Spatial filtering of near-field radio frequency interference at a LOFAR LBA station
© 2016 IEEE. In preparation for the SKA, many new RFI (radio frequency interference) mitigation algorithms have been developed. However, these algorithms usually assume that the RFI source is in the far-field and that the array is calibrated. In this paper, the recovery of astronomical signals from...
| Main Authors: | , , |
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| Format: | Conference Paper |
| Published: |
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/72475 |
| _version_ | 1848762760229289984 |
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| author | Steeb, J. Davidson, David Wijnholds, S. |
| author_facet | Steeb, J. Davidson, David Wijnholds, S. |
| author_sort | Steeb, J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2016 IEEE. In preparation for the SKA, many new RFI (radio frequency interference) mitigation algorithms have been developed. However, these algorithms usually assume that the RFI source is in the far-field and that the array is calibrated. In this paper, the recovery of astronomical signals from uncalibrated RFI-corrupted LOFAR visibility data using spatial filtering methods are presented. For this demonstration, a near-field continuous-wave RFI source was generated by a hexacopter that was flown around one of the LOFAR LBA (low-band antenna) arrays. Four spatial filtering methods were applied to the RFI contaminated data: orthogonal projection, orthogonal projection with subspace bias correction, oblique projection and subspace subtraction. Overall, orthogonal projection with subspace bias correction performed the best, however it requires that the RFI source moves relative to the array and it is computationally expensive. Oblique projection performs similar to orthogonal projection with subspace bias correction when point sources are to be recovered and is furthermore considerably less computationally expensive. Subspace subtraction is a suitable alternative if a large field of view is to be recovered at a relatively low computational cost. |
| first_indexed | 2025-11-14T10:52:41Z |
| format | Conference Paper |
| id | curtin-20.500.11937-72475 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:52:41Z |
| publishDate | 2017 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-724752018-12-13T09:35:13Z Spatial filtering of near-field radio frequency interference at a LOFAR LBA station Steeb, J. Davidson, David Wijnholds, S. © 2016 IEEE. In preparation for the SKA, many new RFI (radio frequency interference) mitigation algorithms have been developed. However, these algorithms usually assume that the RFI source is in the far-field and that the array is calibrated. In this paper, the recovery of astronomical signals from uncalibrated RFI-corrupted LOFAR visibility data using spatial filtering methods are presented. For this demonstration, a near-field continuous-wave RFI source was generated by a hexacopter that was flown around one of the LOFAR LBA (low-band antenna) arrays. Four spatial filtering methods were applied to the RFI contaminated data: orthogonal projection, orthogonal projection with subspace bias correction, oblique projection and subspace subtraction. Overall, orthogonal projection with subspace bias correction performed the best, however it requires that the RFI source moves relative to the array and it is computationally expensive. Oblique projection performs similar to orthogonal projection with subspace bias correction when point sources are to be recovered and is furthermore considerably less computationally expensive. Subspace subtraction is a suitable alternative if a large field of view is to be recovered at a relatively low computational cost. 2017 Conference Paper http://hdl.handle.net/20.500.11937/72475 10.1109/RFINT.2016.7833544 restricted |
| spellingShingle | Steeb, J. Davidson, David Wijnholds, S. Spatial filtering of near-field radio frequency interference at a LOFAR LBA station |
| title | Spatial filtering of near-field radio frequency interference at a LOFAR LBA station |
| title_full | Spatial filtering of near-field radio frequency interference at a LOFAR LBA station |
| title_fullStr | Spatial filtering of near-field radio frequency interference at a LOFAR LBA station |
| title_full_unstemmed | Spatial filtering of near-field radio frequency interference at a LOFAR LBA station |
| title_short | Spatial filtering of near-field radio frequency interference at a LOFAR LBA station |
| title_sort | spatial filtering of near-field radio frequency interference at a lofar lba station |
| url | http://hdl.handle.net/20.500.11937/72475 |