Research On Improved Algorithm For Wave Direction Measurement Based On Wave Buoy

Ocean observation has a great influence on building a maritime power,and accurate wave direction information is especially important for ocean observation.Based on the measured wave data of the SZF wave buoy obtained by the national defense research project,aiming at the problem that the wave direction measured by wave buoy has a large error with the real wave direction in the actual sea test,this paper makes a profound study in the wave direction measurement algorithm by wave buoy,and completes several improvements to the traditional wave direction measurement algorithm.This paper studies the traditional algorithm and finds that the problems in the traditional algorithm can be divided into two categories: first,the traditional algorithm does not deal with the outliers after reading the data,and after the division of wave period,the traditional algorithm selects all wave data to participate in the calculation of wave direction,without considering the interference of small energy wave;second,the traditional algorithm only selects the instantaneous wave direction of the single point to calculate the direction of the single wave,and just calculates the dominant wave direction with the largest occurrence rate of wave direction,so the results of wave direction cannot accurately represent the real wave direction.In the first category of problems,for errors caused by outliers,the detection method based on K-means clustering algorithm and the correction method are proposed to eliminate the influence of outliers on the results of wave direction,and in view of the interference of small energy waves,the screening method of effective wave is proposed to obtain more accurate results of wave direction.The experimental results show that the improved algorithm can effectively improve the performance of the wave-direction measurement algorithm.The proposed methods are tested by the measured wave data,and the experimental results show that they can effectively improve the performance of the wave direction measurement algorithm.In the second category of problems,aiming at the inaccuracy of the direction of the single wave obtained by the single point,the improved method for fusing the instantaneous wave direction of multiple points is proposed.Then,aiming at the algorithm defect of calculating the dominant wave direction by the single occurrence rate of wave direction,the improved method for screening and the weighted average of the occurrence rate is proposed to calculate the dominant wave direction.The improved methods are tested by the measured wave data,and the experimental results show that they can effectively increase the accuracy of the wave direction measurement algorithm.Based on the traditional algorithm,this paper proposes an improved algorithm which can be used completely in engineering,the improved algorithm adds the processing method of outliers and the screening method of effective wave,and then it improves the calculation methods for the wave direction of single wave and the dominant wave direction.Finally,the performance of the improved algorithm is verified by a large number of the measured wave data.The experimental results show that,compared with the traditional algorithm,the improved algorithm can effectively improve the accuracy of the results of dominant wave direction,and the dominant wave direction can better represent the real wave direction,the improved algorithm can have a good applicability in different sea condition and provide more accurate wave direction for subsequent scientific research projects.