基于PAADCP的海流流速的误差分析及校正方法

A method of error analysis and correction of ocean current velocity based on phased array acoustic Doppler current profiler

为了更加合理、有效地利用海流测速数据,必须进行误差分解和校正。通过分析相控阵声学多普勒海流剖面仪(PAADCP)测试海流流速的原理,提出了海试数据粗差区别与动态校正的算法,采用小波多尺度分析方法,降低了系统误差和随机误差,建立了海流流速的误差分析与校正方法。利用海试实测的垂向流速数据,分析了一般情况下的海流流速的误差,得到垂向流速的均值±0.02 m/s,误差精确度小于0.23 m/s,验证了方法的有效性及合理性。所得算法和方法对于海流测速数据的实时处理和后处理具有实用价值。

In order to use current velocity data more reasonably and effectively, error decomposition and correction must be disposed first. Based on the analysis of the theory of phased array acoustic Doppler current profiler （PAADCP）, a method to distinguish the gross errors and to correct the gross errors is introduced, by the method of multi-scaling wavelet analysis, we reduced the systematical errors and the random errors, a method of errors analysis and correction of ocean current velocity is established. Through analysis of the original ocean vertical velocity data and the errors, we got that the average value of vertical velocity ranges from -0.02 to 0.02 m/s, and the accuracy is less than 0.23 m/s, which shows that the method is effective and reasonable. The obtained algorithms and methods for real-time processing and post processing the current data have a practical value.