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2 results

  • 2 - Environmental Conditions

  • Bernard Molin, École Centrale de Marseille and NTNU: Norwegian University of Science and Technology
  • Book:
    Offshore Structure Hydrodynamics
    Published online:
    31 January 2023
    Print publication:
    05 January 2023, pp 19-48

  • Summary

    The concepts of sea state and of short-term and long-term statistics are introduced. Wave by wave and spectral analyses are described; definitions are given of wave spectrum, significant wave height, mean wave period, and narrowness parameter. Theoretical distributions of wave heights (the Rayleigh law) are derived. The concept of return period is introduced. The other environmental parameters considered are the wind, the current, the internal waves, and the marine growth. The different definitions of mean wind velocity are explained. Typical wind profiles and wind spectra are presented.

  • Real-time Processing of Reflected GNSS Signals for Remote Sensing: System and Experiments

  • Weiqiang Li, Dongkai Yang, Bo Zhang, Mingli Li, Qishan Zhang
  • Journal:
    The Journal of Navigation / Volume 64 / Issue S1 / November 2011
    Published online by Cambridge University Press:
    14 October 2011, pp. S127-S140
    Print publication:
    November 2011

  • The GNSS-R technique brings out the need for signal receiver systems to process both direct and reflected GNSS signals. This paper describes the architecture of a new GNSS-R receiver system (GRrSv.2) that features enhanced capabilities for remote sensing based on reflected Global Positioning System (GPS) signals. Signal processing issues including DDM calculation, Carrier and Code Generation and DDM Synchronization are presented. Aircraft- and land-based verification experiments for ocean winds, ocean Significant Wave Heights (SWH) and soil moisture have been performed and some primary results are presented in this paper.