Simulation on the Qualitative Relationship Between Carrier Movement and Eddy Current Interfering Magnetic Field in Geomagnetic Navigation

Abstract

The premise of using geomagnetic measurement to realize high precision navigation is that magnetometer can obtain geomagnetic field data accurately. However, the moving carriers, including missiles and aircraft, whose attitudes will continue to change during the flight and eddy current magnetic field generated by carrier moving also changes. Therefore, it is of great significance to study the intrinsic relationship between them to eliminate the influence of eddy current magnetic field. In this paper, COMSOL Multiphysics was used to establish the model of eddy current magnetic field, and it was studied that the influence of carrier on geomagnetic measurement under different motion conditions. Firstly, the influence of the characteristics of the permanent magnet on the uniform magnetic field is analyzed. Secondly, the distribution of the carrier’s eddy current magnetic field under the rotation condition is studied. Finally, the relationship is considered between the eddy current field and the carrier speed under the condition of swing. The simulation results clarify the relationship between eddy magnetic field and the carrier movement mode. At the same time, it provides an important theoretical basis for the geomagnetic measurement error compensation algorithm.