局部重力异常的球面小波多尺度信号分析  

Spherical wavelet multiscale signal analysis of regional gravity anomaly

作　　者：蔺文奇 文汉江[1,2] 刘焕玲 董杰[1,2] 于宏旭 LIN Wenqi;WEN Hanjiang;LIU Huanling;DONG Jie;YU Hongxu(Chinese Academy of Surveying and Mapping,Beijing 100036,China;Key Laboratory of Surveying and Mapping Science and Geospatia Information Technology,Ministry of Natural Resources,Beijing 100036,China)

机构地区：[1]中国测绘科学研究院,北京100036 [2]自然资源部测绘科学与地球空间信息技术重点实验室,北京100036

出　　处：《测绘科学》2022年第3期9-15,共7页Science of Surveying and Mapping

基　　金：高分辨率对地观测系统重大专项(42-Y20A09-9001-17/18);DAAD战略合作伙伴与专题研究合作网络项目(57421148);中国测绘科学研究院基本科研业务费项目(AR1922,AR2016);武汉大学地球空间环境与大地测量教育部重点实验室开放基金项目(18-01-05)。

摘　　要：针对局部重力场信号的多尺度分析问题,利用EGM2008重力场模型前720阶和2190阶系数计算菲律宾南部地区(120°~130°E,0°~12°N)的重力异常,基于DOG球面小波建立球面小波模型并进行多尺度分析。结果显示,球面小波分解的能力与数据的分辨率有关,分辨率较高的重力数据在小尺度具有更多的细节特征;经叠加得到的重力异常球面小波模型值可以很好地还原重力异常信号。该方法将有望用于多源数据融合反演地球重力场、高精度海底地形反演等方面的研究中。Aiming at the multiscale analysis of regional gravity field signals,We used the first 720 degrees and 2190degrees coefficients of EGM2008gravity field model to calculate gravity anomaly in the southern Philippines(120°~130°E,0°~12°N),we also used the difference of Gauss(DOG)spherical wavelet to establish spherical wavelet model for gravity anomaly,and made the multiscale analysis.The results showed that the ability of spherical wavelet decomposition was related to the resolution of data,and the gravity data with higher resolution had more detailed characteristics at small scale;The spherical wavelet gravity anomaly model value obtained model value by superposition could restore gravity anomaly signal well.This method was expected to be used in the research of inversion Earth gravity field by multisource data fusion and high precision sea-floor topography inversion.

关 键 词：球面小波 重力异常 EGM2008重力场模型 多尺度分析 

分 类 号：P228[天文地球—大地测量学与测量工程]