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A wideband multirate FFT spectrometer with highly uniform response

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Abstract

An integrating spectrometer based on a two-stage polyphase digital filter bank (PDFB) algorithm is described. The first PDFB operates on a time multiplexed wideband signal, with a bandwidth up to 1 GHz. The second PDFB is performed in parallel over couples of overlapping channels from the first filterbank. The design automatically deletes the unused portions of the first filterbank channels, providing a seamless, uniform channelization of the input band. The design has been implemented and tested on the VLBI DBBC platform, using a single Xilinx XC5VLX220 FPGA.

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Notes

  1. It is relatively easy to process the two real signals in a single complex FFT. For simplicity we have not introduced the possibility in our design.

References

  1. Comoretto, G., Tuccari, G.: Reference design for the Digital BBC Architecture. Arcetri internal report 2/2008 (2008). http://www.arcetri.astro.it/pubblicazioni/Reports/08/testi/2_2008.pdf

  2. Harris, F.J.: Multirate Signal Processing for Communication Systems, p. 228. Prentice Hall (2008)

  3. Tuccari, G.: DBBC—a Wide Band Digital Base Band Converter. In: IVS 2004 General Meeting Proceedings, p. 234 (2004). ftp://ivscc.gsfc.nasa.gov/pub/general-meeting/2004/pdf/tuccari3.pdf

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Authors and Affiliations

  1. INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, Firenze, Italy

    Giovanni Comoretto

  2. INAF-Osservatorio Astronomico di Cagliari, Loc. Poggio dei Pini, Strada 54, Capoterra (CA), Italy

    Andrea Melis

  3. INAF-Istituto di Radioastronomia, Noto VLBI Station, Contrada Renna Bassa, 96017, Noto (SR), Italy

    Gino Tuccari

Authors
  1. Giovanni Comoretto
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  2. Andrea Melis
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  3. Gino Tuccari
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Correspondence to Giovanni Comoretto.

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Comoretto, G., Melis, A. & Tuccari, G. A wideband multirate FFT spectrometer with highly uniform response. Exp Astron 31, 59–68 (2011). https://doi.org/10.1007/s10686-011-9230-9

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  • DOI: https://doi.org/10.1007/s10686-011-9230-9

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