| 从航磁资料延拓出海面磁场 |
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| 引用本文： | 徐世浙,王瑞,周坚鑫,肖鹏飞,陈生昌.从航磁资料延拓出海面磁场[J].海洋学报,2007,29(6):53-57. |
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| 作者姓名： | 徐世浙 王瑞 周坚鑫 肖鹏飞 陈生昌 |
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| 作者单位： | 1.浙江大学, 地球科学系, 浙江, 杭州, 310027 |
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| 基金项目： | 教育部博士点基金资助项目(20050335090)，自然科学基金资助项目(40644022) |
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| 摘 要： | 因延拓深度有限,现有的位场向下延拓方法不能从航磁资料向下延拓出海面的磁场.位场大深度向下延拓方法——迭代法,可以从航磁资料向下延拓出海面的磁场,得出与航磁同比例尺的海面磁力图,可大大提高海洋磁测成果的综合利用率.介绍了迭代法位场延拓原理.用迭代法对实际资料进行了处理,讨论了误差产生的原因.对比了迭代法与快速傅立叶变换法(FFT)在位场向下延拓中的效果,迭代法显著优于FFT法.
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| 关 键 词： | 航磁 海面磁场 位场向下延拓 迭代法 快速傅立叶变换法 |
| 文章编号： | 0253-4193（2007）06-0053-05 |
| 收稿时间： | 2007-02-02 |
| 修稿时间： | 2007-05-08 |
To continue aeromagnetic data to the sea level |
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| XU Shi-zhe,WANG Rui,ZHOU Kian-xin,XIAO Peng-fei and CHEN Sheng-chang.To continue aeromagnetic data to the sea level[J].Acta Oceanologica Sinica (in Chinese),2007,29(6):53-57. |
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| Authors: | XU Shi-zhe WANG Rui ZHOU Kian-xin XIAO Peng-fei and CHEN Sheng-chang |
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| Affiliation: | 1.Department of Earth Sciences, Zhejiang University, Hangzhou 310027 China2.Department of Navigation Guarantee, Navy Headquarters, Chinese People's Libration Army, Tianjin 300042, China3.China Aero Geophysical Survey and Remote Sensing Center for Land and Resource, Beijing 100083, China;School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China |
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| Abstract: | The existing methods of downward continuation of potential fields connot be used to continue the aeromagnetic data to the sea level because of the limited continuation depth.An iteration method for downward continuation of potential fields with a larger continuation depth has been developed,which can continue the aeromagnetic data to the sea level and get the sea-magnetic chart with the same scale as the aeromagnetic data.This downward continuation method will greatly raise the efficiency of sea-magnetic investigation.The principle of the iteration method is presented and a real case with a discussion on error of continuation is given.The effects of downward continuation of potential fields are compared using the iteration method and the fast Fourier transform(FFT) respectively,the former is much better than the latter. |
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| Keywords: | aeromagnetic sea-magnetic downward continuation of potential field iteration method fast Fourier transform |
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