摘要
针对条带状区域地磁空间特征变化平缓,在环境噪声扰动下会降低地磁定位匹配概率的问题,在二维小波增强模型的基础上,通过优化低频特征的调节系数和阈值函数,构建了地磁图小波增强算法模型。选取不同适配性的条带地磁图,开展了地磁匹配特征增强试验,研究了地磁图的小波算法与卷积算法增强有效性。试验结果表明,改进的Sobel算子和Laplace算子卷积后可以增强地磁特征,但处理后地磁图存在一定程度的畸变。小波阈值增强处理能够有效增强区域地磁特征,提升地磁图区域适配性指标。在适配性较弱样本区域,小波增强后匹配概率提升到了90%,验证了小波阈值增强算法对提升地磁图适配性的有效性。
For the geomagnetic spatial features of the strip region change gently,the geomagnetic matching probability will be reduced under the large environmental magnetic disturbance.The wavelet enhancement algorithm of geomagnetic map is constructed with the two-dimensional wavelet model,through optimizing the adjustment coefficient and threshold function of the low-frequency signal.In order to analyze the enhancement effect of wavelet algorithm and convolution algorithm,the geomagnetic spatial features enhancement test is carried out through selecting strip geomagnetic maps with different adaptability.The test results show that the geomagnetic features can be enhanced after the convolution with the improved Sobel operator and Laplace operator,but there is a certain degree of distortion in the processed geomagnetic map.The geomagnetic matching features is enhanced effectively with the wavelet threshold enhancement algorithm.The matching probability in the region with weak adaptability is increased to 90%after wavelet enhancement,which verifies the effectiveness of wavelet threshold enhancement algorithm in improving the adaptability of geomagnetic map.
作者
李鸣铎
杨华文
汪金花
刘暑明
孟庆港
郭立稳
LI Mingduo;YANG Huawen;WANG Jinhua;LIU Shuming;MENG Qinggang;GUO Liweng(School of Mineral Engineering,North China University of Science and Technology,Tangshan Hebei 063210,China;School of Elctrical Engineering,North China University of Science and Technology,Tangshan Hebei 063210,China)
出处
《传感技术学报》
CAS
CSCD
北大核心
2023年第10期1554-1562,共9页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金项目(42274056)
河北省自然科学基金项目(E2018209345)
河北省高等学校科学技术研究项目(QN2022117)
河北省研究生创新资助项目(CXZZBS2019127)。
关键词
地磁特征增强
小波增强算法
卷积增强算法
小波阈值
geomagnetic feature enhancement
wavelet enhancement algorithm
convolution enhancement algorithm
wavelet threshold