA) nanosatellite precipitation radiometer remote sensing RO RO-Cal temperature 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. 2017-07-21T21:37:39Z 2017-07-21T21:37:39Z 2014-10 Article 01962892 http://hdl.handle.net/1721.1/110814 Blackwell, WJ, et al. "Radiometer Calibration Using Colocated GPS Radio Occultation Measurements." Ieee Transactions on Geoscience and Remote Sensing, vol. 52, no. 10, n.d., pp. 6423-6433. EBSCOhost, search.ebscohost.com/login.aspx?direct=true&db=edswsc&AN=000337173200035&site=eds-live&scope=site. en_US application/pdf Institute of Electrical and Electronics Engineers |
| spellingShingle | Advanced Microwave Sounding Unit (AMSU) calibration Compact Total Electron Count (TEC)/Atmosphere Global Positioning System (GPS) Sensor (CTAGS) CubeSat Global Navigation Satellite System (GNSS) GPS GPS radio occultation (RO) (GPSRO) humidity Micro-sized Microwave Atmospheric Satellite (MicroMAS) microwave Microwave Radiometer Technology Acceleration (MiRaTA) nanosatellite precipitation radiometer remote sensing RO RO-Cal temperature Cahoy, K. L. Blackwell, W. J. Bishop, R. Cohen, B. Crail, C. Cucurull, L. Dave, P. DiLiberto, M. Erickson, N. Fish, C. Ho, S. P. Leslie, R. V. Milstein, A. B. Osaretin, I. A. 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 |
| topic | Advanced Microwave Sounding Unit (AMSU) calibration Compact Total Electron Count (TEC)/Atmosphere Global Positioning System (GPS) Sensor (CTAGS) CubeSat Global Navigation Satellite System (GNSS) GPS GPS radio occultation (RO) (GPSRO) humidity Micro-sized Microwave Atmospheric Satellite (MicroMAS) microwave Microwave Radiometer Technology Acceleration (MiRaTA) nanosatellite precipitation radiometer remote sensing RO RO-Cal temperature |
| url | http://hdl.handle.net/1721.1/110814 |
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