Maximum likelihood multipath estimation in comparison with conventional delay lock loops

Michael Lentmaier, Bernhard Krach

    Research output: Contribution to conferencePaper, not in proceedingpeer-review

    15 Citations (SciVal)

    Abstract

    The implementation of the maximum likelihood estimator
    for the time-delay estimation problem is practically
    intractable for navigation signals due to its complexity,
    especially when due to multipath reception several
    superimposed replica are taken into account. Recently it
    has been shown that signal compression techniques can
    overcome this problem, as the maximum likelihood
    estimator can be formulated efficiently upon a reduced
    data set of much smaller size compared to the original
    data, where the reduced data set forms a sufficient statistic
    for the estimated signal parameters. This paper focuses on
    the formulation of such a signal compression based
    estimator. Furthermore the integration of the estimator
    into navigation receivers is addressed, in particular by
    considering the delay lock loop architecture that is
    employed within conventional navigation receivers. A
    novel approach for integrating the efficient maximum
    likelihood estimator into a generic tracking loop is
    proposed. The performance of the proposed method is
    assessed by computer simulations. The results show that
    the conventional delay lock loop is outperformed with respect to noise performance as well as with respect to the
    multipath bias.
    Original languageEnglish
    Publication statusPublished - 2006
    EventInternational Technical Meeting of the Institute of Navigation Satellite Division, (ION GNSS), 2006 - Forth Worth, TX, United States
    Duration: 2006 Sep 252006 Sep 26

    Conference

    ConferenceInternational Technical Meeting of the Institute of Navigation Satellite Division, (ION GNSS), 2006
    Country/TerritoryUnited States
    CityForth Worth, TX
    Period2006/09/252006/09/26

    Subject classification (UKÄ)

    • Electrical Engineering, Electronic Engineering, Information Engineering

    Keywords

    • GNSS
    • multipath mitigation
    • delay lock loop
    • DLL

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