The beamformer and correlator for the Large European Array for Pulsars

R. Smits, C.G. Bassa, G.H. Janssen, R. Karuppusamy, Michael Kramer, K.J. Lee, K. Liu, James Mckee, D. Perrodin, Mark Purver, S. Sanidas, Benjamin Stappers, W.W. Zhu

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The Large European Array for Pulsars combines Europe’s largest radio telescopes to form a tied-array telescope that provides high signal-to-noise observations of millisecond pulsars (MSPs) with the objective
to increase the sensitivity of detecting low-frequency gravitational waves. As part of this endeavor we have developed a software correlator and beamformer which enables the formation of a tied-array beam
from the raw voltages from each of telescopes. We explain the concepts and techniques involved in the process of adding the raw voltages coherently.We further present the software processing pipeline that is specifically designed to deal with data from widely spaced, inhomogeneous radio telescopes and describe the steps involved in preparing, correlating and creating the tied-array beam. This includes polarization calibration, bandpass correction, frequency dependent phase correction, interference mitigation and
pulsar gating. A link is provided where the software can be obtained.
Original languageEnglish
Pages (from-to)66–74
JournalAstronomy and Computing
Early online date1 Apr 2017
Publication statusPublished - 2017


  • Gravitational waves
  • Techniques
  • interferometric
  • Pulsars
  • general


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