Abstract
The value of data gathered from R/P FLIP is enhanced if the motion of FLIP is described. At surface wave frequencies, FLIP's motion can be estimated from measurements of apparent acceleration and heading. This minimal set of measurements is often available in past data sets (e.g., from the Surface Wave Process Program, or SWAPP). In addition, the accelerometer data is often of superior quality, with less noise and greater dynamic range than other available data. The challenge is to partition the motion between true horizontal acceleration and tilt. For this, a quasi-linear dynamic model of FLIP's response to forcing by surface waves is developed, including added mass and drag terms. The model is refined on the basis of comparisons with more extensive motion data, gathered over a variety of wind and wave conditions: estimates of FLIP's tilt from measurements of the earth's magnetic flux vector, combined with gyro-compass heading, and horizontal velocity at 35 m estimated from surface-scanning Doppler sonars. The overall agreement between model estimates derived from accelerometer data and the others is good.
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