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    • Dynamic displacement estimation and modal analysis of long-span bridges integrating multi-GNSS and acceleration measurements
    Authors: Yanbo, Niu; Jun, Li; Shukang, Zhou;  Advisor: -;  Co-Author: - (2023)

    Compared with acceleration-based modal analysis, displacement can provide a more reliable and robust identification result for output-only modal analysis of long-span bridges. However, the estimated displacements from acceleration records are frequently unavailable due to unrealistic drifts. Aiming at obtaining more accurate and stable results for determining the modal parameters, this study develops a multi-rate weighted data fusion approach for estimating displacement responses in dynamic monitoring of structures based on global navigation satellite system (GNSS) and acceleration measurements.
    • Enhancement of MF R-Mode ranging accuracy by exploiting measurement-based error mitigation techniques
    Authors: Rizzi, Filippo Giacomo; Hehenkamp, Niklas; Grundhöfer, Lars;  Advisor: -;  Co-Author: - (2022)

    Nowadays, the maritime sector strongly relies on global navigation satellite systems (GNSS) for the provision of position, navigation, and timing (PNT) information. The standard functionality of several ships’ bridge instruments depends on such information, which becomes critical to have a safe and reliable navigation. Nevertheless, the possibility of GNSS outages combined with unintentional and intentional interference to GNSS signals, which have been increasing over the last years, can severely threaten the nominal activity of the crew onboard of vessels. For these reasons, alternative position, navigation, and timing (APNT) systems become fundamental in order to provide operational continuity. R(anging)-Mode is a terrestrial alternative system to GNSS for the maritime domain. In ...