| 基于海空磁力测量数据的向下延拓方法比较 |
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| 引用本文： | 刘强,崔大伟,边刚,姚俊杰.基于海空磁力测量数据的向下延拓方法比较[J].海洋测绘,2021,41(2):12-16. |
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| 作者姓名： | 刘强 崔大伟 边刚 姚俊杰 |
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| 作者单位： | 92150部队,浙江舟山316000;海军大连舰艇学院军事海洋与测绘系,辽宁大连116018 |
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| 摘 要： | 地磁场的向下延拓是实现磁场数据空间转换的主要手段,是多源海洋磁力测量数据融合和构建三维海洋磁空间背景场模型的关键技术。在分析频域位场向下延拓方法原理基础上,分别采用了4种向下延拓方法将300 m高度磁测数据延拓至200 m高度,并与同一海区200 m高度实测数据对比,以检验各延拓方法的计算效果,为构建三维海洋磁空间背景场模型提供参考。结果表明:Tikhonov正则化法延拓结果与实测数据最接近,积分迭代法容易放大实测数据中高频噪声,延拓误差最大,迭代Tikhonov正则化法与Landweber迭代法延拓结果等值线最光滑,各方法计算误差相差不大,均在4 nT左右,但各方法计算值缺乏局部细节信息,与实测数据仍存在一定差距。
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| 关 键 词： | 海空磁力测量 频域位场 向下延拓 正则化方法 扩边处理 |
A comparison of downward continuation methods based on marine aeromagnetic survey data |
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| LIU Qiang,CUI Dawei,BIAN Gang,YAO Junjie.A comparison of downward continuation methods based on marine aeromagnetic survey data[J].Hydrographic Surveying and Charting,2021,41(2):12-16. |
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| Authors: | LIU Qiang CUI Dawei BIAN Gang YAO Junjie |
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| Institution: | 92150 Troops,Zhoushan 316000 ,China;Department of Military Oceanography and Hydrographic,Dalian Naval Academy,Dalian 116018 ,China |
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| Abstract: | The downward continuation of geomagnetic field is the main means to realize the spatial transformation of magnetic field data,and is the key technology of multi-source marine magnetic survey data fusion and the construction of three-dimensional marine magnetic field model.On the basis of analyzing the principle of downward continuation method of frequency domain potential field,four downward continuation methods are used to extend magnetic survey data from 300m height to 200m height,and compared with the measured data from 200m height in the same sea area, so as to test the calculation effect of each continuation methd and provide reference for the construction of 3D marine magnetic field model.The results show that the continuation result of Tikhonov regularization method is closest to the measured data,the integral iteration method is easy to amplify the high frequency noise in the measured data,and the calculation error is the largest,and the results of iterative Tikhonov regularization method and Landweber iteration method are the smoothest.The calculation errors of each method are about 4nT,but the downward continuation results of each method are lack of local details,there are still some gaps in the measured data. |
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