无验潮模式水下地形测量的水位改正方法

A Water-level Correction Method for Underwater Topographic Measurement without Tidal Observation

采用无验潮模式进行水下地形测量时,定位信号不稳定会导致水位值出现异常。本文对起伏较小的沙滩区域单波束测深数据的水位值与水深值特征进行分析,研究水位值跳变的规律。对水位值与水深值进行相关性分析,采用傅里叶拟合的方法对异常段的水深数据进行拟合,根据水位值与水深值之间相关的特性,利用拟合函数对异常段的水位值进行改正。通过实例验证,该方法能够有效解决信号不稳定导致的水位异常,提高水下地形测量的高程精度。

The water-level value would be abnormal while the positioning signal was unstable in the underwater terrain measurement without tidal observation.This paper analyzed the characters of water-level value and water-depth value of single beam sounding data in the less undulating beach area,and studied the regular patterns of water-level shift.The correlation between water-level value and water-depth value was carried out,and fourier fitting method was used to fit the water-depth data of the abnormal section. According to the correlation between the water-level value and the water-depth value, the fitting function was used to calculate the water level of the abnormal section. The example proved that the method can effectively solve the water-level anomaly caused by signal instability and improve the elevation accuracy of underwater topographic survey.