基于MEMS加速度计的波高测量装置

Wave Height Measurement Device Based on MEMS Accelerometer

利用加速度计浮标对海洋特定的参数波高进行监测。加速度计浮标运用三轴加速度计、陀螺仪、强磁场计以及电磁罗盘模块作为核心电路,利用惯性导航原理,采用四元素法进行坐标转换,并用低通滤波算法对采集信号进行处理,将滤波后的信号值进行二次积分可获取轴向位移,其中Z向位移用来计算波高,同时运用倾角测量原理计算上跨零点处浮标与水平面倾角,并用电子罗盘进行校正,以此来判断波向的方法。使用该波高测量装置对一系列波浪进行测量,并与电容波高传感器进行对比,实验结果表明:运用加速度计浮标测得竖直方向位移曲线,与电容式波高传感器实测曲线相比一致性较好,针对测量结果进行对比发现频域内分析方法误差更小。因此基于陀螺仪和加速度计的波浪观测装置能够满足波浪实验测量需求。

Using the accelerometer buoy the ocean wave height were specific parameters monitoring.The accelerometer buoy adopts the three-axis accelerometer,gyroscope,strong magnetic field meter and electromagnetic compass module as the core circuit,adopts the inertial navigation principle,adopts the four-element method for coordinate transformation,and processes the collected signal with the low-pass filter algorithm.The filtered signal value can be integrated twice to obtain the axial displacement,among which the z-direction displacement can be used to calculate the wave height.Meanwhile,the dip angle measurement principle is used to calculate the dip angle of the buoy and the horizontal plane at the top crossing point,and the electronic compass is used to correct,so as to determine the method of wave direction.The wave height measurement device was used to measure a series of waves,and compared with the capacitive wave height sensor,the experimental results showed that the vertical displacement curve measured by the accelerometer buoy was better consistent with the measured curve measured by the capacitive wave height sensor.So based on the waves of the gyroscope and accelerometer observation device meet the demand of wave measurement.