New Concepts for Shipboard Sea State Estimation

Ulrik D. Nielsen, Mikkel Bjerregård, Roberto Galeazzi, Thor I. Fossen

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The wave buoy analogy is a tested means for shipboard sea state estimation. Basically, the estimation principle resembles that of a traditional wave rider buoy which relies, fundamentally, on transfer functions used to relate measured wave-induced responses and the unknown wave excitation. This paper addresses however a newly developed concept of the wave buoy analogy but the approach presented herein is, on the contrary, not relying exclusively on transfer functions. Instead, the method combines a signal-based part, estimating wave frequency, and a model-based part, estimating wave amplitude and phase, where only the model-based part depends on transfer functions whereas the signal-based part relies on the measured vessel response alone. Case studies in terms of hypothetical examples show that the method is capable to reconstruct fully the wave elevation process of a sinusoidal regular wave; which include estimation of the wave’s frequency, amplitude and phase. At this stage, the method is far from being a useful means in practical, real-situation applications but the method provides, indeed, a valuable step towards developing new approaches for shipboard sea state estimation.
Original languageEnglish
Title of host publicationProceedings of OCEANS '15
Number of pages10
Publication date2015
Article number7404386
Publication statusPublished - 2015
EventMTS/IEEE Oceans 2015 - Gaylord National Resort & Convention Center, Washington DC, United States
Duration: 19 Oct 201522 Oct 2015


ConferenceMTS/IEEE Oceans 2015
LocationGaylord National Resort & Convention Center
CountryUnited States
CityWashington DC
Internet address

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