MEMS motion sensor based wave measurement method

Abstract

The invention discloses an MEMS (micro-electro-mechanical system) motion sensor based wave measurement method. Specifically, an MEMS motion sensor is mounted in a buoy to acquire various motion parameters of the buoy, an ocean wave directional spectrum is obtained according to the motion parameters, and then wave parameters can be calculated. The wave measurement method consists of: acquiring the buoy motion parameters, i.e. acquiring the roll angle phi, pitch angle theta, yaw angle psi and three-dimensional motion speed of the buoy in an ECEF coordinate system with the MEMS motion sensor in the buoy; combining the buoy motion parameters and calculating an original wave directional spectrum, i.e. constructing 7 combinations according to the acquired 12 buoy motion parameters to calculate the original wave directional spectrum; calculating the wave directional spectrum by coefficient weighting, i.e. performing coefficient weighting on the original wave directional spectrum of the 7 combinations so as to obtain the sea wave directional spectrum; and calculating the wave height, wave period, wave direction and other ocean wave parameter information. The wave measurement method provided by the invention is simple, and has stable and reliable wave measurement accuracy, thus having very broad application prospect.

Description

technical field [0001] The invention relates to ocean wave measurement technology, in particular to a method for measuring ocean waves using a MEMS motion sensor. Background technique [0002] Ocean wave data is one of the most important elements of marine environment observation. There is a huge demand for wave measuring instruments in many fields, such as wave operational observation and forecasting, marine disaster emergency observation, ocean energy resource investigation, and long-term marine climatology research. [0003] The wave buoy has very good wave-following characteristics, and it is currently one of the most widely used ocean wave measuring instruments. The traditional wave buoy is to install an acceleration sensor inside, and calculate the wave parameters according to the motion acceleration of the measured buoy. The measurement of this type of buoy only depends on the motion parameters such as acceleration, and the measurement accuracy is directly determined...

AI Technical Summary

Problems solved by technology

The measurement of this type of buoy only depends on the motion parameters such as acceleration, and the measurement accuracy is directly determined by the noise level of the acceleration sensor. When the measurement error and measurement noise of the acceleration sensor suddenly increase due to some external factors, the measurement accuracy of the buoy will will suddenly decrease

Therefore, the measurement accuracy of wave buoys that only use motion parameters such as acceleration has poor ability to resist the influence of external factors, and the stability and reliability of measurement accuracy are also poor.

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