New-concept Navigation And Localization Based On The Spatial Information Of Geomagnetic And Artificial Magnetic Fields

In the past century,enormous research has been done focusing on animals'cross-continental navigation and migration.However,it's still a puzzle that attracts attentions of researchers from different fields.As the developments of GNSS and GSM keep changing humans' way of life,certain drawbacks of these navigation systems limited their usages in some special situations like electromagnetic silent environment where RF signal can't be accessed,small area localization where high precision is demanded,indoor circumstance where reflection and scattering of RF signal make RF-based system can hardly perform its excellent accuracy.In this work,we start the research by exploring the nature cues used in animals'migration,with the aid of mathematics modeling and simulation technique,a navigation system based on geomagnetic field is proposed.With designed a 2D gradient-decent algorithm,cross-continental navigation can be achieved with known geomagnetic parameters of destination.Compared with animals' navigation behaviors and characteristic,method can not only explain conclusions of animal researches,but also give reasonable understanding for some conflict results.This hypothesis provides a promising prototype for animals' migration mechanism.Besides,a navigation system for situations like electromagnetic silent environment is designed and verified through this work.As we known,geomagnetic field can be seen as a magnetic field produced by an enormous magnet whose axis has a small angle with Earth's rotary axis,which builds a gradient-variation magnetic field on the Earth surface.In this work,magnet is used to build a geomagnetic-field-like artificial magnetic field in certain area,navigation experiments are designed in this area with designed magnetic navigation system.Experimental results indicate the reliability of proposed navigation algorithm and system,implying a promising prospect in autonomous mechanical arms,desktop navigation robot and other applications.Wireless indoor positioning systems based on ultrasonic sound,light communication and electromagnetic field have unavoidable interferences like reflections,scattering and sight-of-light problem.However,low frequency alternating magnetic field has excellent performance under indoor environment due to its long wave length and capability of penetration.For wave of such wave length,the walls can be seen as thin layer,furniture can also be seen as Rayleigh scatters,all of which have no decay to it.So,alternating magnetic field has plenty of advantages over other methods.And its low power consumption makes it a precision,economic and easy-to-use indoor positioning choice.In this work,a cross-continental navigation algorithm and system are proposed and realized,a precision section navigation system and wireless indoor navigation system based on artificial magnetic field are designed,all of which show bright prospects in future applications.