TY - JOUR
T1 - A morphological algorithm for improving radio-frequency interference detection
AU - Offringa, A. R.
AU - van de Gronde, J. J.
AU - Roerdink, J. B. T. M.
N1 - Relation: http://www.rug.nl/research/jbi/
Rights: University of Groningen, Johann Bernoulli Institute for Mathematics and Computer Science
PY - 2012/3
Y1 - 2012/3
N2 - A technique is described that is used to improve the detection of radio-frequency interference in astronomical radio observatories. It is applied on a two-dimensional interference mask after regular detection in the time-frequency domain with existing techniques. The scale-invariant rank (SIR) operator is defined, which is a one-dimensional mathematical morphology technique that can be used to find adjacent intervals in the time or frequency domain that are likely to be affected by RFI. The technique might also be applicable in other areas in which morphological scale-invariant behaviour is desired, such as source detection. A new algorithm is described, that is shown to perform quite well, has linear time complexity and is fast enough to be applied in modern high resolution observatories. It is used in the default pipeline of the LOFAR observatory.
AB - A technique is described that is used to improve the detection of radio-frequency interference in astronomical radio observatories. It is applied on a two-dimensional interference mask after regular detection in the time-frequency domain with existing techniques. The scale-invariant rank (SIR) operator is defined, which is a one-dimensional mathematical morphology technique that can be used to find adjacent intervals in the time or frequency domain that are likely to be affected by RFI. The technique might also be applicable in other areas in which morphological scale-invariant behaviour is desired, such as source detection. A new algorithm is described, that is shown to perform quite well, has linear time complexity and is fast enough to be applied in modern high resolution observatories. It is used in the default pipeline of the LOFAR observatory.
KW - instrumentation: interferometers
KW - methods: data analysis
KW - techniques: interferometric
KW - RADIO TELESCOPES
KW - MITIGATION
KW - ASTRONOMY
UR - http://adsabs.harvard.edu/abs/2012A%26A...539A..95O
U2 - 10.1051/0004-6361/201118497
DO - 10.1051/0004-6361/201118497
M3 - Article
SN - 0004-6361
VL - 539
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
M1 - A95
ER -