Patent ID: 8195395
Filing Date: 2012-06-05
Classification: B63B,G01C

Abstract:
1. A system for measuring spectra of surface ocean waves in near real-time comprising: a discus-shaped buoy floating at the ocean surface and moored to the seafloor, the discus-shaped buoy moving in response to wave action; buoy motion sensors, mounted to the buoy, for measuring vertical acceleration and angular rate of the buoy; a wave processing system, coupled to the buoy motion sensors, for converting vertical acceleration and angular rate into pitch and roll measurements of the buoy and generating wave spectral data from the pitch and roll measurements of the buoy, the wave processing system correcting vertical acceleration measurements to compensate for angular rate of the buoy; and a telecommunications relay system, coupled to the wave processing system, for transmitting wave spectral data to a shoreside processing system, the shoreside processing system processing the wave spectral data to remove noise from the wave spectral data and disseminating processed wave spectral data to users, wherein the shoreside processing system corrects noise for at least one frequency band, where: C11M(f(n)) is the acceleration spectral density for a frequency, f(n), where n presents the index of the frequency band; and The Noise Correction for each frequency band (NC(f(n))) is computed as follows: NC(f(n)) is then subtracted from each C11M(f(n)) and if a result of the subtraction is less than zero, then the result of the subtraction is set to zero.