Maritime activity in the Arctic is increasing, triggering a need for better communication infrastructure. With limited terrestrial infrastructure available, satellite services are essential for distributing maritime safety information, such as ice and weather information, navigational augmentation data, and basic communication to vessels operating in the vulnerable Arctic environment. The VHF Data Exchange System (VDES) is a new communication system for ships, extending the successful Automatic Identification System (AIS). VDES has a satellite component (VDE-SAT) which will extend the terrestrial-based coastal coverage to global coverage. Measurements and analysis of the in-orbit radio environment are needed to improve the robustness and reliability of the VDE-SAT system. Knowledge and understanding of the in-orbit interference will allow the development of appropriate interference mitigation techniques. This paper presents preliminary in-orbit measurement results and analysis of the radio environment in the VDE-SAT frequencies in the 157.2875 - 157.3375 MHz band. The measurements were carried out using the VDE-SAT payload on-board the Norwegian NorSat-2 satellite. We analyze the time-frequency characteristics of interference by studying two types of statistics on the raw in-phase and quadrature samples: the general temporal dynamic of the interference, characterised using the Local Mean Envelope (LME) for different averaging window lengths; and the interference duration and periodicity. Both these views play a role when choosing suitable countermeasures to get robust communications. The coefficient of variation on the LME is used to study the dispersion. Data from two measurement campaigns over the Arctic area from May 2021 are analysed using these two methods, and the initial results are presented.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    In-orbit Interference Measurements and Analysis in the VDES-band with the NorSat-2 Satellite


    Beteiligte:
    Quintana-Diaz, Gara (Autor:in) / Birkeland, Roger (Autor:in) / Loge, Lars (Autor:in) / Andersen, Even (Autor:in) / Bolstad, Anton (Autor:in) / Ekman, Torbjorn (Autor:in)


    Erscheinungsdatum :

    05.03.2022


    Format / Umfang :

    6482361 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    VDES-A type machine system

    LIU BO / AI JIANGFU / HUANG DEYONG et al. | Europäisches Patentamt | 2021

    Freier Zugriff

    Maritime service system based on vdes

    JI YONGQING / FAN XIA / ZHANG XIAODUO et al. | Europäisches Patentamt | 2024

    Freier Zugriff

    SciPPPer Kommunikation (VDES) : Abschluss-Bericht

    Zimmermann, J. / Weatherdock AG | TIBKAT | 2022

    Freier Zugriff


    FIELD TRIALS OF THE VHF DATA EXCHANGE SYSTEM (VDES) SATELLITE DOWNLINK COMPONENT

    Gómez, I. / Valdés, F. / Ares, B. et al. | TIBKAT | 2019