Abstract The Ambiguity Dilution of Precision (ADOP) is a well-known scalar measure that can be used to infer the strength of the Global Navigation Satellite System (GNSS) model of the carrier phase ambiguities involved in precise relative GNSS positioning. Odijk and Teunissen (2008a) derived closed-form expressions for single-baseline GNSS models that allow verifying the factors affecting the ambiguity resolution as well as the probability of its correct resolution as integer values. However, this weighted-ionosphere ADOP closed form assumes that the standard deviation of the ionosphere delay is dependent on a function associated with the baseline length. This means that a baseline of the same length at different locations around the world and in different moments in time would have the same standard deviation, which in practice is not true. This becomes even worse in regions like Brazil, where the ionospheric anomalies are more intense and frequent, especially in periods of high solar activity. In this work, a new method for calculating the ionospheric delay standard deviation that considers the ionospheric scintillation S4 index is proposed to improve the closed-form ADOP performance. Experiments with a baseline of 280 m located in Presidente Prudente, Brazil (magnetic latitude of around −13°), were carried out. The results showed that in periods of both weak and strong ionospheric scintillation, the introduction of S4 into the ionospheric delay standard deviation was beneficial for ADOP. The average improvement of the ADOP closed form was of around 72% in the analyzed period of weak scintillation and of 35% in the period of strong scintillation. In addition, the results showed that in periods of strong scintillation, relative positioning accuracy is around 100 times worse, up to 30 m, when compared to periods of weak ionospheric scintillation.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Ionospheric scintillation impact on ambiguity resolution using ADOP in closed form


    Beteiligte:
    Silva, C.M. (Autor:in) / Alves, D.B.M. (Autor:in) / Souza, E.M. (Autor:in) / Setti Junior, P.T. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 64 , 4 ; 921-932


    Erscheinungsdatum :

    2019-05-17


    Format / Umfang :

    12 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






    Ionospheric Irregularities and Scintillation

    Wernik, A. W. / Secan, J. A. / Fremouw, E. J. et al. | British Library Conference Proceedings | 2003


    Ionospheric irregularities and scintillation

    Wernik, A.W. / Secan, J.A. / Fremouw, E.J. | Elsevier | 2002


    Ionospheric irregularities and scintillation

    Wernik, A.W. | Online Contents | 2003