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-Since year , the National Data Buoy Center NDBC has been developing, testing, evaluating and refining a pitch-roll- heave directional wave measuring system.It consists of a.-meter-diameter isomer foam flotation ring in the center of which is placed a cylindrical battery and instrument compartment.AMicroStrain® DM-GX motion sensor, located at the center of flotation, pro- vides a stream of nine measurements subsampled at a rate of , samples in , seconds.Thebuoy transmits standard NDBC direc- tional wave spectral information each hour via an Iridium® satellite modem after computing directional wave spectra from triaxial components of earth magnetic flux density and angular rate, and along-mast acceleration.Additionally, high-resolution data are stored onboard the station for post-deployment analysis.Testing has been done in seven steps.First,best m
pitch-roll, directional, a-meter-diameter, cylindrical, instrument compartmenta, compartmenta microstrain®, measurements, transmits, information, iridium® satellite, components, along-mast high-resolution, post-deployment analysistesting, analysistesting stepsfirst, measurement, electronic processor,
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