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    • Detection, excision and statistics of interference at the Mauritius radio telescope

      S. Sachdev N. Udaya Shankar

      Volume 22 Issue 2-3 June 2001 pp 213-227

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/022/02-03/0213-0227

    • Keywords

       

      Metre-wave radio telescope; Fourier synthesis; interference excision

    • Abstract

       

      A technique to detect man-made interference in the visibility data of the Mauritius Radio Telescope (MRT) has been developed. This technique is based on the understanding that the interference is generally ‘spiky’ in nature and has Fourier components beyond the maximum frequency which can arise from the radio sky and can therefore be identified. We take the sum of magnitudes of visibilities on all the baselines measured at a given time to improve detectability. This is then high-pass filtered to get a time series from which the contribution of the sky is removed. Interference is detected in the high-pass data using an iterative scheme. In each iteration, interference with amplitudes beyond a certain threshold is detected. These points are then removed from the original time series and the resulting data are high-pass filtered and the process repeated. We have also studied the statistics of the strength, numbers, time of occurrence and duration of the interference at the MRT. The statistics indicate that most often the interference excision can be carried out while post-integrating the visibilities by giving a zero weight to the interference points.

    • Author Affiliations

       

      S. Sachdev1 2 N. Udaya Shankar1 2

      1. Raman Research Institute, Sadashivanagar, Bangalore - 560 080, India
      2. Department of Physics, University of Mauritius, Reduit, Mauritius

    • Dates

       
      Published
      9 June 2001
      Manuscript received
      21 August 2001
      Accepted
      28 September 2001

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