The Study On Measurement Error Correction Of The Orthogonal Magnetic Loop Antenna For Lightning-Direction Finding

Lightning is a complex natural phenomenon,and its process is usually accompanied by strong signal radiation such as sound,light and electricity.Thus it poses a threat to human social activities,life safety,etc.Lightning disasters are one of the most serious natural disasters,and the threat of lightning can be effectively reduced by monitoring lightning and quickly determining the location of lightning.Therefore,research on lightning detection technology is becoming more and more important.In this paper,the Angle Measurement Error(AME)correction method for the Orthogonal Magnetic Loop Antenna(OMLA)is proposed.The optimization effect is verified by experiments.Finally,by analyzing the positioning principle of single-station lightning location system,the optimization effect of the correction method on single station lightning location is analyzed theoretically.The full text is as follows:(1)Firstly,the research background and significance of lightning detection technology are introduced,and the development trend and current situation of research technology at home and abroad are emphasized.(2)The discharge process of lightning cloud flash(CF)and ground flash(GF)is introduced.Then according to the discharge principle,introduces the current mainstream lightning detection method,mainly including Magnetic Direction Finding(MDF),time of arrival(TOA),IMPACT and interference Finding(ITF).Finally,the detection error of lightning detector based on OMLA is analyzed.The AME caused by the processing error of OMLA is proposed.(3)The measurement accuracy for lightning direction finding by OMLA is continuously improved,which results in the AME caused by the OMLA machining error increasing.The source and influence of the AME are analyzed.And a theoretical model is established for the relationship between the machining error and AME of OMLA.With the compensation coefficient and equivalent non-orthogonal angle error.On this basis,a AME correction method for OMLA is proposed.The AME of the conventional measurement way and the corrected measurement way are compared through three groups of data experimentally.The experimental results show that the AME by the corrected measurement way is significantly reduced by about 50%.Therefore,this correction method can help the OMLA with the same hardware condition to obtain higher measurement accuracy for lightning direction finding.(4)The advantages and disadvantages of multi-station lightning location system and single-station lightning location system(SLLS)are analyzed.Introduced the distance method used in SLLS.The influence of angle measurement error on the location error of SLLS is studied.The trend of angle measurement error under the condition of 500 km from lightning place and 0-10 km distance error is analyzed.The optimization effect of the AME correction method of OMLA on the positioning accuracy of the single station positioning system is verified by the theoretical analysis and the existing experimental data.The data results show that under certain fixed distance error,the correction method can achieve the effect of positioning error by nearly 25%,and the standard deviation of the positioning error is reduced to 0.671.