Research On Leveling Of Full Tensor Magnetic Gradient Data

The development trend of aeromagnetic survey technology is from total magnetic field scalar survey,vector field survey to full tensor magnetic gradient survey.The processing of full tensor magnetic gradient data is one of the frontier topics of current magnetic exploration.In the process of aeromagnetic survey,due to a series of influencing factors such as the flight state of UAV,the working state of magnetic measuring instrument and the superposition of regional magnetic field,a series of strip anomalies along the direction of the survey line will often appear in the magnetic anomaly contour map,which will seriously affect the data quality and subsequent data processing and interpretation.Therefore,it is necessary to strip the measured aeromagnetic data,which is called the leveling of aeromagnetic data.At present,there are many leveling methods for the total aeromagnetic field data,such as micro-leveling and cutting line leveling,but there are few leveling method for the full tensor magnetic gradient data.In this paper,the leveling method of full tensor magnetic gradient data is studied,mainly including the following parts:1.Investigated micro-leveling,cutting line leveling,non-cutting line leveling methods and other common leveling methods,and summarized the advantages and disadvantages of each method and its applicable conditions.2.Based on the principle of Naudy filtering and interpolation cutting,the micro-leveling of the total aeromagnetic field is realized,and the feasibility of the method is verified by theoretical model and actual data.3.The leveling error distribution method for the full tensor magnetic gradient data is designed to make the leveled full tensor magnetic gradient matrix satisfy the Laplace equation.Finally,the theoretical model and measured data are used to verify the feasibility of the full tensor magnetic gradient leveling method.