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    Item type:Publication, Access status: without files ,
    A six-port-based tracking system for automated landing of fixed-wing UAVs
    (IEEE, 2024-08-20)
    Hübner, Kai Christian
    ;
    Tegowski, Bartosz
    ;
    Kölpin, Alexander
    This contribution presents a measurement system for tracking fixed-wing unmanned aerial vehicles (UAV) during gear-less landing on automated, mobile, and rail-based runways. It relies on a transmitter located in the UAV and six-port based angle-of-Arrival measurements. A demonstrator operating in the 2 4-G H z Industrial, Scientific and Medical (ISM) band is designed, manufactured, and characterized. It guarantees a precision better than one degree, and up to 0.02 degree in optimal conditions as well as real-Time capabilities with 500 samples per second. A real-world proof-of-concept experiment validates the approach.
    Publicationtype: Conference Paper
      39
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    Item type:Publication, Access status: without files ,
    Nonlinear distortion effects of vibration-sensing interferometric radar systems due to self-RCS
    (IEEE, 2024-08-20)
    Tegowski, Bartosz
    ;
    Kölpin, Alexander
    This contribution investigates the accuracy of interferometric continuous-wave radars depending on their own radar cross section (self-RCS) in the context of mechanical vibration analysis. The self-RCS is determined by the overall physical entity of the system including the radar antenna as well as the housing. The backscattering by the radar re-illuminates the target, which ultimately leads to a nonlinear dependency between its motion and the measured phase. This nonlinear distortion is studied in theory and validated by measurements demonstrating phenomena such as harmonic generation and intermodulation, which depend on the self-RCS.
    Publicationtype: Conference Paper
      35