A Spherical Cap Harmonic Model of the Crustal Magnetic Anomaly Field in Europe Observed by Magsat

1989 ◽  
pp. 1-17 ◽  
Author(s):  
A. Santis ◽  
D. J. Kerridge ◽  
D. R. Barraclough
Keyword(s):  
Magnetic Anomaly ◽  
Harmonic Model ◽  
Spherical Cap ◽  
Anomaly Field ◽  
Crustal Magnetic Anomaly ◽  
Spherical Cap Harmonic Model

scholarly journals A Spherical Cap Harmonic Model of the Satellite Magnetic Anomaly Field Over China and Adjacent Areas.

1992 ◽  
Vol 44 (3) ◽  
pp. 243-252 ◽  
Author(s):  
Zhen-chang AN ◽  
Shi-zhuang MA ◽  
Dong-hai TAN ◽  
D. R. BARRACLOUGH ◽  
D. J. KERRIDGE
Keyword(s):  
Magnetic Anomaly ◽  
Harmonic Model ◽  
Spherical Cap ◽  
Anomaly Field ◽  
Spherical Cap Harmonic Model

Spherical cap harmonic model for mapping and predicting regional TEC

GPS Solutions ◽  
2010 ◽  
Vol 15 (2) ◽  
pp. 109-119 ◽  
Author(s):  
Jingbin Liu ◽  
Ruizhi Chen ◽  
Zemin Wang ◽  
Hongping Zhang
Keyword(s):  
Harmonic Model ◽  
Spherical Cap ◽  
Spherical Cap Harmonic Model

A Preliminary Study on Mapping the Regional Ionospheric TEC Using a Spherical Cap Harmonic Model in High Latitudes and the Arctic Region

2010 ◽  
Vol 9 (1) ◽  
pp. 22-32 ◽  
Author(s):  
Jingbin Liu ◽  
Ruizhi Chen ◽  
Heidi Kuusniemi ◽  
Zemin Wang ◽  
Hongping Zhang ◽  
...  
Keyword(s):  
Arctic Region ◽  
The Arctic ◽  
High Latitudes ◽  
Harmonic Model ◽  
Spherical Cap ◽  
Preliminary Study ◽  
Spherical Cap Harmonic Model ◽  
The Arctic Region

Local Quasi-Geoid Refinement Based on Spherical Cap Harmonic Model

2012 ◽  
Vol 226-228 ◽  
pp. 1947-1950 ◽  
Author(s):  
Jin Yun Guo ◽  
Shu Yang Wang ◽  
Guo Wei Li ◽  
Wei Hua Mao ◽  
Yuan Ming Ji
Keyword(s):  
Height Anomaly ◽  
Practical Case ◽  
Harmonic Model ◽  
Geoid Model ◽  
Normal Height ◽  
Spherical Cap ◽  
Geodetic Height ◽  
Gps Leveling ◽  
Spherical Cap Harmonic Model ◽  
Selection Of

The local quasi-geoid model up to centimeter precision has became the basic requirement for the development of modern surveying and mapping science. There are a variety of models can be used for the quasi-geoid refinement, including the spherical cap harmonic model (SCH). This paper studies the theory of SCH to get the spherical cap harmonic expression to fit the height anomaly in the least squares sense, which is to achieve the transformation between the geodetic height and the normal height. We also discuss the selection of the maximum model degree in local region. The practical case is studied to refine the local quasi-geoid model with SCH using GPS/leveling data at 85 points. The results indicate that the local quasi-geoid model can reach 3 centimeter-level at the internal and external fitting precision.

A Calculation Method of Magnetic Anomaly Field Distribution of Ellipsoid with Arbitrary Posture

2021 ◽  
Author(s):  
Song-tong Han ◽  
Bo Zhang ◽  
Xiao-li Rong ◽  
Lei-xiang Bian ◽  
Guo-kai Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Magnetic Anomaly ◽  
Field Distribution ◽  
Calculation Method ◽  
Gravity Potential ◽  
Anomaly Field ◽  
Finite Element Software ◽  
Wide Range ◽  
Distribution Equation

The ellipsoidal magnetization model has a wide range of application scenarios. For example, in aviation magnetic field prospecting, mineral prospecting, seabed prospecting, and UXO (unexploded ordnance) detection. However, because the existing ellipsoid magnetization formula is relatively complicated, the detection model is usually replaced by a dipole. Such a model increases the error probability and poses a significant challenge for subsequent imaging and pattern recognition. Based on the distribution of ellipsoid gravity potential and magnetic potential, the magnetic anomaly field distribution equation generated by the ellipsoid is deduced by changing the aspect ratio, making the ellipsoid equivalent to a sphere. The result of formula derivation shows that the two magnetic anomaly fields are consistent. This paper uses COMSOL finite element software to model UXO, ellipsoids, and spheres and analyzes magnetic anomalies. The conclusion shows that the ellipsoid model can completely replace the UXO model when the error range of 1nT is satisfied. Finally, we established two sets of ellipsoids and calculated the magnetic anomalous field distributions on different planes using deduction formulas and finite element software. We compared the experimental results and found that the relative error of the two sets of data was within [Formula: see text]‰. Error analysis found that the error distribution is standardized and conforms to the normal distribution. The above mathematical analysis and finite element simulation prove that the calculation method is simple and reliable and provides a magnetic field distribution equation for subsequent UXO inversion.

Maps of the magnetic anomaly field at Earth's surface from scalar satellite data

1996 ◽  
Vol 23 (1) ◽  
pp. 41-44 ◽  
Author(s):  
R. A. Langel ◽  
K. A. Whaler
Keyword(s):  
Magnetic Anomaly ◽  
Satellite Data ◽  
Anomaly Field
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