Abstract
AbstractThe observation of ocean wave parameters is necessary to improve forecasts of ocean wave conditions. In this paper, we investigate the viability of using a single GPS receiver to measure ocean-surface waves, and present a method to enhance the accuracy of the estimated wave parameters. The application of high-pass filtering to GPS data in conjunction with directional wave spectral theory is a core concept in this article. Laboratory experiments were conducted to test the viability and accuracy measurements of wave parameters made by a single GPS receiver buoy. These tests identified an error of less than 1% for the rotational arm measurement (wave height) and an error of 1% in verifications of the wave direction and wave period, and showed a 0.488 s bias; this is sufficiently accurate for many specific purposes. These results are based on the best cut-off frequency value derived in this study. A moored-sea GPS buoy on the Taiwanese coast was used to estimate the GPS-derived wave parameters. Our results indicate that data from a single GPS receiver, processed with the presented method to reduce the error of the estimated parameters, can provide measurements of ocean surface wave to reasonable accuracy.
Highlights
Accurate forecasts of wave conditions are of the utmost importance to everyone living, working, or traveling on or near the ocean
Our results indicate that data from a single GPS receiver, processed with the presented method to reduce the error of the estimated parameters, can provide measurements of ocean surface wave to reasonable accuracy
We applied a methodology to derive ocean wave parameters from GPS buoy data, and presented a method to reduce the error in these estimated wave parameters
Summary
Accurate forecasts of wave conditions are of the utmost importance to everyone living, working, or traveling on or near the ocean. We use the method first proposed by Iwanaka et al (2005) with the main focus being to present a procedure for selecting a reasonable cut-off frequency based on root mean square (RMS) differences in GPS height. The goal of this procedure is to allow measurement of ocean-surface waves to proceed from the processing of data from a single GPS receiver, removing distance constraints between the GPS buoy and its base station and allowing GPS buoy placement even in the middle of the ocean. We use an algorithm that is based on the assumption that errors in GPS data are largely removed by a high-pass filter
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