声速剖面精简的有效面积算法

An efficient simplification method of sound velocity profile using effective area algorithm

针对海洋大地基准网建立过程中,深海环境下水声定位声速数据量庞大、声线跟踪耗时长、效率低的问题,提出一种采用有效面积算法的声速剖面高效精简方法,通过计算声速曲线上相邻三点间的有效面积,设定比例系数搜索阈值,并将各数据点计算得到的面积值与阈值进行比对,来判断是否剔除数据点,实现声速剖面的高效精简。采用南海某海域的实测水声数据进行实验分析,结果表明,提出的方法对声速剖面的简化率可达到84%以上,声线跟踪效率提高6倍以上。并给出了方法中阈值系数的最优解,使定位误差控制在0.2 m以内,为声速剖面精简提供参考。

Aiming at the problems of large amount of sound velocity data,long time-consuming and low efficiency of sound ray tracing in deep-sea environment when establishing the ocean geodetic reference network,an efficient simplification method of sound velocity profile using effective area algorithm is proposed.By calculating the effective area between adjacent three points on the sound velocity curve,the search threshold of proportional coefficient is set,and the area value calculated by each data point is compared with the threshold to determine whether the data points are eliminated,so as to realize the efficient simplification of sound velocity profile.The experimental analysis is carried out by using the measured underwater acoustic data in part of the South China Sea.The results show that the proposed method can simplify the sound velocity profile by more than 84%,and the sound ray tracing efficiency is improved by more than 6 times.The optimal solution of the threshold coefficient in the method is given,so that the positioning error is controlled within 0.2 m,which provides a reference for the simplification of the sound velocity profile.