Reduction of the Instrument Model Error in Aperture Synthesis Radiometers
Aperture synthesis radiometers measure the visibilities of the scene under observation by an antenna array, and based on these visibility measurements, inverse algorithm is employed to reconstruct the brightness temperature of the observed scene. The instrument model plays a key role in the inverse...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IEEE
2018-01-01
|
| Series: | IEEE Access |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/8264707/ |
| _version_ | 1828963728457990144 |
|---|---|
| author | Xiaohui Peng Fei Hu Dong Zhu Yayun Cheng Tao Zheng Hao Hu |
| author_facet | Xiaohui Peng Fei Hu Dong Zhu Yayun Cheng Tao Zheng Hao Hu |
| author_sort | Xiaohui Peng |
| collection | DOAJ |
| description | Aperture synthesis radiometers measure the visibilities of the scene under observation by an antenna array, and based on these visibility measurements, inverse algorithm is employed to reconstruct the brightness temperature of the observed scene. The instrument model plays a key role in the inverse problem and its error will degrade the reconstruction accuracy. This work provides an analysis of the impact of the instrument model error on the reconstruction accuracy and a method regarding how to reduce its impact. It will be demonstrated in this work that the point spread functions (PSFs) of the imaging system at different spatial locations are highly correlated with each other, but the PSF errors are not. Benefit from this fact, the PSF can be represented as a sum of basis functions obtained from principal component analysis of PSF. It can be observed that most of the energy of the true PSF is concentrated on the first L principal components, and the last N-L principal components can be neglected due to that they are dominated by the noise. Numerical studies are carried out using the data obtained from the Soil Moisture and Ocean Salinity (SMOS) official website, and the corresponding results validate that the proposed method is effective in reducing the instrument model error. |
| first_indexed | 2024-12-14T10:34:34Z |
| format | Article |
| id | doaj.art-d00e34614b524233aad09d2b8e9f2a69 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-14T10:34:34Z |
| publishDate | 2018-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-d00e34614b524233aad09d2b8e9f2a692022-12-21T23:05:59ZengIEEEIEEE Access2169-35362018-01-0169238924610.1109/ACCESS.2018.27955308264707Reduction of the Instrument Model Error in Aperture Synthesis RadiometersXiaohui Peng0https://orcid.org/0000-0002-7410-8538Fei Hu1Dong Zhu2Yayun Cheng3Tao Zheng4Hao Hu5School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, ChinaSchool of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, ChinaSchool of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, ChinaSchool of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, ChinaSchool of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, ChinaSchool of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, ChinaAperture synthesis radiometers measure the visibilities of the scene under observation by an antenna array, and based on these visibility measurements, inverse algorithm is employed to reconstruct the brightness temperature of the observed scene. The instrument model plays a key role in the inverse problem and its error will degrade the reconstruction accuracy. This work provides an analysis of the impact of the instrument model error on the reconstruction accuracy and a method regarding how to reduce its impact. It will be demonstrated in this work that the point spread functions (PSFs) of the imaging system at different spatial locations are highly correlated with each other, but the PSF errors are not. Benefit from this fact, the PSF can be represented as a sum of basis functions obtained from principal component analysis of PSF. It can be observed that most of the energy of the true PSF is concentrated on the first L principal components, and the last N-L principal components can be neglected due to that they are dominated by the noise. Numerical studies are carried out using the data obtained from the Soil Moisture and Ocean Salinity (SMOS) official website, and the corresponding results validate that the proposed method is effective in reducing the instrument model error.https://ieeexplore.ieee.org/document/8264707/Aperture synthesis radiometers (ASR)instrument model errorprincipal component analysis (PCA)point spread function |
| spellingShingle | Xiaohui Peng Fei Hu Dong Zhu Yayun Cheng Tao Zheng Hao Hu Reduction of the Instrument Model Error in Aperture Synthesis Radiometers IEEE Access Aperture synthesis radiometers (ASR) instrument model error principal component analysis (PCA) point spread function |
| title | Reduction of the Instrument Model Error in Aperture Synthesis Radiometers |
| title_full | Reduction of the Instrument Model Error in Aperture Synthesis Radiometers |
| title_fullStr | Reduction of the Instrument Model Error in Aperture Synthesis Radiometers |
| title_full_unstemmed | Reduction of the Instrument Model Error in Aperture Synthesis Radiometers |
| title_short | Reduction of the Instrument Model Error in Aperture Synthesis Radiometers |
| title_sort | reduction of the instrument model error in aperture synthesis radiometers |
| topic | Aperture synthesis radiometers (ASR) instrument model error principal component analysis (PCA) point spread function |
| url | https://ieeexplore.ieee.org/document/8264707/ |
| work_keys_str_mv | AT xiaohuipeng reductionoftheinstrumentmodelerrorinaperturesynthesisradiometers AT feihu reductionoftheinstrumentmodelerrorinaperturesynthesisradiometers AT dongzhu reductionoftheinstrumentmodelerrorinaperturesynthesisradiometers AT yayuncheng reductionoftheinstrumentmodelerrorinaperturesynthesisradiometers AT taozheng reductionoftheinstrumentmodelerrorinaperturesynthesisradiometers AT haohu reductionoftheinstrumentmodelerrorinaperturesynthesisradiometers |