The Numerical Analysis Of Aircraft Magnetic Interference Inthe Environment Of Consmagnetic Field

Magnetic field is the basic physics field of earth, it is characteristic of all-day, all-weather, all regional, and has abundant parameter information, can provide sufficient information for geomagnetic matching navigation. In modern society, as the development of science and technology, geomagnetic navigation technology will have a fundamental change. In the early 1990s, The American Cornell university proposed the concept that the satellite orbit can be determined using of magnetic field firstly, since then the geomagnetic navigation has became a new research direction of spacecraft navigation.With the breakthrough of the problem that carrier magnetic field interference in the measurement of geomagnetic field and the high density and precision found of geomagnetic model and geomagnetic figure, it is possible to establish global navigation system based on the geomagnetic field measurement.Geomagnetic navigation need match with the timely measurements of magnetic field strength and geomagnetic field model .Because of the existence of eddy current magnetic field and inductive magnetic field in the flying ,the routes of movement is often curve in the practical movement of aircraft, and there exists certain angle and frequency rotation around the three coordinates of aircraft. That is the projection axis of geomagnetic field vector changes continuous in the aircraft coordinate system. Therefore, the magnetic interference is very complex when the aircraft moving in geomagnetic field. In order to solve easily, magnetic interference is classified into excitation eddy current magnetic interference, sports cutting generated eddy current magnetic interference and inductive magnetic interference, and the three parts consider respectively. In the numerical calculation of the two latter magnetic interference, we use aircraft coordinate system and hypothesis the geomagnetic field vector unchanged in the inner earth coordinate system and distributed uniformly in space. In this paper, we have analyzed the distribution and change rule of induction magnetic interference and eddy current magnetic interference combining with specific conditions respectively, and established the finite element models, the results provides the theoretical foundation for geomagnetic navigation.