直线段的重力场匹配水下导航新方法

New gravity matching algorithm for underwater navigation based on straight-line

针对当前重力场匹配算法在实时性和可用性上存在的不足,考虑到潜艇水下航行轨迹在短时间内为一条直线的特点,提出了一种基于直线段方式进行重力图形匹配的新方法。该方法通过以初始概略点位为中心的旋转搜索,选取满足在一条直线段上与测量点的重力误差在一定范围内的点集作为最终匹配点,并以实测海区数据为基础进行了实验验证。实验结果表明,这种基于直线段的重力场匹配新方法可以在一定程度上克服由于重力测量精度不够带来的匹配失效问题,能够获得很好的匹配效果,同时也解决了当前其它匹配算法在实时性上存在的突出问题。匹配算法在实时性和可用性上具有一定创新。

A correlative matching algorithm was presented to improve the real-time and usability of gravity matching algorithm considering that the navigation route of submarine was a straight-line in short time. The algorithm searched around the initial point and chose the points whose gravity value was local to the surveying points as the final matching position. The experiments were carried out using this algorithm based on the real coastal gravity data. The results show that this algorithm can improve the results of gravity pattern matching, and overcome the problem of matching failure caused by gravity data imprecision. In addition, it also solves the serious problem of real-time in other matching algorithm.