Browsing NTNU Open by Author "Wickert, Jens"

Now showing items 1-7 of 7

    • First Evidence of Mesoscale Ocean Eddies Signature in GNSS Reflectometry Measurements 

      Hoseini, Mostafa; Asgarimehr, Milad; Zavorotny, valery; Nahavandchi, Hossein; Ruf, chris; Wickert, Jens (Journal article; Peer reviewed, 2020)
      Feasibility of sensing mesoscale ocean eddies using spaceborne Global Navigation Satellite Systems-Reflectometry (GNSS-R) measurements is demonstrated for the first time. Measurements of Cyclone GNSS (CYGNSS) satellite ...

    • On the Response of Polarimetric GNSS-Reflectometry to Sea Surface Roughness 

      Hoseini, Mostafa; Semmling, Maximilian; Nahavandchi, Hossein; Rennspiess, Erik; Ramatschi, Markus; Haas, Rüdiger; Strandberg, Joakim; Wickert, Jens (Journal article; Peer reviewed, 2021)
      Reflectometry of Global Navigation Satellite Systems (GNSS) signals from the ocean surface has provided a new source of observations to study the ocean-atmosphere interaction. We investigate the sensitivity and performance ...

    • A Performance Assessment of Polarimetric GNSS-R Sea Level Monitoring in the Presence of Sea Surface Roughness 

      Rajabi, Mahmoud; Hoseini, Mostafa; Nahavandchi, Hossein; Semmling, Maximilian; Ramaschi, Markus; Goli, Mehdi; Hass, R ̈udiger; Wickert, Jens (Peer reviewed; Journal article, 2021)
      Monitoring coastal sea level has gained a large socioeconomic and environmental significance. Ground-based Global Navigation Satellite System Reflectometry (GNSS-R) offers various geophysical parameters including sea surface ...

    • Polarimetric GNSS-R Sea Level Monitoring using I/Q Interference Patterns at Different Antenna Configurations and Carrier Frequencies 

      Rajabi, Mahmoud; Hoseini, Mostafa; Nahavandchi, Hossein; Semmling, Maximillian; Ramatschi, Markus; Goli, Mehdi; Haas, Rudiger; Wickert, Jens (Peer reviewed; Journal article, 2021)
      Coastal sea level variation as an indicator of climate change is extremely important due to its large socioeconomic and environmental impacts. The ground-based global navigation satellite system (GNSS)-reflectometry (GNSS-R) ...

    • Remote Sensing of Precipitation Using Reflected GNSS Signals: Response Analysis of Polarimetric Observations 

      Asgarimehr, Milad; Hoseini, Mostafa; Semmling, Maximilian; Ramatschi, Markus; Camps, Adriano; Nahavandchi, Hossein; Haas, Rüdiger; Wickert, Jens (Journal article; Peer reviewed, 2021)
      For the first time, rain effects on the polarimetric observations of the global navigation satellite system reflectometry (GNSS-R) are investigated. The physical feasibility of tracking the modifications in the surface ...

    • Tidal harmonics retrieval using GNSS-R dual-frequency complex observations 

      Rajabi, Mahmoud; Hoseini, Mostafa; Nahavandchi, Hossein; Asgarimehr, Milad; Semmling, Maximilian; Ramatschi, Markus; Goli, Mehdi; Wickert, Jens (Peer reviewed; Journal article, 2023)
      Tidal analysis and methods for estimation and prediction of ocean tidal constitutes are essential in a large area of scientific disciplines, for example, navigation, onshore and offshore engineering, and production of green ...

    • Towards a zero-difference approach for homogenizing GNSS tropospheric products 

      Hoseini, Mostafa; Alshawaf, Fadwa; Nahavandchi, Hossein; Dick, Galina; Wickert, Jens (Peer reviewed; Journal article, 2020)
      A data homogenization method based on singular spectrum analysis (SSA) was developed and tested on real and simulated datasets. The method identifies abrupt changes in the atmospheric time series derived from Global ...