English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

This study reviews the design and signal processing of ship borne ultrasonicaltimeter wave measurements. The system combines a downward facing ultrasonicaltimeter to capture the sea surface elevation as a time series, and aninertial measurement unit to compensate for the ship's motion. The methodologyis cost-effective, open source, and adaptable to various ships and platforms.The system was installed on the barque Statsraad Lehmkuhl and recorded datacontinuously during the 20-month One Ocean Expedition. Results from 1-monthcrossing of the Tropical Atlantic are presented here. The one-dimensional wavespectrum and associated wave parameters are obtained from the sea surfaceelevation time series. The observed significant wave height agrees well withsatellite altimetry and a spectral wave model. The agreement betweenobservations and the spectral wave model is better for the mean wave periodthan the peak period. We perform Doppler shift corrections to improve waveperiod estimates by accounting for the speed of the ship relative to the waves.This correction enhances the accuracy of the mean period, but not the peakperiod. We suggest that the Doppler correction could be improved bycomplementing the data sources with directional wave measurements from a marineX-band radar.

Wave Measurements using Open Source Ship Mounted Ultrasonic Altimeter and Motion Correction System during the One Ocean Expedition