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  • Research Article
  • Open Access

DSP-Enabled Radio Astronomy: Towards IIIZW35 Reconquest

  • 1Email author,
  • 2,
  • 2,
  • 2,
  • 3 and
  • 3
EURASIP Journal on Advances in Signal Processing20052005:149030

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

  • Received: 31 January 2004
  • Published:

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 receiver
  • filter banks
  • real-time detection
  • radio astronomy

Authors’ Affiliations

(1)
Laboratoire d'Electronique, Signaux, Images, Polytech'Orleans, Université d'Orléans, 12 rue de Blois, BP 6744, Orléans Cedex, 2 45067, France
(2)
Station de Radioastronomie de Nançay, Observatoire de Paris, CNRS No. 704, Nançay, 18330, France
(3)
LESIA, Observatoire de Paris, CNRS, 5 Place Jules Janssen, Meudon, 92195, France

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