RFI Detection and Mitigation for Advanced Correlators in Interferometric Radiometers
This work presents the first RFI detection and mitigation algorithm for the interferometric radiometers that will be implemented in its correlator unit. The algorithm operates in the time and frequency domains, applying polarimetric and statistical tests in both domains, and exhibiting a tunable and...
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| Format: | Article |
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MDPI AG
2022-09-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/14/18/4672 |
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| author | Adrian Perez-Portero Jorge Querol Adriano Camps Manuel Martin-Neira Martin Suess Juan Ignacio Ramirez Alberto Zurita Josep Closa Roger Oliva Raul Onrubia |
| author_facet | Adrian Perez-Portero Jorge Querol Adriano Camps Manuel Martin-Neira Martin Suess Juan Ignacio Ramirez Alberto Zurita Josep Closa Roger Oliva Raul Onrubia |
| author_sort | Adrian Perez-Portero |
| collection | DOAJ |
| description | This work presents the first RFI detection and mitigation algorithm for the interferometric radiometers that will be implemented in its correlator unit. The algorithm operates in the time and frequency domains, applying polarimetric and statistical tests in both domains, and exhibiting a tunable and arbitrary low probability of false alarm. It is scalable to a configurable number of receivers, and it is optimized in terms of quantization bits and the implementation of the cross-correlations in the time or frequency domains for hardware resource saving. New features of this algorithm are the computation of the Stokes parameters per frequency bin in the Short-Time Fourier Transform and a new parameter called Polarimetric Kurtosis. If RFI is detected in one domain or in both, it is removed using the calculated blanking masks. The optimum algorithm parameters are computed, such as length of the FFTs, the threshold selection for a given probability of false alarm, and the selection of the blanking masks. Last, an important result refers to the application of Parseval’s theorem for the computation of the cross-correlations in the frequency domain, instead of in the time domain, which is more efficient and leads to smaller errors even when using moderate quantization levels. The algorithm has been developed in the framework of the ESA’s technology preparation for a potential L-band radiometer mission beyond SMOS. However, it is also applicable to (polarimetric) real aperture radiometers, and its performance would improve if more than one bit is used in the signal quantization. |
| first_indexed | 2024-03-09T22:36:27Z |
| format | Article |
| id | doaj.art-1fb4a4ee2bc14c6491b5577983d58e30 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-09T22:36:27Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-1fb4a4ee2bc14c6491b5577983d58e302023-11-23T18:46:38ZengMDPI AGRemote Sensing2072-42922022-09-011418467210.3390/rs14184672RFI Detection and Mitigation for Advanced Correlators in Interferometric RadiometersAdrian Perez-Portero0Jorge Querol1Adriano Camps2Manuel Martin-Neira3Martin Suess4Juan Ignacio Ramirez5Alberto Zurita6Josep Closa7Roger Oliva8Raul Onrubia9CommSensLab, Department of Signal Theory and Communications, Universitat Politècnica de Catalunya, c/Jordi Girona 1–3, 08034 Barcelona, SpainMITIC Solutions S.L., 08017 Barcelona, SpainCommSensLab, Department of Signal Theory and Communications, Universitat Politècnica de Catalunya, c/Jordi Girona 1–3, 08034 Barcelona, SpainEuropean Space Agency, ESTEC, 2201 Noordwijk, The NetherlandsEuropean Space Agency, ESTEC, 2201 Noordwijk, The NetherlandsAirbus Madrid, 28001 Madrid, SpainAirbus Madrid, 28001 Madrid, SpainAirbus Madrid, 28001 Madrid, SpainZenithal Blue Technologies, 08023 Barcelona, SpainZenithal Blue Technologies, 08023 Barcelona, SpainThis work presents the first RFI detection and mitigation algorithm for the interferometric radiometers that will be implemented in its correlator unit. The algorithm operates in the time and frequency domains, applying polarimetric and statistical tests in both domains, and exhibiting a tunable and arbitrary low probability of false alarm. It is scalable to a configurable number of receivers, and it is optimized in terms of quantization bits and the implementation of the cross-correlations in the time or frequency domains for hardware resource saving. New features of this algorithm are the computation of the Stokes parameters per frequency bin in the Short-Time Fourier Transform and a new parameter called Polarimetric Kurtosis. If RFI is detected in one domain or in both, it is removed using the calculated blanking masks. The optimum algorithm parameters are computed, such as length of the FFTs, the threshold selection for a given probability of false alarm, and the selection of the blanking masks. Last, an important result refers to the application of Parseval’s theorem for the computation of the cross-correlations in the frequency domain, instead of in the time domain, which is more efficient and leads to smaller errors even when using moderate quantization levels. The algorithm has been developed in the framework of the ESA’s technology preparation for a potential L-band radiometer mission beyond SMOS. However, it is also applicable to (polarimetric) real aperture radiometers, and its performance would improve if more than one bit is used in the signal quantization.https://www.mdpi.com/2072-4292/14/18/4672radio frequency interferencedetectionmitigationtemporalspectralpolarimetric |
| spellingShingle | Adrian Perez-Portero Jorge Querol Adriano Camps Manuel Martin-Neira Martin Suess Juan Ignacio Ramirez Alberto Zurita Josep Closa Roger Oliva Raul Onrubia RFI Detection and Mitigation for Advanced Correlators in Interferometric Radiometers Remote Sensing radio frequency interference detection mitigation temporal spectral polarimetric |
| title | RFI Detection and Mitigation for Advanced Correlators in Interferometric Radiometers |
| title_full | RFI Detection and Mitigation for Advanced Correlators in Interferometric Radiometers |
| title_fullStr | RFI Detection and Mitigation for Advanced Correlators in Interferometric Radiometers |
| title_full_unstemmed | RFI Detection and Mitigation for Advanced Correlators in Interferometric Radiometers |
| title_short | RFI Detection and Mitigation for Advanced Correlators in Interferometric Radiometers |
| title_sort | rfi detection and mitigation for advanced correlators in interferometric radiometers |
| topic | radio frequency interference detection mitigation temporal spectral polarimetric |
| url | https://www.mdpi.com/2072-4292/14/18/4672 |
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