Performance Analysis Techniques for Real-Time Broadband RFI Filtering System of uGMRT

Electromagnetic radiation from human activities, known as man-made Radio Frequency Interference (RFI), adversely affects radio astronomy observations. In the vicinity of the Upgraded Giant Metrewave Radio Telescope (uGMRT) array, the sparking on power lines is the major cause of interference at obse...

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Bibliographic Details
Published inJournal of Astronomical Instrumentation Vol. 11; no. 2
Main Authors Buch, K. D., Kale, R., Naik, K. D., Aragade, R., Muley, M., Kudale, S., Ajith Kumar, B.
Format Journal Article
LanguageEnglish
Published Singapore World Scientific Publishing Company 01.06.2022
World Scientific Publishing Co. Pte., Ltd
Subjects
Beamforming
Broadband
Cross correlation
Data analysis
Electromagnetic radiation
Filtration
Fourier transforms
Human influences
Power lines
Radio astronomy
Radio frequency
Radio frequency interference
Radio telescopes
Real time
Signal processing
Radio frequency interference
RFI filtering
powerline RFI
radio telescope
broadband RFI
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Summary:Electromagnetic radiation from human activities, known as man-made Radio Frequency Interference (RFI), adversely affects radio astronomy observations. In the vicinity of the Upgraded Giant Metrewave Radio Telescope (uGMRT) array, the sparking on power lines is the major cause of interference at observing frequencies less than 800 MHz. A real-time broadband RFI detection and filtering system is implemented as part of the uGMRT wideband signal processing backend to mitigate the effect of broadband RFI. Performance analysis techniques used for testing and commissioning the system for observations in the beamformer and correlator modes of the uGMRT are presented. The concept and implementation of recording simultaneous unfiltered and filtered data along with data analysis and interpretation is illustrated using an example. For the beamformer mode, spectrogram, single spectral channel, and its Fourier transform is used for performance analysis whereas, in the correlator mode, the cross-correlation function, closure phase, and visibilities from the simultaneously recorded unfiltered and filtered is carried out. These techniques are used for testing the performance of the broadband RFI filter and releasing it for uGMRT users.
ISSN:2251-1717
2251-1725
DOI:10.1142/S2251171722500088