Electromagnetic Field Of Moving Body Under Background Magnetic Field

As a passive, autonomic, radiation-free, round-the-clock and no long-term error accumulation way of navigation method, geomagnetic navigation technology is becoming more and more noticeable among scholars.Building a geomagnetic navigation database is the key to realize geomagnetic navigation. Different from traditional geomagnetic navigation databases, this paper pays extra attention to abstract carrier models which contain current region( conductor), permanent magnet or soft magnet and the different distribution of magnetic field under differentl background magnetic fields. Thus, presents the method to build a geomagnetic navigation database including interference factors. This paper researches the electromagnetic field issues of motive carriers under different background magnetic fields and provides key theoretical supports and technique methods for building new geomagnetic navigation databases through numerical analysis.The main research work of this paper are as follows:(1) Build the mathematical model of carriers under constant background magnetic field and sinusoidal background magnetic field when it’s static, obtain the matrix equation of these two consequences using weighted residual method, and respectively simulate the magnetic field distribution of static carriers under no background magnetic field, constant background magnetic field and sinusoidal background magnetic field using finite element analysis software.(2) Build the magnetic-motion coupling mathematical model of the carrier under constant background magnetic field along x, y and z axis. Obtain the matrix equation of the carrier along x, y and z axis respectively using weighted residual principles and obtain the magnetic field distribution of the carrier at different rate under constant background magnetic field using multi physics field coupling software.(3) Build the magnetic-motion coupling mathematical model of the motive carrier under changing background magnetic fields. Obtain the asymmetric matrix of A?? using weighted residual principles and simulate the magnetic field distribution of the carrier’s motion under sinusoidal changing magnetic field and complex background magnetic field. Thus, obtain the relationship between the change of the magnetic field intensity of internal inspection point and the change of the movement rate of the carrier and time.(4) Provide the scheme of the application methods of geomagnetic navigation databases, take several discrete points in space to collect and save the geomagnetic data to build the discrete geomagnetic navigation database. Meanwhile, compare to the measured(5)value inside the carrier and obtain the spatial position of the motive carrier and the method to realize geomagnetic navigation.