Research On The Key Technologies Of Multi-objective 6-DOF Electromagnetic Positioning

Six degree of freedom(6-DOF)electromagnetic positioning technology texts the magnetic induction intensity through receiving sensor,computes the position and orientation parameters of the target.The process is fast,not affected by non-metallic objects cover and the results are precise.The 6-DOF electromagnetic positioning has great application in virtual reality,individual combat,fighter auxiliary aiming,pipeline robot,etc.Research on the signal extraction method and signal processing method,the key technologies of 6-DOF electromagnetic positioning,can increase target quantity,device accuracy and portability,have important theoretical and practical value.In this paper,we discuss the signal processing method,implementation approach,and other related technologies of AC 6-DOF electromagnetic positioning system,the main contents of this paper are as follows:(1)We review the 6-DOF electromagnetic positioning principles,contain the multi-objective positioning implementation approach based on time division multiplexing(TDM),the magnetic field calculation model and received signal model of AC 6-DOF electromagnetic positioning system,at last we discuss the 6-DOF parameters analytical algorithm.We research on the signal processing method of multi-objective 6-DOF electromagnetic positioning system,use TDM processing multi-channel signal,increase target quantity,use the signal extraction method of 6-DOF electromagnetic positioning system based on all-phase correction,reduce effect from frequency deviation in amplitude parameter estimation,improve positioning precision.(2)We design received signal circuit unit of multi-objective positioning system,contain two levels of TDM circuit,amplifying circuit,gain control circuit.Research on the method of automatic gain control(AGC),determine amplification by comparing distance,and determine the AGC system thresholds by testing received signal attenuation.Design the software program of double-objective 6-DOF electromagnetic positioning device,realization time-division control,gain control,signal acquisition,signal extraction,6-DOF parameters calculation,host computer communication and other functions.(3)We design double-objective 6-DOF electromagnetic positioning device test platform,test positioning speed and positioning accuracy,evaluate the device performance,analysis the error sources and their respective proportion,verify the feasibility of multi-objective 6-DOF electromagnetic positioning implementation approach we proposed.Experimental results show that the device position accuracy up to millimeter scales and orientation can be accurate to about 2 degrees in the case of close range.The innovative works are as follows:(1)A novel signal extraction method based on all-phase correction is proposed to reduce error from frequency deviation and improve 6-DOF electromagnetic positioning precision.Simplified algorithm by adopting the orthogonality and periodicity of emission signal,reduce the dimension of matrix that compute the amplitude parameter.(2)We proposed a signal processing method apply to multi-objective 6-DOF electromagnetic positioning device,which contain receiving signal receive,amplify,sample and parameters extraction method and implementation approach.In received signal circuit unit,realization multi-channel signal receive by TDM,increase device target quantity;Apply AGC technologies increase the stability of amplifying circuit output signal.In this paper,we systematic researched on the key technologies of signal processing method and implementation approach of multi-objective 6-DOF electromagnetic.The researches have certain reference value in develop positioning device which have independent intellectual property rights.