基于等效声速剖面原理的测深误差改正方法

Bathymetric error correction method based on the principle of equivalent sound velocity profile

中文关键词:  多波束测深  声速误差  等效声速剖面

英文关键词:multibeam bathymetry  sound velocity error  equivalent speed sound  

中文摘要:

      水下地形测量中，水中声速误差的存在，造成在多波束测深数据中边缘波束区域测深误差显著增大，严重影响了多波束测深精度。对此，本文提出一种基于等效声速剖面原理的测深误差改正方法。针对相邻测线重叠区域的测深不符值序列，以声速误差、整体测深偏差、随机测深误差在等效声速剖面框架结构下构建函数模型，基于稳健估计原理对声速误差进行估计，进而实现测深偏差的整体改正。基于广东红海湾浅水测量数据和西太平洋深海测量数据的实验结果表明，本文所提方法可有效削弱声速导致的测深误差，改正后测深精度分别提升33.3%和32.6%。

英文摘要:

      In underwater topographic survey, the existence of sound velocity error in water causes a significant increase in the bathymetric error in the edge beam region of multibeam bathymetric data, which seriously affects the accuracy of multibeam bathymetry. In this paper, we propose a method to correct the bathymetric error based on the principle of equivalent sound velocity profile. Aiming at the sequence of bathymetric discrepancies in the overlapping area of adjacent survey lines, a function model is constructed under the framework structure of an equivalent sound velocity profile with sound velocity error, total bathymetric deviation and random bathymetric error, and the sound velocity error is estimated based on the principle of robust estimation, so as to realize the total correction of bathymetric deviation. The experimental results based on the shallow water measurement data in Guangdong Red Bay and the deep water measurement data in the western Pacific Ocean show that the method proposed in this paper can effectively attenuate the sounding error caused by the sound velocity, and the corrected bathymetric accuracy is improved by 33.3% and 32.6%, respectively.