Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/31844
Titolo: | Removal and replacement of interference in tied-array radio pulsar observations using the spectral kurtosis estimator | Autori: | Purver,n M. Bassa, C. G. Cognard, I. Janssen, G. H. Karuppusamy, R. Kramer, M. Lee, K. J. Liu, K. McKee, J. W. PERRODIN, DELPHINE Sanidas, S. Smits, R. Stappers, B. W. |
Data pubblicazione: | 2022 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 510 | Fascicolo: | 2 | Da pagina:: | 1597 | Abstract: | We describe how to implement the spectral kurtosis method of interference removal (zapping) on a digitized signal of averaged power values. Spectral kurtosis is a hypothesis test, analogous to the t-test, with a null hypothesis that the amplitudes from which power is formed belong to a `good' distribution -- typically Gaussian with zero mean -- where power values are zapped if the hypothesis is rejected at a specified confidence level. We derive signal-to-noise ratios (SNRs) as a function of amount of zapping for folded radio pulsar observations consisting of a sum of signals from multiple telescopes in independent radio-frequency interference (RFI) environments, comparing four methods to compensate for lost data with coherent (tied-array) and incoherent summation. For coherently summed amplitudes, scaling amplitudes from non-zapped telescopes achieves a higher SNR than replacing zapped amplitudes with artificial noise. For incoherently summed power values, the highest SNR is given by scaling power from non-zapped telescopes to maintain a constant mean. We use spectral kurtosis to clean a tied-array radio pulsar observation by the Large European Array for Pulsars (LEAP): the signal from one telescope is zapped with time and frequency resolutions of 6.25 $\mu$s and 0.16 MHz, removing interference along with 0.27 per cent of `good' data, giving an uncertainty of 0.25 $\mu$s in pulse time of arrival (TOA) for PSR J1022+1001. We use a single-telescope observation to demonstrate recovery of the pulse profile shape, with 0.6 per cent of data zapped and a reduction from 1.22 to 0.70 $\mu$s in TOA uncertainty. | URI: | http://hdl.handle.net/20.500.12386/31844 | URL: | https://academic.oup.com/mnras/article-abstract/510/2/1597/6445038?redirectedFrom=fulltext&login=true http://arxiv.org/abs/2111.14225v2 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stab3434 | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
File in questo documento:
File | Descrizione | Dimensioni | Formato | |
---|---|---|---|---|
stab3434.pdf | Pdf editoriale | 1.95 MB | Adobe PDF | Visualizza/apri |
Page view(s)
43
controllato il 5-ago-2024
Download(s)
20
controllato il 5-ago-2024
Google ScholarTM
Check
Altmetric
Altmetric
Tutti i documenti in DSpace sono pubblicati ad Accesso Aperto, salvo diversa indicazione per alcuni documenti specifici.