基于Haar小波变换的重力场方向性适配区选取方法  

Gravity field directionality matching area selection method based on Haar wavelet transform

作　　者：徐辰龙 黄玉龙 王钊[1] 张嗣卿 任俊 张勇刚 XU Chenlong;HUANG Yulong;WANG Zhao;ZHANG Siqing;REN Jun;ZHANG Yonggang(College of Intelligent Systems Science and Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学智能科学与工程学院,哈尔滨150001

出　　处：《中国惯性技术学报》2024年第9期907-917,共11页Journal of Chinese Inertial Technology

基　　金：黑龙江省自然科学基金项目(ZD2023F002)。

摘　　要：水下重力场适配区的选取在重力匹配导航系统中起着至关重要的作用,传统适配区选取方法通常以重力场区域统计特性作为评价标准,而存在对方向适配性特征描述不准确的问题,在适配区中往往存在某一航向轨迹的匹配精度大幅下降的情况。针对此问题,提出一种基于Haar小波变换的方向性适配区选取方法,将小波变换后得到的高频信息图进行再组合,从而得到针对于任意指定航向的重力高频信息图。通过对某一海域的船载重力数据进行实验验证,基于所提方法可以根据当前航向选取出更具有针对性的适配区域,适配区内匹配率提升6.3%。所提出的方法不仅解决了现有适配区选取方法对方向适配性描述不准确的局限性,而且为潜航器选择以何种航向进入适配区起到了指导性作用。The selection of underwater gravity field adaptation zones plays a crucial role in gravity-matching navigation systems.Traditional methods for zone selection usually employ the statistical characteristics of the gravity field regions,but there is an issue of inaccurate description of directional adaptability features.Consequently,there is often a significant decrease in matching accuracy for certain trajectory directions within the adaptation zones.In this paper,a novel direction-based adaptation zone selection method is proposed based on Haar wavelet transform.By recombining the high-frequency information maps obtained from the wavelet transform,high-frequency gravity information maps tailored to any specified heading direction can be generated.Experimental validations are conducted on shipborne gravity data in a specific sea area.The proposed method is capable of selecting more targeted adaptation zones according to the current heading direction,resulting in higher matching accuracy with a 6.3%improvement in matching rate within the adaptation zones.The proposed method not only overcomes the limitations of existing zone selection methods in accurately describing directional adaptability,but also provides guidance for the selection of heading directions for underwater vehicles entering the adaptation zones.

关 键 词：重力场方向适配性 HAAR小波变换 权重函数 重力匹配导航 

分 类 号：U666.1[交通运输工程—船舶及航道工程]