基于多尺度边缘约束的重力场信号的向下延拓  

Downward continuation of gravity signals based on the multiscale edge constraint

作　　者：宁津生[1] 汪海洪[2] 罗志才[1] 

机构地区：[1]教育部地球空间环境与大地测量重点实验室,武汉430079 [2]武汉大学测绘学院,武汉430079

出　　处：《地球物理学报》2005年第1期63-68,共6页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目 (4 0 0 740 0 5 );地球空间环境与大地测量教育部重点实验室开放研究基金项目 (0 3 0 4 12 )资助

摘　　要：利用多尺度边缘检测理论 ,研究改善重力场信号向下延拓稳定性的新方法 .简要介绍了小波多尺度边缘检测的基本原理 ,以EGM96重力场模型为例分析了地球重力场的多尺度边缘 .提出了基于多尺度边缘约束的向下延拓方法 ,并给出了模拟算例 .计算结果表明 ,利用多尺度边缘约束改善向下延拓的稳定性是可行的 ,在观测值信噪比较差的情况下该方法的效果尤为明显 .A new method to stabilize downward continuation of gravity signals is studied in this paper. The principle of multiscale edge detection by wavelets is presented firstly, and the multiscale edges of the earth's gravity field are analyzed with the EGM96 model as an example. Based on the constraint of the multiscale edge, a method for the downward continuation is proposed and a simulation example is given. The result indicates that it is feasible to enhance the stability of downward continuation using the multiscale edge as a constraint. This method has a better effect in the case when the signal-to-noise ratio of observations is low.

关 键 词：向下延拓 重力场 多尺度边缘 小波分析 

分 类 号：P223[天文地球—大地测量学与测量工程]