使用Savitzky—Golay滤波器改进的位场ISVD算法  

Improved Potential Field ISVD Algorithm Based on Savitzky—Golay Filter

作　　者：景小阳[1] 裴婧[2,3,4] 许航 解文博 Jing Xiaoyang;Pei Jing;Xu Hang;Xie Wenbo(College of Automotive,Engineering of Hunan Industry Polytechnic,Changsha Hunan 410208,China;School of Geosciences and Info-physics,Central South University,Changsha Hunan 410083,China;Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring of Ministry of Education,Central South University,Changsha Hunan 410083,China;Key Laboratory of Non-Ferrous Resources and Geological Hazard Detection,Central South University,Changsha Hunan 410083,China)

机构地区：[1]湖南工业职业技术学院汽车工程学院,湖南长沙410208 [2]中南大学地球科学与信息物理工程学院,湖南长沙410083 [3]中南大学有色金属成矿预测与地质环境监测教育部重点实验室,湖南长沙410083 [4]中南大学有色资源与地质灾害探查湖南省重点实验室,湖南长沙410000

出　　处：《工程地球物理学报》2019年第4期486-493,共8页Chinese Journal of Engineering Geophysics

基　　金：国家自然科学基金(编号:41227803)

摘　　要：结合空间域和频率域计算的ISVD(Integrated Second Vertical Derivative)位场垂向导数换算算法,相对单纯的空间域或频率域方法具有较高的稳定性,但是ISVD算法在高阶垂向导数换算过程中依然会在一定程度上受到噪声的干扰,随着换算阶数的增加,噪声干扰逐级增大。为了能够在压制噪声的同时很好地保持异常真实形态,将具有异常形态高保真特点Savitzky-Golay滤波器引入ISVD算法中,通过选择最优滤波参数,在各阶垂向导数的换算过程中能够对噪声进行逐级压制,同时维持了异常的真实信息。通过模型验证了Savitzky-Golay滤波对于ISVD算法的稳定性具有明显的改进效果。ISVD(integrated second vertical derivative)is a vertical derivative calculating algorithm which combines the space domain and frequency domain calculation.Compared to the space domain or frequency domain method,ISVD owns higher stability,butit still be disturbed by the noise to some extent in the process of higher vertical derivative conversion,and the noise disturbance will sequentially augment as the conversion order grows.In order to suppress the noise and keep the anomaly pattern real,the Savitzky—Golay filter is introduced into the ISVD algorithm.By selecting the optimal filter parameters,the noise can be suppressedsequentially,meanwhile,the real morphology of the anomaly can be kept well.The model test demonstrated that the Savitzky—Golay filter can improve the stability of ISVD algorithm explicitly.

关 键 词：位场 ISVD算法 垂向导数 Savitzky-Golay滤波器 最优滤波参数 

分 类 号：P631.3[天文地球—地质矿产勘探]