| 高精度磁测正常场改正和高度改正精度 |
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| 引用本文： | 简燕,李文尧,武中华.高精度磁测正常场改正和高度改正精度[J].物探与化探,2011,35(3):368-370,387. |
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| 作者姓名： | 简燕 李文尧 武中华 |
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| 作者单位： | 昆明理工大学,国土资源工程学院,云南,昆明,650093 |
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| 摘 要： | 地球磁场强度存在沿纬度方向和高度方向上的变化,在开展高精度磁测工作时,必须进行高度改正和正常场改正。目前普遍使用的改正方法是根据高斯球谐表达式的13级近似式、十级近似式以及一级近似式进行改正的。经计算发现,与高斯球谐表达式的13级近似式相比,当测点与基点的南北方向距离为30 km时,使用十级近似式计算的正常场改正误差为-0.21 nT;使用一级近似式计算的正常场改正的误差随测点与基点的南北方向距离增大而增大,当测点与基点的南北方向的距离大于4 km时,正常场改正误差大于1 nT;使用一级近似式计算的高度改正的误差随测点与基点高度差增大而增大,当测点与基点高度差大于300 m时,误差大于1 nT。
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| 关 键 词： | 高精度磁测 高度改正 纬度改正 改正精度 |
A DISCUSSION ON NORMAL FIELD CORRECTION AND ALTITUDE CORRECTION OF HIGH-PRECISION MAGNATIC SURVEY |
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| JIAN Yan,LI Wen-yao,WU Zhong-hua.A DISCUSSION ON NORMAL FIELD CORRECTION AND ALTITUDE CORRECTION OF HIGH-PRECISION MAGNATIC SURVEY[J].Geophysical and Geochemical Exploration,2011,35(3):368-370,387. |
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| Authors: | JIAN Yan LI Wen-yao WU Zhong-hua |
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| Institution: | JIAN Yan,LI Wen-yao,WU Zhong-hua(Faculty of Land and Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China) |
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| Abstract: | here exists change of gradient for earth magnetic intensity in directions of altitude and latitude,and hence it is needed to carry out altitude correction and altitude correction during the performance of high-precision magnetic survey.The common method for calculating correction values is based on the thirteen-stage approximate formula of the spherical harmonics expression,and there also exist the ten-stage one and the one-stage one.There commonly exists a small error in using the ten-stage one.In comparis... |
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| Keywords: | high-precision magnetic survey altitude correction latitude correction correction accuracy |
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