Detection, excision and statistics of interference at the Mauritius radio telescope |
| |
| Authors: | S Sachdev N Udaya Shankar |
| |
| Institution: | (1) Raman Research Institute, Sadashivanagar, 560 080 Bangalore, India;(2) Department of Physics, University of Mauritius, Reduit, Mauritius |
| |
| 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. |
| |
| Keywords: | Metre-wave radio telescope Fourier synthesis interference excision |
| 本文献已被 SpringerLink 等数据库收录！ |
|
