基于自适应格网数字水深模型的水下地形匹配定位算法

发布时间：2018-05-05 09:29

本文选题：自适应网格 + 数字水深模型　；参考：《中国惯性技术学报》2017年04期

【摘要】：为了解决当前的水下地形匹配定位算法未考虑格网大小随海底地形变化而自动调整的问题,提出了一种基于自适应格网数字水深模型的水下地形匹配定位算法。首先,引入基于四叉树的自适应格网模型,改进其局部格网的相似性评估指标与构网约束方法;然后,设计匹配区的确定及待匹配航迹的选取策略,给出待匹配航迹的水深值的计算方法,构建出目标匹配定位的地形相关组合算子。实验结果表明:提出的算法相比于基于等距离的规则格网模型的算法有以下优势:1)在地形特征丰富区域的定位精度明显提高;2)可以避免出现地形特征越明显匹配定位精度越低的情况;3)能一定程度地克服水深系统误差对定位精度的影响。
[Abstract]:In order to solve the problem that the current underwater terrain matching algorithm does not take the grid size into account and adjusts automatically with the change of submarine topography, an underwater terrain matching localization algorithm based on adaptive grid digital depth model is proposed. Firstly, the adaptive grid model based on quadtree is introduced to improve the similarity evaluation index of local grid and the constraint method of constructing network, and then, the strategy of determining matching area and selecting track to be matched is designed. The method of calculating the depth of track to be matched is given, and the terrain correlation combination operator for target matching location is constructed. The experimental results show that the proposed algorithm has the following advantages over the algorithm based on the regular grid model based on equal distance: (1) the accuracy of location in the region with rich terrain features is significantly improved. (2) the more obvious matching of terrain features can be avoided, the more obvious matching can be avoided. The lower the positioning precision is, the better the influence of the water depth system error on the positioning accuracy can be overcome.
【作者单位】：海军大连舰艇学院海洋测绘系;海军大连舰艇学院海洋测绘工程军队重点实验室;
【基金】：国家自然科学基金(41471380);国家自然科学基金(41601498)
【分类号】：P229

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