A New Antenna Pattern Correction Method for a Cross-Track Scanning Microwave Sounder with Full-Circular Sampling.
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| Title: | A New Antenna Pattern Correction Method for a Cross-Track Scanning Microwave Sounder with Full-Circular Sampling. |
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| Authors: | Fan, Guohong1,2 (AUTHOR), Wang, Zhenzhan1,2 (AUTHOR) wangzhenzhan@mirslab.cn |
| Source: | Remote Sensing. Jan2026, Vol. 18 Issue 2, p277. 24p. |
| Subjects: | Brightness temperature, Microwave radiometers, Microwave remote sensing, Remote sensing, Calibration, Coasts, Sampling (Process) |
| Abstract: | Highlights: What are the main findings? The method proposed in this paper demonstrates higher precision than traditional APC methods in heterogeneous coastline scenes. By incorporating cross-track outer-swath samplings into the matrix inversion process, the method effectively improves the APC precision for pixels near the swath edges. What are the implications of the main findings? The proposed method can more effectively correct antenna pattern effects over complex land surface types and coastal transition regions, thereby improving brightness temperature precision and enhancing the applicability of satellite data over land and nearshore regions. This is particularly the case for microwave radiometers with low antenna beam efficiency or large beamwidth. This research highlights the significance of outer-swath sampling for APC in edge regions and provides a valuable reference for APC and sampling strategies in other radiometers. The measured antenna temperature of microwave radiometers differs from the true brightness temperature due to antenna pattern effects. Corrections for the antenna pattern effects constitutes an essential component of microwave radiometer calibration. The Compact Atmospheric Microwave Sounder (CAMS) is a cross-track scanning microwave designed for small satellites. It adopts full-circle sampling on the scan plane. Leveraging its special scan geometry, a new method of antenna pattern correction (APC) is developed. This method utilizes adjacent samplings from consecutive scans to obtain APC coefficients, and correct antenna temperature to the pixel level brightness temperature. For the first time, real samplings from beyond the Earth swath are introduced to assist APC near the swath edges. The performance of the method are analyzed through scenarios of coastlines and Earth swath edges. Analysis in the coastline scenarios demonstrates that the proposed method is more effective in correcting antenna pattern effects and detecting brightness temperature variations than traditional APC approaches in heterogeneous Earth scenarios. Comparative analysis of the method at Earth swath edges demonstrates that the introduction of samplings outside the swath effectively enhances the precision of corrected brightness temperature at swath edges. This method provides a reference for antenna pattern correction and sampling strategy in other microwave radiometers. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Highlights: What are the main findings? The method proposed in this paper demonstrates higher precision than traditional APC methods in heterogeneous coastline scenes. By incorporating cross-track outer-swath samplings into the matrix inversion process, the method effectively improves the APC precision for pixels near the swath edges. What are the implications of the main findings? The proposed method can more effectively correct antenna pattern effects over complex land surface types and coastal transition regions, thereby improving brightness temperature precision and enhancing the applicability of satellite data over land and nearshore regions. This is particularly the case for microwave radiometers with low antenna beam efficiency or large beamwidth. This research highlights the significance of outer-swath sampling for APC in edge regions and provides a valuable reference for APC and sampling strategies in other radiometers. The measured antenna temperature of microwave radiometers differs from the true brightness temperature due to antenna pattern effects. Corrections for the antenna pattern effects constitutes an essential component of microwave radiometer calibration. The Compact Atmospheric Microwave Sounder (CAMS) is a cross-track scanning microwave designed for small satellites. It adopts full-circle sampling on the scan plane. Leveraging its special scan geometry, a new method of antenna pattern correction (APC) is developed. This method utilizes adjacent samplings from consecutive scans to obtain APC coefficients, and correct antenna temperature to the pixel level brightness temperature. For the first time, real samplings from beyond the Earth swath are introduced to assist APC near the swath edges. The performance of the method are analyzed through scenarios of coastlines and Earth swath edges. Analysis in the coastline scenarios demonstrates that the proposed method is more effective in correcting antenna pattern effects and detecting brightness temperature variations than traditional APC approaches in heterogeneous Earth scenarios. Comparative analysis of the method at Earth swath edges demonstrates that the introduction of samplings outside the swath effectively enhances the precision of corrected brightness temperature at swath edges. This method provides a reference for antenna pattern correction and sampling strategy in other microwave radiometers. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 20724292 |
| DOI: | 10.3390/rs18020277 |
