Distributed correlators for interferometry in space

R.T. Rajan, Raj Rajan, Marinus Jan Bentum, A. Gunst, A.J. Boonstra

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    19 Citations (Scopus)


    New and interesting science drivers have triggered a renewed interest in radio astronomy at ultra long wavelengths. However, at longer wavelengths (beyond 10 meters) ground-based radio astronomy is severely limited by earths ionosphere, in addition to man-made interferences and solar flares. An unequivocal solution to the problem is to establish a space based observatory for ultra low frequency (0.3MHz-30MHz) observations. In ground-based radio astronomy, interferometers comprising of widely spaced antennas are employed to enhance the sensitivity and angular resolution of the observations. The signals received from the antennas are pre-processed, phase corrected independently and then cross correlated with one another using a centralized correlator to estimate the coherence function. However, a space based array, in addition to several other obstacles, presents new challenges for both communication and processing. In this paper, we discuss various conventional correlator architectures, such as XF, FX and HFX. In addition, the importance of a distributed correlator is emphasized for a space based array, in particular Frequency distributed correlator. We compute transmission, reception and processing requirements for both centralized and distributed architecture. Finally, as a demonstration, we present 2 projects were these signal processing estimates are applied.
    Original languageUndefined
    Title of host publication2013 IEEE Aerospace Conference
    Place of PublicationUSA
    Number of pages9
    ISBN (Print)978-1-4673-1812-9
    Publication statusPublished - 8 Mar 2013
    Event2013 IEEE Aerospace Conference - Big Sky Resort, Big Sky, United States
    Duration: 2 Mar 20139 Mar 2013

    Publication series

    PublisherIEEE Aerospace and Electronic Systems Society
    ISSN (Print)1095-323X


    Conference2013 IEEE Aerospace Conference
    Country/TerritoryUnited States
    CityBig Sky


    • EWI-23459
    • METIS-297706
    • IR-86305

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