Research on Gridding Precision Evaluation Method of Geomagnetic Field Model
With the in-depth research on geomagnetic field model and geomagnetic navigation, the appropriate method of precision evaluation of the geomagnetic field model is required. WMM model and INTERMAGNET observations data are used to research the precision of
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Abstract With the in-depth research on geomagnetic field model and geomagnetic navigation, the appropriate method of precision evaluation of the geomagnetic field model is required. WMM model and INTERMAGNET observations data are used to research the precision of the latest WMM2015 model in the world, and analyze the accuracy of different local areas, such as Europe, North America, and China. According to the relationship between truncation order of spherical harmonic coefficients of geomagnetic field model and wavelength of spatial resolution, gridding method is proposed to evaluate the geomagnetic field model. The precision analysis of WMM2015 model in the global and local area is provided for the reference of obtaining the more-refined geomagnetic map in geomagnetic navigation matching.
Keywords Geomagnetic field model Geomagnetic navigation WMM2015 Truncation order Gridding
Observation
1 Introduction Geomagnetic field, same as gravity field, is basic physical field of the earth. The earth’s magnetic field is a vector quantity varying in time and space. Geomagnetic field model is an approximation of the geomagnetic field using a mathematical Y. Chong (&) H. Chai Y. Chang Z. Pan H. Wang Institute of Geospatial Information, Information Engineering University, Zhengzhou 450001, China e-mail: [email protected] Y. Chong Y. Chang State Key Laboratory of Geo-Information Engineering, Xi’an, China Y. Chong Department of Navigation, Naval University of Engineering, Wuhan, China Y. Liu 72515 Troops, Jinan, China © Springer Science+Business Media Singapore 2016 J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2016 Proceedings: Volume II, Lecture Notes in Electrical Engineering 389, DOI 10.1007/978-981-10-0937-2_48
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method. It plays an important role on understanding the earth’s interior structure, the activities of ionosphere, geomagnetic navigation and orientation, etc. [1–3]. The World Magnetic Model is internationally recognized as the main field of reference model, which is a joint product of the United States’ National GeospatialIntelligence Agency and the United Kingdom’s Defence Geographic Centre, that launches a new model every 5 years. The WMM is the standard model used by the U.S. Department of Defense, the U.K. Ministry of Defence, the North Atlantic Treaty Organization, and the International Hydrographic Organization, for navigation and attitude referencing systems. It is also used widely in civilian navigation and heading systems. Irregular changes in the Earth’s core field limit the lifetime of any predictive model such as the WMM. For this reason a revision (WMM2015) was released in December 2014. Effective age for this revision model is as of January 1, 2015 to December 31, 2019 and its data mainly comes from Swarm, Orested, and CHAMP magnetic survey satellites. In WMM2015 technical report, the requirement is that the global RMS difference between the WMM and the observed magnetic field at sea level should be within 1° for D and I, within 14
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