关键词: 数字水深模型, 不确定度合成方法, 地形描述不确定度, 网格双线性法, 深度保证率

Abstract:

Aiming at the problem that digital depth model (DDM) for non-navigation can't be directly applied to navigation, a method of the transformation from DDM for non-navigation to navigation based on the fitting surface of depth uncertainty is proposed. Uncertainty propagation of modeling point of DDM for non-navigation is calculated by the original depth uncertainty based on uncertainty synthetic method. Terrain representation uncertainty of DDM for non-navigation is estimated based on test point method, and then comprehensive uncertainty of modeling point is acquired. The uncertainty fitting surface is constructed based on grid bilinear method by comprehensive uncertainty of modeling points of DDM for non-navigation, and depth uncertainty at any point in the DDM is estimated to improve the probability of an adequate depth of DDM for non-navigation. The experimental results demonstrate that the proposed method is feasible and can greatly improve probability of an adequate depth of DDM for non-navigation, so as to meet the requirements of the safety of ship navigation.

Key words: digital depth model, terrain representation uncertainty, uncertainty synthetic method, grid bilinear method, probability of an adequate depth