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Open Access

DSP-Enabled Radio Astronomy: Towards IIIZW35 Reconquest

  • Rodolphe Weber1Email author,
  • Cédric Viou2,
  • Andrée Coffre2,
  • Laurent Denis2,
  • Philippe Zarka3 and
  • Alain Lecacheux3
EURASIP Journal on Advances in Signal Processing20052005:149030

https://doi.org/10.1155/ASP.2005.2686

Received: 31 January 2004

Published: 21 September 2005

Abstract

In radio astronomy, the radio spectrum is used to detect weak emission from celestial sources. By spectral averaging, observation noise is reduced and weak sources can be detected. However, more and more observations are polluted by man-made radio frequency interferences (RFI). The impact of these RFIs on power spectral measurement ranges from total saturation to subtle distortions of the data. To some extent, elimination of artefacts can be achieved by blanking polluted channels in real time. With this aim in view, a complete real-time digital system has been implemented on a set of FPGA and DSP. The current functionalities of the digital system have high dynamic range of 70 dB, bandwidth selection facilities ranging from 875 kHz to 14 MHz, high spectral resolution through a polyphase filter bank with up to 8192 channels with 49 152 coefficients and real-time time-frequency blanking with a robust threshold detector. This receiver has been used to reobserve the IIIWZ35 astronomical source which has been scrambled by a strong satellite RFI for several years.

Keywords and phrases:

digital receiverfilter banksreal-time detectionradio astronomy

Authors’ Affiliations

(1)
Laboratoire d'Electronique, Signaux, Images, Polytech'Orleans, Université d'Orléans, Orléans Cedex, France
(2)
Station de Radioastronomie de Nançay, Observatoire de Paris, Nançay, France
(3)
LESIA, Observatoire de Paris, Meudon, France

Copyright

© Weber et al. 2005

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